Revision of Rhizoglyphus Claparède (Acari: Acaridae) of Australasia and Oceania
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1 Revision of Rhizoglyphus Claparède (Acari: Acaridae) of Australasia and Oceania QING-HAI FAN* & ZHI-QIANG ZHANG Landcare Research, Private Bag 92170, Auckland, New Zealand *Fujian Agricultural and Forestry University, Fuzhou , China Systematic & Applied Acarology Society, London 2004
2 QING-HAI FAN & ZHI-QIANG ZHANG Revision of Rhizoglyphus Claparède (Acari: Acaridae) of Australasia and Oceania First published on 31 January 2004 by Systematic & Applied Acarology Society c/o Department of Entomology The Natural History Museum London SW7 5BD UK All rights reserved ISBN
3 Table of contents Abstract...4 Introduction...6 Materials and methods...7 Genus Rhizoglyphus Claparède, Key to stages of Rhizoglyphus Claparède...15 Key to adult females of Australasian Rhizoglyphus Claparède...16 Key to adult males of Australasian Rhizoglyphus Claparède...18 Rhizoglyphus caladii Manson, 1972 (Figs. 1 14)...21 Rhizoglyphus columbianus Oudemans, 1924 (Figs )...43 Rhizoglyphus echinopus (Fumouze & Robin, 1868) (Figs )...74 Rhizoglyphus howensis Manson, 1972 (Figs ) Rhizoglyphus minutus Manson, 1972 (Figs ) Rhizoglyphus ogdeni Fan & Zhang, sp. n. (Figs ) Rhizoglyphus ranunculi Manson, 1972 (Figs ) Rhizoglyphus robini Claparède, 1869 (Figs ) Rhizoglyphus setosus Manson, 1972 (Figs ) Rhizoglyphus singularis Manson, 1972 (Figs ) Rhizoglyphus tokelau Fan & Zhang, sp. n. (Figs ) Acknowledgements References Index Appendix 1: List of Rhizoglyphus species by hosts Appendix 2: List of Rhizoglyphus species by distribution...373
4 4 FAN & ZHANG (2004) Abstract Mites of the genus Rhizoglyphus (Acari: Acaridae) are commonly associated with the underground storage organs such as bulbs and corms of many plants. Some species can cause damage to crops and ornamental plants, both in greenhouses and in the field. They are also important in biosecurity and trade because they are frequently found in exported/imported horticultural products such as carrots, corms of taro and flower bulbs. In this revision, we examined more than 1840 Rhizoglyphus mite specimens of different stages mainly from Australasia and Oceania. Fifty nine stages of 11 species are described: R. caladii Manson (adult female, adult homeomorphic male, tritonymph, larva), R. columbianus Oudemans (adult female, adult homeomorphic male, tritonymph, protonymph, larva), R. echinopus (Fumouze & Robin) (adult female, adult homeomorphic male, tritonymph, protonymph, larva), R. howensis Manson (adult female, adult homeomorphic male, protonymph), R. minutus Manson (adult female, adult homeomorphic male, tritonymph, deutonymph, protonymph, larva), R. ogdeni sp. n. (adult female, adult homeomorphic male, tritonymph), R. ranunculi Manson (adult female, adult homeomorphic male, tritonymph), R. robini Claparède (adult female, adult homeomorphic male, adult heteromorphic male, tritonymph, deutonymph, protonymph, larva), R. setosus Manson (adult female, adult homeomorphic male, adult heteromorphic male, tritonymph, deutonymph, protonymph, larva), R. singularis Manson (adult female, adult homeomorphic male, adult heteromorphic male, tritonymph, protonymph) and R. tokelau sp. n. (adult female, adult homeomorphic male). Rhizoglyphus longispinosus Ho & Chen, 2001 is
5 REVISION OF RHIZOGLYPHUS 5 considered as a junior synonym of R. caladii Manson, 1972; R. tacitri Manson, 1972 a junior synonym of R. columbianus Oudemans, 1924; and R. tsutienensis Ho & Chen, 2000 a junior synonym of R. singularis Manson, Keys to adult females and males of Rhizoglyphus of Australasia and Oceania are provided. Lists of hosts and distributions of these species are also provided. Key words: Acari, Acaridae, Rhizoglyphus, bulb mites, review, new species, new synonyms, host plants, distribution
6 6 FAN & ZHANG (2004) Introduction Mites of the genus Rhizoglyphus (Acari: Acaridae) are commonly associated with the underground storage organs such as bulbs and corms of many plants. Some species are cosmopolitan and can cause damage to crops and ornamental plants, both in greenhouses and in the field (Diaz et al. 2000). Because of the pest status of some species, mites of this genus are generally considered undesirable and are classified as quarantine species by many countries such as New Zealand and Australia. This taxonomic revision of Australasian and Oceania Rhizoglyphus was initiated due to the quarantine importance of these mites in the region. Rhizoglyphus mites are frequently intercepted by New Zealand and Australian biosecurity officers in horticultural products such as carrots, corms of taro and flower bulbs. Due to the unresolved state of the taxonomy of this genus, rapid and accurate identification of intercepted species is difficult. As a result, intercepted specimens were determined to the genus level and the shipments were fumigated, which added costs to exports and reduced the quality of produce, as well as causing environmental and human health concerns. The importance of taxonomy to biosecurity and trade was recognized by the New Zealand Biosecurity Authority of Ministry of Agriculture and Forestry, and Plant Protection Service of the Secretariat of the Pacific Community, who funded this project. The primary objective of this paper is to revise all Rhizoglyphus species in the region and provide keys, descriptions and illustrations to facilitate the rapid and accurate identification of all species. In addition, other data of biosecurity importance (e.g. host plants and distribution) are also provided.
7 REVISION OF RHIZOGLYPHUS 7 Materials and methods More than 1840 mites including 872 adult females, 417 adult homeomorphic males, 54 adult heteromorphic males, 240 tritonymphs, 48 deutonymphs, 96 protonymphs and 113 larvae mounted in 603 slides were studied using an interference-phase contrast microscope. They are from the following collections: New Zealand Arthropod Collection in Landcare Research, Auckland, New Zealand (NZAC); the National Plant Pest Reference Laboratory, Ministry of Agriculture and Forestry in Lincoln and Auckland, New Zealand (NPPRL); Agricultural Scientific Collections Unit, Orange Agricultural Institute, NSW Agriculture, Orange NSW, Australia (ASCU); Australian Quarantine and Inspection Service (AQIS); South Australian Museum, Adelaide, Australia (SAM); Australian National Insect Collection, Canberra, Australia (ANIC); The Natural History Museum, London, UK (BMNH); The Oudemans Collection, The National Museum of Natural History, Leiden, The Netherlands (RMNH); Taiwan Agricultural Research Institute (TAL). Holotype specimens of two new species, R. ogdeni and R. tokelau, are deposited in NPPRL. All measurements were made from slide-mounted specimens using stage-calibrated ocular micrometers. Chelicerae were measured from the basal articulations to the tips of movable digits. Idiosomal lengths were measured from the anterior margins to the posterior margins. Idiosomal widths were measured as the maximum width of the idiosoma between leg II and III. Dorsal body setae were measured from the alveoli to tips. Legs were measured from the bases of trochanters to the tips of claws. Femora of legs were measured from the ventral junction between the trochanter and femur to junction between the femur and genu. Genua were measured from junction between the femur and genu to junction between the genu and tibia.
8 8 FAN & ZHANG (2004) Tibiae were measured from the junction between the genu and tibia to the junction between the tibia and tarsus. Tarsi were measured from the posterior margins to the tips of claws. Setae, spines and solenidia on legs were measured from the alveoli to tips. The number A number B of anal sucker or anal disc means the length width. The L/W of setae or spines is the ratio of their length and basal width. Backslashes in material examined indicate different slides. All measurements are given in micrometers. The terminology of idiosomal chaetotaxy follows Griffiths et al. (1990) and the terminology of palp and leg chaetotaxy follows that of Grandjean (1939) and Griffiths (1970). The terminology of the copulatory organ follows that of Klimov and OConnor (2003). List of abbreviations Ganthosoma cha cheliceral setae elcp supracoxal setae of palp m infracapitular setae Idiosoma vi internal pair of vertical setae ve external pair of vertical setae sci internal pair of scapular setae sce external pair of scapular setae scx supracoxal setae of leg I c 1 innermost (first) pair of setae in first series or row on hysterosoma c 2 c p c 3 d 1 d 2 e 1 second pair of setae in first series or row on hysterosoma third pair of setae in first series or row on hysterosoma fourth pair of setae in first series or row on hysterosoma innermost (first) pair of setae in second series or row on hysterosoma second pair of setae in second series or row on hysterosoma innermost (first) pair of setae in third series or row on hysterosoma
9 REVISION OF RHIZOGLYPHUS 9 e 2 f 2 h 1 h 2 h 3 ia im ip ih gla 1a 3a 3b 4a g ps 1 ps 2 ps 3 ad 1 ad 2 ad 3 second pair of setae in third series or row on hysterosoma setae in fourth series or row on hysterosoma innermost (first) pair of setae in fifth series or row on hysterosoma second pair of setae in fifth series or row on hysterosoma third pair of setae in fifth series or row on hysterosoma anterior pair of cupules (lyrifissures) on dorsal hysterosoma middle pair of cupules (lyrifissures) on dorsal hysterosoma poterior pair of cupules (lyrifissures) on dorsal hysterosoma caudal pair of cupules (lyrifissures) on hysterosoma opisthonotal glands coxal-sternal setae associated with bases of legs I innermost (first) pair of coxal-sternal setae associated with bases of legs III second pair of coxal-sternal setae associated with bases of legs III coxal-sternal setae associated with bases of legs IV genital setae first pair of pseudanal setae second pair of pseudanal setae third pair of pseudanal setae first pair of adanal setae second pair of adanal setae third pair of adanal setae Legs ω 1 proximal solenidion near bases of conical spine (ba) on tarsi I and II ω 2 proximal solenidion on tarsus I ω 3 apical solenidion on tarsus I ε famulus at base of solenidion (ω 1 ) on tarsus I ϕ solenidion on tibia σ' anteriorly-located solenidion on genu I σ" posterior-located solenidion on genu I σ solenidion on genua II and III ba proximal conical spine on tarsi I and II
10 10 FAN & ZHANG (2004) e wa gt ht cg mg vf L/W subterminal dorsal conical spine or seta mid-ventral conical spine or seta anteriorly-located conical spine or seta on tibia posterior-located conical spine or seta on tibia anteriorly-located conical spine or seta on genu posterior-located conical spine or seta on genu ventral seta on femur ratio of length / basal width of spine or seta
11 REVISION OF RHIZOGLYPHUS 11 Genus Rhizoglyphus Claparède, 1869 Rhizoglyphus Claparède, 1869, 18: 445. Rhyzoglyphus Berlese, 1921, 14: Rhisoglyphus Hughes, 1948, 39; Sevastianov & Marroch, 1993, 72(7): 147. (mis-spelt) Diagnosis Adult. Idiosoma saccate, long, whitish to semitransparent. Dorsum with 4 pairs of prodorsal setae and 12 pairs of hysterosomal setae. External vertical setae small or vestigial, situated about halfway along lateral margins of prodorsal shield. Internal scapular setae obviously shorter than external scapular setae, and very small, vestigial or absent in a few species. Supracoxal setae scx smooth, large or small. Grandjean's organ bifurcate or simply bladed. Legs reddish brown. Tarsi I and II each with a proximal conical spine (ba) near bases of solenidion (ω 1 ) and famulus (ε). Tarsus I with 4 long terminal setae and 1 apical solenidion (ω 3 ), tarsus II with 4 long terminal setae, tarsus III with 3 long terminal setae, tarsus IV with 2 long terminal setae in female and 1 long terminal seta in male. Some tarsal setae slightly flattened apically. Description Adult female (Figs. 1 5) Gnathosoma (Fig. 3). Chelicerae chelate, having a small ventral seta (cha) at base of terminal digits. Basal part of palp fused to infracapitulum, bearing a lateral spine-like palpal supracoxal seta (elcp). Terminal part of palp having 2 segments, basal segment bearing 2 simple setae; the other segment bearing 1 simple seta, 1 solenidion and 1 button-like ventral eupathidium. Infracapitulum with a pair of whip-like ventral setae (m). Idiosoma (Figs. 1 2). Prodorsum with a longitudinal rectangular shield, 4 pairs of prodorsal setae (vi, ve, sci and sce), and 1 pair of
12 12 FAN & ZHANG (2004) lateral sclerites. Prodorsal shield punctate, and its posterior margin straight or concave. Internal vertical setae (vi) situated at anterior margin of prodorsal shield, straight or slightly barbed and close to each other. External vertical setae (ve) small or vestigial, situated about halfway along lateral margins of prodorsal shield. Internal scapular setae (sci) situated behind prodorsal shield, small or vestigial, obviously shorter than external scapular setae (sce). Basal part of lateral sclerite with a narrow supracoxal gland opening and terminal part with a bifurcate or bladed Grandjean's organ. Supracoxal setae (scx) smooth, thick or thin, lateral to base of sclerite. Hysterosoma with 12 pairs of setae (c 1, c 2, c p, c 3, d 1, d 2, e 1, e 2, f 2, h 1, h 2 and h 3 ), 4 pairs of lyrifissures (ia, im, ip, and ih) and 1 pair of opisthonotal glands. Setae c p, e 2 and f 2 situated dorsolaterally or ventrolaterally; c 3 small or vestigial, situated ventrolaterally; h 2 situated posteriorly and h 3 situated ventroposteriorly. Lyrifissures ia situated posteriorad of c 2 ; im close to d 2, often in ventral side; ip close to f 2 ; ih in ventral side, lateral to anal opening. Gland opening (gla) posteriorad of d 2. Leg coxae fused with idiosoma, each bounded by a sclerotised apodeme. Left and right apodemes of coxae I fused together along midline. A pair of thin sclerotised sejugal apodemes present between coxae II and coxae III. Coxa I with 1 seta (1a), coxa III with 2 setae (3a and 3b), and coxa IV with 1 seta (4a). Genital opening present between coxae III and IV, with 2 pair of genital papillae covered by genital valves and 1 pair of genital setae (g). Genital folds present. Anal opening posteriorad of genital opening, with 1 6 pairs of setae (ad 3, ps 3, ps 2, ad 2, ps 1 and ad 1 ), ps 3 always present but others may be vestigial or not visible. Copulatory opening posteriorad of anal opening, connecting a small sheild which varies in shape, and leads a thin or progressively broadened spermathecal duct into the sac-like inner part of spermatheca. Base of inner part of spermatheca often sclerotised, at its tips with a pair of Y, V or U -shaped sclerites of oviducts. Legs (Fig. 5). Reddish brown. Tarsi I and II each with a proximal
13 REVISION OF RHIZOGLYPHUS 13 conical spine (ba) near bases of solenidion (ω 1 ). Tarsus I with 4 long terminal setae and 1 long solenidion (ω 3 ), tarsus II with 4 long terminal setae, tarsus III with 3 long terminal setae, tarsus IV with 2 long terminal setae. Chaetotaxy of legs (I IV): coxae 1, 0, 2, 1; trochanters 1, 1, 1, 0; femora 1, 1, 0, 1; genua σ, σ, σ, 0; tibiae ϕ, ϕ, ϕ, ϕ; tarsi 8 c + 4 t + 3 ω + 1ε, 8 c + 4 t + 1 ω, 7 c + 3 t, 8 c + 2 t (c: conical spine, t: long tactile seta). Adult homeomorphic male (Figs. 6 10) Similar to adult female except: genital opening situated between coxae IV; aedeagus present; with 1 pair of anal suckers and 3 pairs of setae (ps 3, ps 2 and ps 1 ), without setae ad 1, ad 2 and ad 3 ; solenidion ϕ on tibia IV conical, spine-like; tarsus IV having 2 suckers. Complement of setae on legs as in adult female except tarsi IV with 7 c + 1 t. Adult heteromorphic male (Figs ) Similar to adult homeomorphic male but both sides or one side of leg III about doubled in size. Body setae slightly longer. Complement of setae on legs as in adult homeomorphic male except tarsi III with 1 enlarged terminal claw, 5 tactile setae and 3 conical spines. Tritonymph (Figs ) Similar to adult female except: genital folds absent; setae around anal opening much shorter (ps 1 and ps 2 may be vestigial or not visible), ad 1, ad 2 and ad 3 often vestigial or not visible. Complement of setae on legs as in adult female. Deutonymph (Figs ) Also known as hypopus. Body highly sclerotised, dorsoventrally flat. Gnathosoma reduced. Chelicerae absent. Idiosomal setae small (except vi and h 2 ). Setae scx situated ventrally. With 2 pairs of genital papillae and 1 pair of genital setae. Ventral hysterosomal area forming an anal attachment organ, which bears 6 pairs of attachment structures (modifies setae). Solenidion σ on genu I absent. Solenidion ω 3 on tarsi I proximal. Seta ba absent. Some of the appical setae on tarsi foliate. Chaetotaxy of legs (I IV): coxae 1, 0, 2, 1; trochanters 1, 1, 1,
14 14 FAN & ZHANG (2004) 0; femora 1, 1, 0, 1; genua σ, σ, σ, 0; tibiae ϕ, ϕ, ϕ, ϕ; tarsi 1 c + 7 t + 3 ω + 1ε, 1 c + 8 t + 1 ω, 8 t, 1 c + 7 t. Protonymph (Figs ) Similar to adult female except: ventral setae 3a and 4a absent; genital folds absent; with 1 pair of genital papillae; with 1 3 pairs of pseudanal setae (ps 1 and ps 2 may be vestigial or not visible), ad 1, ad 2 and ad 3 absent; solenidion ω 3 on tarsi I absent; trochanter IV to tibia IV nude. Chaetotaxy of legs (I IV): coxae 1, 0, 1, 0; trochanters 0, 0, 0, 0; femora 1, 1, 0, 0; genua σ, σ, σ, 0; tibiae ϕ, ϕ, ϕ, 0; tarsi 8 c + 4 t + 2 ω + 1ε, 8 c + 4 t + 1 ω, 7 c + 3 t, 7 c + 1 t. Larva (Figs ) Similar to adult female except: hysterosoma with 10 pairs of setae (f 2 and h 3 absent); ventral setae 3a and 4a absent; without genital opening, genital setae and genital papillae; setae around anal opening absent; with 3 pairs of legs (leg IV absent); with 1 pair of Claparède organs between coxae I II; solenidia ω 2 and ω 3 on tarsi I absent. Chaetotaxy of legs (I III): coxae 0, 0, 0; trochanters 0, 0, 0; femora 1, 1, 0; genua σ, σ, σ; tibiae ϕ, ϕ, ϕ; tarsi 8 c + 4 t + 1 ω + 1ε, 8 c + 4 t + 1 ω, 7 c + 3 t. Remarks Since the description of the first species, Rhizoglyphus echinopus (Fumouze & Robin, 1868), more than 70 species and subspecies have been named (Diaz et al. 2000). The main contributors have been Berlese (1921), Michael (1901, 1903), Oudemans (1924a, 1924b), Zachvatkin (1941), Hughes (1948, 1961, 1976), Nesbitt (1949, 1988, 1993), Eyndhoven (1961, 1963, 1968), Manson (1972) and Fain (1988). The opposing concepts of the two important species (i.e. R. echinopus and R. robini Claparède) among two schools (Zachvatkin, Hughes and followers versus Eyndhoven, Manson and followers) have
15 REVISION OF RHIZOGLYPHUS 15 caused a great deal of confusion. Diaz et al. (2000) provide a comprehensive review of the biology and control of mites of this genus, with a checklist of species and their taxonomic status. Manson (1972) provided an excellent revision of eight species of Rhizoglyphus from New Zealand and a few other countries in the South Pacific. This revision of Australasian and Oceanian Rhizolgyphus builds on the work of Manson (1972). We were able to examine many more specimens from a wider range of localities, including specimens of Oudemans and Hughes. This paper provides a full taxonomic revision of Rhizolgyphus from Australasia and Oceania. Two new species are described and three new synonyms are proposed. Key to stages of Rhizoglyphus Claparède 1. With 4 pairs of legs; hysterosoma with 12 pairs of setae (f 2 and h 3 present) (Fig. 122); Claparède organs absent; genital papillae present (1 or 2 pairs) (Fig. 123) With 3 pairs of legs; hysterosoma with 10 pairs of setae (f 2 and h 3 absent) (Fig. 147); Claparède organs present, located between coxae I II (Fig. 148); genital papillae absent...larva 2. Body saccate (Fig. 122); gnathosoma developed, chelicerae chelate (Fig. 122); ventral hysterosoma without an anal attachment organ; genu I with 2 solenidia (Fig. 126) Body highly sclerotised, dorsoventrally flat (Fig. 139); gnathosoma reduced, chelicerae absent (Fig. 140); ventral hysterosoma with an anal attachment organ (Fig. 140); genu I with only 1 solenidion (Fig. 142)...deutonymph 3. With 2 pairs of genital papillae (Fig. 123); ventral setae 3a and 4a present; solenidion ω 3 on tarsus I present; femur IV and tibia IV not nude (Fig. 126) With 1 pair of genital papillae (Fig. 144); ventral setae 3a and 4a absent; solenidion ω 3 on tarsus I absent; femur IV and tibia IV nude (Fig. 146)... protonymph
16 16 FAN & ZHANG (2004) 4. Genital folds present (Fig. 123); with either spermatheca or aedeagus (Figs. 123, 128)... (adult) 5 - Genital folds absent (Fig. 136); without spermatheca or aedeagus..... tritonymph 5. With aedeagus; without spermatheca; hysterosoma with a pair of anal suckers (Fig. 128); tarsus IV with 2 suckers (Fig. 130) (adult male) 6 - Without aedeagus but with spermatheca (Fig. 123); without anal suckers; tarsus IV without suckers (Fig. 126)...adult female 6. Leg III similar to other legs, tarsal claw normal (Fig. 130)......adult homeomorphic male - Leg III enlarged and with a strong terminal claw (Fig. 134)......adult heteromorphic male Key to adult females of Australasian Rhizoglyphus Claparède 1. Setae sci not close to sce; ratio sci-sci : sci-sce < 2 (Fig. 122) Setae sci very close to sce; ratio sci-sci : sci-sce > 7 (Fig. 109); NEW ZEALAND... R. ranunculi Manson, 1972 (p. 197) 2. Sclerites of oviducts close or moderately separate, distance between them less than 45 µm (Fig. 125); scx slender or minute (Fig. 124) Sclerites of oviducts widely apart, distance between them greater than 75 µm (Fig. 39); scx stout (Fig. 38) Grandjean's organ deeply bifurcate (Fig. 38); scx bifurcate terminally; palpal elcp long, µm; setae e 1 long, nearly as long as distance between e 1 -e 1 ; ratio length : basal width of gt on tibia II = 17 23; WORLDWIDE R. echinopus (Fumouze & Robin, 1868) (p. 74) - Grandjean's organ moderately bifurcate (Fig. 98); scx simple, not bifurcate terminally; elcp short, µm; setae e 1 short, no more than half distance between e 1 -e 1 ; ratio length : basal width of gt on
17 REVISION OF RHIZOGLYPHUS 17 tibia II = 9 11; NEW ZEALAND......R. ogdeni Fan & Zhang, sp. n. (p. 176) 4. With six, four or one pair of setae around anal opening, ps 2 small or vestigial (Fig. 123); spine ba on tarsus I at least two thirds as long as solenidion ω With three pairs of strong setae (> 30 µm) around anal opening, ps 2 the longest (Fig. 2); spine ba on tarsus I small, about half length of solenidion ω 1 ; NEW GUINEA, INDIA / NEPAL, TAIWAN......R. caladii Manson, 1972 (p. 21) 5. Setae ad 1 strong, more than three times as long as ps 3 and more than five times as long as ad 2 (Fig. 203) setae ad 1 often small or vestigial (Fig. 123), if long then whip-like, no more than three times as long as ad 2 (Fig. 152) Setae scx minute or small, < 20 µm (Fig. 17); shield connected with copulatory opening prominent (Fig. 18); AUSTRALIA, COLOMBIA, TAHITI ISLANDS R. columbianus Oudemans, 1924 (p. 43) - Setae scx long and pointed, > 50 µm (Fig. 204); shield connected with copulatory opening undeveloped; TOKELAU ISLAND......R. tokelau Fan & Zhang, sp. n. (p. 347) 7. Setae d 2 far from gla, d 2 -gla > 30 µm (Fig. 122); sclerites of oviducts small, shorter than 12 µm (Fig. 125) Setae d 2 close to gla, d 2 -gla < 15 µm (Fig. 181); sclerites of oviducts prominent, longer than 15 µm (Fig. 184); FIJI, INDIA, INDONESIA, TAIWAN...R. singularis Manson, 1972 (p. 316) 8. Setae ad 1 and ad 2 small or vestigial, shorter than ps 3 ; ps 1 small or vestigial, not longer than ps 3 (Fig. 123) Setae ad 1 and ad 2 longer than three times of length of ps 3 and ad 3 ; ps 1 about 1.5 times as long as ps 3 (Fig. 152); AUSTRALIA, COOK ISLANDS, CUBA, FIJI, HONG KONG, JAPAN, NEW GUINEA, PACIFIC ISLANDS, SAMOA, SINGAPORE,
18 18 FAN & ZHANG (2004) TAIWAN, THAILAND, TONGA, U.S.A R. setosus Manson, 1972 (p. 270) 9. Setae sci more than 10 µm (Fig. 122); bases of h 1 3 slightly expanded, not bulb-like (Fig. 122); with one or six pairs of small setae around anal opening (Fig. 125); copulatory opening simple, tube-like; vi long, about three times as long as tibia I Setae sci vestigial, less than 5 µm (Fig. 70); bases of h 1 3 often expanded, bulb-like (Fig. 70); with four pairs of minute setae around anal opening (Fig. 73); copulatory opening sclerotised and conical (Fig. 73); vi short, about two times as long as tibia I; FIJI, NEW ZEALAND, NIUE ISLAND, SAMOA, TONGA R. minutus Manson, 1972 (p. 129) 10. With six pairs of setae around anal opening (Fig. 125); distance between sclerites of oviducts less than 10 µm (Fig. 125); WORLDWIDE...R. robini Claparède, 1869 (p. 216) - With one pair of setae around anal opening (Fig. 59); distance between sclerites of oviducts about µm (Fig. 59); AUSTRALIA... R. howensis Manson, 1972 (p. 110) Key to adult males of Australasian Rhizoglyphus Claparède 1. Setae sci not close to sce; ratio sci-sci : sci-sce < Setae sci very close to sce; ratio sci-sci : sci-sce > 5 (Fig. 114); NEW ZEALAND...R. ranunculi Manson, 1972 (p. 197) 2. Anal discs small, without radiating lines (Fig. 129) Anal discs large, with radiating lines (Fig. 24) Pseudanal setae ps 1 very long, at least three times as long as ps 2 (Fig. 102); cheliceral setae simply pointed (Fig. 103) Pseudanal setae ps 1 shorter than or as long as ps 2 (Fig. 157); cheliceral setae bifurcate (Fig. 158); AUSTRALIA, COOK ISLAND, CUBA, FIJI, HONG KONG, JAPAN, NEW GUINEA,
19 REVISION OF RHIZOGLYPHUS 19 PACIFIC ISLANDS, SAMOA, SINGAPORE, TAIWAN, THAILAND, TONGA, U.S.A... R. setosus Manson, 1972 (p. 270) 4. Aedeagus broadly truncated (Fig. 43); scx stout (Fig. 43) Aedeagus tapered (Fig. 129); scx slender (Fig. 127); WORLDWIDE...R. robini Claparède, 1869 (p. 216) 5. Grandjean's organ deeply bifurcate (Fig. 43); scx bifurcate terminally; palpal elcp long, µm; ratio sci-sci : sci-sce = ; WORLDWIDE R. echinopus (Fumouze & Robin, 1868) (p. 74) - Grandjean's organ moderately bifurcate (Fig. 103); scx not bifurcate terminally; palpal elcp short, µm; ratio sci-sci : scisce = ; NEW ZEALAND......R. ogdeni Fan & Zhang, sp. n. (p. 176) 6. Pseudanal setae ps 1 very long, at least three times as long as ps 2 (Fig. 187) Pseudanal setae ps 1 as long as or shorter than ps 2 (Fig. 22) Setae d 2 far from gla, d 2 -gla > 24 (Fig. 61) Setae d 2 close to gla, d 2 -gla <15 (Fig. 186); FIJI, INDIA, INDONESIA, TAIWAN...R. singularis Manson, 1972 (p. 316) 8. Setae d 1 less than 1.5 times as long as d 2 ; ratio sci-sci : sci-sce = (Fig. 61); ω 1 on tarsus I short, µm; AUSTRALIA R. howensis Manson, 1972 (p. 110) - Setae d 1 about twice as long as d 2 ; ratio sci-sci : sci-sce = 0.5 (Fig. 206); ω 1 on tarsus I long, µm; TOKELAU ISLAND......R. tokelau Fan & Zhang, sp. n. (p. 347) 9. Setae d 2 far from gla, d 2 -gla > 25 (Fig. 75) Setae d 2 close to gla, d 2 -gla < 15 (Fig. 21); AUSTRALIA, COLOMBIA, TAHITI ISLANDS R. columbianus Oudemans, 1924 (p. 43) 10. Setae sci long, subequal to distance between sci-sci; e 1 ultra long, about twice distance between e 1 -e 1 (Fig. 6); σ' on genu I shorter
20 20 FAN & ZHANG (2004) than σ", ratio σ' : σ" = (Fig. 10); NEW GUINEA, INDIA / NEPAL, TAIWAN...R. caladii Manson, 1972 (p. 21) - Setae sci vestigial, less than one tenth of distance between sci-sci; e 1 about as long as distance between e 1 -e 1 (Fig. 75); σ' on genu I longer than σ", ratio σ' : σ" = 1.3 (Fig. 79); FIJI, NEW ZEALAND, NIUE ISLAND, SAMOA, TONGA R. minutus Manson, 1972 (p. 129)
21 REVISION OF RHIZOGLYPHUS 21 Rhizoglyphus caladii Manson, 1972 (Figs. 1 14) Rhizoglyphus caladii Manson, 1972, 13: 638. Rhizoglyphus longispinosus Ho & Chen, 2001, 43: 47; syn. n. Diagnosis Adult female. Cheliceral setae cha branched terminally. Prodorsal shield evenly punctate. Setae vi thick and pointed, sci about as long as genu I, ratio sci-sci : sci-sce = 1.4 ( ). Grandjean's organ long and bifurcate terminally. Supracoxal setae scx slender and pointed. Setae c ( ) times of length of d 2, c 3 about as long as c 1, d ( ) times of length of d 2, d 2 far from gla, e ( ) times of length of d 2, e ( ) times of length of f 2. Anal opening with 3 pairs of long and strong setae, ps 1 and ps 3 about as long as genu IV, ps 2 more than 1.5 times of length of genu IV; ad 1, ad 2 and ad 3 absent. Copulatory opening ring-shaped, spermathecal duct long and thin, slightly expanded near base of inner part of spermatheca. Base of inner part of spermatheca with a small triangular scleritised structure. Sclerites of oviducts Y-shaped, distance between them 17 (12 17), basal part slightly shorter than branches. Genu I, mg slender, L/W = 12 (9 12), ratio σ' : σ" = 0.7 ( ). Solenidion ω 1 on tarsus I thin and long, slightly broadened at its middle part, 22 (21 22) long. Conical spine ba on tarsi I about 0.5 ( ) times of length of ω 1. Genu II, cg L/W = 7 (4 7), mg slender, L/W = 10 (10 12). Adult homeomorphic male. Setae vi 2.6 ( ) times as long as genu I. Setae c ( ) times of length of d 2, c 3 as long as or slightly longer than c 1, d ( ) times of length of d 2, d 2 far from gla, e ( ) times of length of d 2, e times of length of f 2. Ratio sci-sci : sci-sce = 1.5 ( ). Aedeagus tapered, lumpy internally (Fig. 9). Anal discs with 7 9 radiating lines, its diameter about as long as ps 2. Setae ps ( ) times as long as genu IV,
22 22 FAN & ZHANG (2004) about as long as ps 2; ps 3 thin and pointed. Ratio σ' : σ" = 0.8. Solenidion ϕ on tibia IV one half to two thirds of length of seta kt. Tritonymph. Setae vi 2.2 times as long as genu I. Setae c times of length of d 2, c 3 as long as c 1, d times of length of d 2, d 2 not close to gla, e times of length of d 2, e times of length of f 2. Anal opening with 3 pairs of long setae. Larva. Setae vi 1.2 times as long as genu I. Setae c times of length of d 2, d times of length of d 2, e times of length of d 2. Claparède organ long, its basal part 4.0 times as long as terminal part. Description ADULT FEMALE (Figs. 1 5, n = 4) Gnathosoma. Chelicerae 115 ( ); cha branched, 6 (6 8); palpal elcp 11 (11 14); infracapitular setae m 32 (32 52). Dorsum. Idiosoma 611 ( ) long, 361 ( ) wide. Prodorsal shield 112 ( ) long, evenly punctulate, posterior margin slightly concave, distance between ve-ve 89 (88 92). Setae vi thick and pointed, 92 (92 101) long, 2.9 ( ) times of length of genu I, distance between vi-vi 14 (10 15); ve 5 (5 6). Setae sci obviously long, 39 (39 50), distance between sci-sci 53 (53 66); sce prominently long, 247 ( ), distance between sci-sce 38 (38 42), ratio sci-sci : sci-sce = 1.4 ( ). Grandjean's organ long and bifurcate terminally, 35 (35 39). Supracoxal setae scx slender and pointed, 32 (32 62). Setae c 1 32 (32 42) long, 0.9 ( ) times of length of d 2, distance between c 1 -c ( ); c 2 37 (37 45); c p 215 ( ); c 3 32 (32 47); d 1 43 (43 47) long, 1.2 ( ) times of length of d 2, distance between d 1 -d 1 98 (97 102); d 2 37 (37 44), d 2 far from gla, d 2 -gla 46 (46 57); e ( ) long, 6.7 ( ) times of length of d 2, distance between e 1 -e ( ); e ( ) long, 1.1 ( ) times of length of f 2 ; f ( ); h ( ); h ( ); h ( ).
23 REVISION OF RHIZOGLYPHUS 23 FIGURE 1. Rhizoglyphus caladii Manson (adult female). Dorsal view of idiosoma.
24 24 FAN & ZHANG (2004) FIGURE 2. Rhizoglyphus caladii Manson (adult female). Ventral view of idiosoma.
25 REVISION OF RHIZOGLYPHUS 25 FIGURE 3. Rhizoglyphus caladii Manson (adult female). A, ventral view of chelicera; B, infracapitulum; C, left lateral sclerite and associated structures; D, genital opening.
26 26 FAN & ZHANG (2004) FIGURE 4. Rhizoglyphus caladii Manson (adult female). A, anal opening; B, sclerites of oviducts; C, copulatory opening and spermatheca; D, solenidia, famulus and spine of tarsus I; E, solenidion and spine of tarsus II.
27 REVISION OF RHIZOGLYPHUS 27 FIGURE 5. Rhizoglyphus caladii Manson (adult female). A, leg I; B, leg II; C, leg III; D, leg IV.
28 28 FAN & ZHANG (2004) Venter. Setae 1a 27 (27 40), 3a 17 (17 23), 3b 28 (37 40), g 30 (30 40), 4a 27 (27 32). Anal opening with 3 pairs of long and strong setae; ps 1 32 (32 70) long, 0.8 ( ) times of length of genu IV; ps 2 61 (61 80) long, 1.6 ( ) times of length of genu IV; ps 3 33 (33 57) long, 0.9 ( ) times of length of genu IV; ad 1, ad 2 and ad 3 absent. Copulatory opening ring-shaped. Spermathecal duct thin and long, slightly expanded near base of inner part of spermatheca, 70 (65 70) long. Base of inner part of spermatheca with a small triangular scleritised structure; distance between sclerites of oviducts 17 (12 17). Sclerites of oviducts Y-shaped, basal part slightly shorter than branches, basal part 4 (4 5), branches 6 (5 6). Leg I 225 ( ) long. Femur I 59 (59 72) long, vf whip-like, 70 (68 80). Genu I 32 (32 45), ratio σ' : σ" = 0.7 ( ), σ' 29 (29 37), σ" 43 (40 45), cg slender, 20 (20 25), L/W = 8 (6 8), mg slender, 30 (27 35), L/W = 12 (9 12). Tibia I 33 (33 38) long, solenidion ϕ 162 ( ), gt slender, 17 (17 30), L/W = 8 (7 8), ht 10 (10 15), L/W = 4 (4 5). Tarsus I 90 (90 100) long, 2.7 ( ) times of length of tibia I, ba 11 (11 14), L/W = 3 (2 3), 0.5 ( ) times of length of ω 1, ω 1 thin and long, slightly broadened at its middle part, 22 (21 22), ε 8 (7 8), ω 2 10 (7 10), ω 3 20 (17 22), e 13 (13 16), wa 14 (14 17). Leg II 234 ( ). Femur II 60 (60 75), vf whip-like, 75 (75 97). Genu II 37 (37 45), σ 30 (30 35), cg 17 (16 18), L/W = 7 (4 7), mg slender, 25 (25 27), L/W = 10 (10 12). Tibia II 33 (33 37), ϕ 126 ( ), gt slender, 20 (20 27), L/W = 9 (9 10), ht 10 (10 16), L/ W = 4 (3 4). Tarsus II 92 (92 103), 2.8 ( ) times of length of tibia II, ba 11 (11 16), L/W = 2 (2 3), ω 22 (22 25), e 14 (14 17), wa 15 (15 19). Leg III 222 ( ). Femur III 50 (50 60). Genu III 37 (37 42), σ 25 (22 25), ng 12 (12 18), L/W = 5 (4 5). Tibia III 32 (32 37), ϕ 95 (95 132), kt 22 (17 22), L/W = 6 (4 6). Tarsus III 90 (90 105), 2.8 ( ) times of length of tibia III, e 13 (13 16), w 13 (13 17).
29 REVISION OF RHIZOGLYPHUS 29 Leg IV 255 ( ). Femur IV 58 (57 62), wf 20 (20 35). Genu IV 38 (38 42). Tibia IV 37 (37 39), ϕ 70 (65 95), kt 15 (14 20), L/W = 6 (6 7). Tarsus IV 99 (99 107), 2.7 ( ) times of length of tibia IV, e 14 (14 16), w 14 (14 19). ADULT HOMEOMORPHIC MALE (Figs. 6 10, n = 2) Gnathosoma. Chelicerae 99 (99 115), cha bifurcate, 5 (5 6); elcp 9 (7 9); infracapitular setae 32 (32 37). Dorsum. Idiosoma 462 ( ) long, 305 ( ) wide. Prodorsal shield evenly punctulate, posterior margin slightly concave, 95 (95 107) long, distance between ve-ve 72 (72 80). Setae vi thick and blunt, with minute denticules at terminal half, 92 (92 95) long, 2.6 ( ) times of length of genu I, distance vi-vi 10 (10 12); ve minute, 4. Setae sci obviously long, 40 (40 57), distance between scisci 46 (46 52); sce prominently long, 247 ( ), distance between sci-sce 30 (30 32), ratio sci-sci : sci-sce = 1.5 ( ). Grandjean's organ thin and long, bifurcate but one branch may hide behind the other, 29 (29 30). Supracoxal setae scx slender and pointed, 40. Setae c 1 27 (27 42), 0.7 ( ) times of length of d 2, distance between c 1 - c ( ); setae c 2 44 (44 60); c p 221 ( ); c 3 35 (35 47); d 1 40 (40 57), 1.1 ( ) times of length of d 2, distance between d 1 -d 1 71 (71 92); d 2 37 (37 47), d 2 -gla 27 (27 37); e (20 255), 5.5 ( ) times of length of d 2, distance between e 1 -e ( ); e 2 >145 (282), 1.1 times of length of f 2 ; f ( ); h ( ); h ( ); h ( ). Venter. Setae 1a 30 (30 32), 3a 18 (18 23), 3b 30 (30 40), g 33 (33 44), 4a 25 (25 30); ps 1 short, 17 (17 26), 0.5 ( ) times as long as genu IV; ps 2 20 (20 27), 0.5 ( ) times as long as genu IV; ps 3 thin, 10 (10 15), 0.3 times of length of genu IV. Anal suckers 42 (37 42) 40 (40 42). Anal discs with 7 9 radiating lines, 22 (20 22) 23 (23 24). Aedeagus tapered, 52 (52 53), lumpy internally.
30 30 FAN & ZHANG (2004) FIGURE 6. Rhizoglyphus caladii Manson (adult homeomorphic male). Dorsal view of idiosoma.
31 REVISION OF RHIZOGLYPHUS 31 FIGURE 7. Rhizoglyphus caladii Manson (adult homeomorphic male). Ventral view of idiosoma.
32 32 FAN & ZHANG (2004) FIGURE 8. Rhizoglyphus caladii Manson (adult homeomorphic male). A, ventral view of chelicera; B, infracapitulum; C, left lateral sclerite and associated structures; D, solenidia and famulus of tarsus I; E, abnormal solenidia of tarsus II; F, normal solenidion of tarsus II.
33 REVISION OF RHIZOGLYPHUS 33 FIGURE 9. Rhizoglyphus caladii Manson (adult homeomorphic male). A, B, aedeagus; C, anal suckers; D, tibia IV.
34 34 FAN & ZHANG (2004) FIGURE 10. Rhizoglyphus caladii Manson (adult homeomorphic male). A, leg I; B, leg II; C, leg III; D, leg IV.
35 REVISION OF RHIZOGLYPHUS 35 Leg I 205 ( ) long. Femur I 62 (62 75), vf 60 (60 72). Genu I 35 (35 40), ratio σ' : σ" = 0.8, σ' 32 (32 37), σ" 42 (42 45), cg slender, 19 (19 22), L/W = 6 (6 8), mg slender, 27 (26 27), L/W = 11 (11 15). Tibia I 32 (32 37), solenidion ϕ 121 ( ), gt slender, 16 (16 17), L/W = 6 (6 7), ht 11 (11 12), L/W = 3. Tarsus I 77 (77 105), 2.4 ( ) times of length of tibia I, spine ba 11, L/W = 2, ω 1 20 (20 22), ε 7, ω 2 10, ω 3 21 (21 25), e 14 (14 16), wa 13 (13 14). Leg II 210 ( ). Femur II 60 (60 72), vf whip-like, 72 (72 97). Genu II 37, σ 30 (30 35), cg slender, 16 (16 22), L/W = 5 (5 8), mg slender, 25 (25 34), L/W = 11 (11 13). Tibia II 35 (34 35), ϕ 108 ( ), gt slender, 17 (17 24), L/W = 7 (7 9), ht 10 (10 11), L/W = 2 (2 3). Tarsus II 82 (82 97), 2.3 ( ) times of length of tibia II, ba 11 (11 12), L/W = 2 (2 3), ω 21 (21 25), e 15, wa 14 (14 17). Leg III 231 ( ). Femur III 50 (50 57). Genu III 32 (32 40), σ 20 (20 25), ng slender, 15 (15 17), L/W = 5 (5 6). Tibia III 30 (30 37), ϕ 112 ( ), kt slender, 16 (16 20), L/W = 5 (5 6). Tarsus III 87 (87 99), 2.9 ( ) times as long as tibia III, e 14 (14 15), w 15 (15 16). Leg IV 239 ( ). Femur IV 55 (55 66), wf 30 (30 42). Genu IV 37 (37 45). Tibia IV 36 (36 40), ϕ 11 (11 12), kt 15 (15 21), L/W = 6 (6 8). Tarsus IV 76 (76 90), 2.1 ( ) times of length of tibia IV, w 18 (17 18). TRITONYMPH (Figs , n = 1) Gnathosoma. Chelicerae 97, cha brached terminally, 6; elcp 9; infracapitular setae 32. Dorsum. Idiosoma 530 long, 361 wide. Prodorsal shield evenly punctulate, posterior margin slightly concave, 112 long, distance between ve-ve 71. Setae vi with blunt tips, 65 long, 2.2 times of length of genu I, distance between vi vi 10; ve 4. Setae sci small, 27, distance between sci sci 37; sce prominently long, 167, distance between sci sce 35, ratio sci-sci : sci-sce = 1.0. Supracoxal setae scx slender and
36 36 FAN & ZHANG (2004) pointed, 32. Setae c 1 30, 1.1 times of length of d 2, distance between c 1 - c 1 108; c 2 31; c p 143; c 3 30; d 1 31, 1.1 times of length of d 2, distance between d 1 -d 1 65; d 2 27, distance between d 2 -gla 35; e 1 121, 4.5 times of length of d 2, distance between e 1 -e 1 56; e 2 142, 1.1 times of length of f 2 ; f 2 128; h 1 173; h 2 158; h Venter. Setae 1a 25, 3a 15, 3b 24, g 15, 4a 17. Anal opening with 3 pairs of setae; ps 1 16, 0.6 times of length of genu IV; ps 2 23, 0.9 times of length of genu IV; ps 3 22, 0.8 times of length of genu IV. Leg I 179 long. Femur I 47, vf 42. Genu I 30, ratio σ' : σ" = 0.8, σ' 25, σ" 32, cg 14, L/W = 5, mg slender, 17, L/W = 7. Tibia I 25, solenidion ϕ 104, gt slender, 17, L/W = 7, ht 10, L/W = 4. Tarsus I 69, 2.8 times of length of tibia I, ba 10, L/W = 3, ω 1 14, ε 5, ω 2 6, ω 3 18, e 12, wa 12. Leg II 180. Femur II 45, vf 52. Genu II 32, σ 19, cg 10, L/W = 3, mg slender, 16, L/W = 7. Tibia II 27, ϕ 101, gt slender, 17, L/W = 7, ht 7, L/W = 2. Tarsus II 61, 2.3 times of length of tibia II, ba 10, L/W = 3, ω 17, e 12, wa 14. Leg III 167. Femur III 40. Genu III 25, σ 12, ng 9, L/W = 3. Tibia III 25, ϕ 77, kt 12, L/W = 4. Tarsus III 66, 2.6 times of length of tibia III, e 10, w 11. Leg IV 170. Femur IV 45, wf 17. Genu IV 27. Tibia IV 25, ϕ 25, kt 7, L/W = 4. Tarsus IV 71, 2.8 times of length of tibia IV, e 7, w 11. LARVA (Figs , n = 1) Gnathosoma. Chelicerae 41, cha 4. Dorsum. Idiosoma 162 long, 113 wide. Prodorsal shield evenly punctulate, 43 long. Setae vi with blunt tips, 12, 1.2 times of length of genu I, distance between vi-vi 5. Setae sci very small, 11, distance between sci-sci 22; sce prominently long, 53, distance between sci-sce 15, ratio sci-sci : sci-sce = 1.5. Grandjean's organ 8. Supracoxal setae scx slender. Setae c 1 8, 1.1 times of length of d 2, distance between c 1 -c 1 46; c 2 9; c p 43; c 3 7; d 1 8, 1.1 times of length of d 2, distance between
37 REVISION OF RHIZOGLYPHUS 37 d 1 -d 1 23; d 2 7; e 1 39, 5.6 times of length of d 2, distance between e 1 -e 1 25; e 2 42; h 1 53; h Venter. Setae 1a 7, 3b 7. Claparède organ long, its basal part 4.0 times as long as terminal part. Leg I 60 long. Femur I 21, vf 23. Genu I 10, ratio σ' : σ" = 0.8, σ' 10, σ" 12, cg 6, mg 8. Tibia I 10, solenidion ϕ 41, gt 7, ht 5. Tarsus I 21, 2.1 times as long as tibia I, ba 4, ω 1 10, ε 3, ω 2 and ω 3 absent, e 3, wa 4. Leg II 58. Femur II 19, vf 20. Genu II 19, σ 8, cg 4, mg 7. Tibia II 10, ϕ 34, gt 7, ht 4. Tarsus II 27, 2.7 times of length of tibia II, ba 3, ω 7, e 5, wa 4. Leg III 43. Femur III 20. Genu III 10, σ 5, ng 4. Tibia III 10, ϕ 39, kt 5. Tarsus III 30, 3.0 times of length of tibia III, e 5, w 4. EGG (n = 4) Oval, 162 ( ) long, 112 ( ) wide; length : width = 1.5 ( ). Material examined HOLOTYPE: adult homeomorphic male, NEW GUINEA: from Caladium tubers, 3.x.1966, R.F. Winch, NPPRL (Auckland), P.Q.A 558 (III), with 2 females and 1 male of Tyrophagus sp. on same slide. PARATYPES: same data as holotype, P.Q.A 558 (IV), 1 adult female / P.Q.A 558 (I), 1 adult homeomorphic male, with 5 adult homeomorphic males of Rhizoglyphus setosus on same slide. Other material Same data as holotype, P.Q.A 558, 1 adult female. CHINA (TAIWAN). From Alocasia macrorrhiza, 9.vii.2000, W.H. Chen, TAL089A13, 1 adult female. INDIA / NEPAL. From bulbs of Calanthe herbacea, 10.xi.1981, R. Mulholland, NPPRL (Auckland), P.Q.A5084, 2 adult females, 1 tritonymph.
38 38 FAN & ZHANG (2004) FIGURE 11. Rhizoglyphus caladii Manson (tritonymph). A, dorsal view of idiosoma; B, ventral view of chelicera; C, right side of infracapitulum; D, solenidia, famulus and spine of tarsus I; E, solenidion and spine of tarsus II.
39 REVISION OF RHIZOGLYPHUS 39 FIGURE 12. Rhizoglyphus caladii Manson (tritonymph). A, leg I; B, leg II; C, leg III; D, leg IV.
40 40 FAN & ZHANG (2004) FIGURE 13. Rhizoglyphus caladii Manson (larva in egg). Dorsal view of idiosoma.
41 REVISION OF RHIZOGLYPHUS 41 FIGURE 14. Rhizoglyphus caladii Manson (larva in egg). A, ventral view of idiosoma; B, Claparède organ.
42 42 FAN & ZHANG (2004) Habitat and distribution Alocasia macrorrhiza (L.) (giant alocasia), CHINA (TAIWAN) (Ho & Chen, 2001). Colocasia formosana Hayata (taro), CHINA (TAIWAN) (Ho & Chen, 2001). Calanthe herbacea, INDIA / NEPAL (current work). Caladium tubers, NEW GUINEA (Manson 1972; current work). Remarks Ho & Chen (2001) realized that R. longispinosus Ho & Chen, 2001 collected from Taiwan Island was close to R. caladii Manson and thought it was different from the latter in having longer scx and thinner base of inner part of spermatheca (basal disc of sacculus). After careful comparison of slides from different localities and hosts we found that the described characters of R. longispinosus fall well within the range of R. caladii Manson (Table 1) and we consider them conspecific. Therefore, R. longispinosus Ho & Chen is a junior synonym of R. caladii Manson, TABLE 1. Variation among specimens of adult females of R. caladii from different localities. India New Guinea Taiwan scx d 2 -gla e 1 : d ps ps ps Distance between sclerites of oviducts
43 REVISION OF RHIZOGLYPHUS 43 Rhizoglyphus columbianus Oudemans, 1924 (Figs ) Rhizoglyphus columbianus Oudemans, 1924b, 6: 321; Fain, 1988, 29: 55. Rhizoglyphus tacitri Manson, 1972, 13: 641; syn. n. Diagnosis Adult female. Cheliceral setae branched terminally. Prodorsal shield coarsely and evenly punctulate. Setae vi thick and pointed, sci small, less than one eighth of length of genu I, ratio sci-sci : sci-sce = 0.8 ( ). Grandjean's organ bifurcate distally. Supracoxal setae scx minute or small. Setae c ( ) times of length of d 2, c 3 vestigial or not visible, d ( ) times of length of d 2, d 2 very close to gla, e ( ) times of length of d 2, e ( ) times of length of f 2. Anal opening with 1 pair of strong, 1 pair of small and 2 pairs of vestigial setae, ps 1 and ps 2 vestigial, ps 3 less than one fourth of length of genu IV, ad 1 prominent, more than three times of length of ps 3, ad 2 and ad 3 absent. Copulatory opening with a prominent circular shield; spermathecal duct long and narrow. Base of inner part of spermatheca moderately expanded, sclerites of oviducts U-shaped, distance between them 30 (30 45), basal part one sixth to one fourth of branches. Genu I mg L/W = 3 (3 4), ratio σ' : σ" = 1.1 ( ). Solenidion ω 1 on tarsus I stout, 18 (17 19). Conical spine ba on tarsus I about 1.1 ( ) times of length of ω 1. Genu II cg L/W = 3 (3 5), mg L/W = 3 (3 4). Adult homeomorphic male. Setae vi 2.6 ( ) times as long as genu I. Setae c ( ) times of length of d 2, c 3 vestigial or not visible, d ( ) times of length of d 2, d 2 very close to gla, e ( ) times of length of d 2, e ( ) times of length of f 2. Ratio sci-sci : sci-sce = 0.7 ( ). Aedeagus trapezoidal terminally, canal of aedeagus with 8 9 lumps. Anal discs with 6 9 radiating lines, its diameter about as long as ps 2. Setae ps 1 tiny, 0.2
44 44 FAN & ZHANG (2004) ( ) times of length of genu IV, less than one half of ps 2. Setae ps ( ) times of length of genu IV, ps 3 thick and blunt. Ratio σ' : σ" = 1.2 ( ). Solenidion ϕ on tibia IV stout, about one half of length of ventral seta kt. Tritonymph. Setae vi 2.7 ( ) times as long as genu I. Setae c ( ) times of length of d 2, c 3 vestigial or not visible, d ( ) times of length of d 2, d 2 close to gla, e ( ) times of length of d 2, e ( ) times of length of f 2. Anal opening with 4 pairs of setae, 3 pairs of them vestigial. Protonymph. Setae vi 2.8 times as long as genu I. Setae c ( ) times of length of d 2, c 3 vestigial or not visible, d ( ) times of length of d 2, d 2 close to gla, e ( ) times of length of d 2, e ( ) times of length of f 2. Setae ps 1 not visible, ps 2 vestigial. Larva. Setae vi 2.6 ( ) times as long as genu I. Setae c ( ) times of length of d 2, d ( ) times of length of d 2, e ( ) times of length of d 2. Claparède organ long, its basal part 2.6 ( ) times as long as terminal part. Description ADULT FEMALE (Figs , n = 5) Gnathosoma. Chelicerae 151 ( ), cha branched terminally, 10 (10 11); palpal supracoxal setae elcp 19 (16 21); infracapitular setae m 45 (35 45). Dorsum. Idiosoma 805 ( ) long, 651 ( ) wide. Prodorsal shield 155 ( ) long, coarsely and evenly punctulate, posterior margin not concave, distance between ve-ve 132 (88 132). Setae vi thick and pointed, 120 (85 145) long, 2.4 ( ) times of length of genu I, distance between vi-vi 17 (12 17); ve small, 8 (7 15). Setae sci tiny, 5 (3 5), distance between sci-sci 57 (41 57); sce prominently long, 198 ( ), distance between sci-sce 75 (48
45 REVISION OF RHIZOGLYPHUS 45 75), ratio sci-sci : sci-sce = 0.8 ( ). Grandjean's organ bifurcate distally, 27 (21 29). Supracoxal setae scx minute or small, 6 (3 17). Setae c 1 40 (24 42), 1.5 ( ) times of length of d 2, distance between c 1 -c ( ); c 2 47 (31 47); c p 172 ( ); c 3 vestigial, 1 4; d 1 45 (33 47), 1.7 ( ) times of length of d 2, distance between d 1 -d (75 177); d 2 27 (15 27) long, very close to gla, d 2 -gla 12 (7 12); e (81 127), 4.7 ( ) times of length of d 2, distance between e 1 -e (97 210); e (86 148), 1.3 ( ) times of length of f 2 ; f (54 100); h ( ); h (98 180); h (56 195). Venter. Setae 1a 45 (24 45), 3a 20 (11 20), 3b 52 (23 52), g 27 (16 35), 4a 42 (18 42). Anal opening with 1 pair of strong, 1 pair of small and 2 pairs of vestigial setae; ps 1 and ps 2 vestigial, 1 (1 2); ps 3 6 (3 7) long, 0.1 ( ) times of length of genu IV; ad 1 34 (24 34) long, 5.7 ( ) times of length of ps 3 ; ad 2 and ad 3 absent. Copulatory opening connected with a prominent circular shield. Spermathecal duct long and narrow, 65 (65 92) long. Base of inner part of spermatheca medium-size expanded; distance between sclerites of oviducts 30 (30 45). Sclerites of oviducts U-shaped, basal part one sixth to one fouth of length of branches, basal part 1 (1 2), branches 9 (6 9). Leg I 273 ( ) long. Femur I 77 (62 77), vf whip-like, 80 (57 80). Genu I 50 (37 52), ratio σ' : σ" = 1.1 ( ), σ' 42 (38 42), σ" 37 (35 40), cg 29 (18 29), L/W = 4 (4 5), mg 17 (14 19), L/W = 3 (3 4). Tibia I 37 (30 40), solenidion ϕ 135 ( ), gt slender, 32 (18 32), L/W = 12 (6 13), ht 17 (15 19), L/W = 2 (2 3). Tarsus I 105 (82 105), 2.8 ( ) times of length of tibia I, ba 20 (17 24), L/W = 2 (2 3), 1.1 ( ) times of length of solenidion ω 1, ω 1 stout, 18 (17 19), ε 7 (7 8), ω 2 10 (8 10), ω 3 25 (19 25), e 26 (23 27), wa 22 (17 22).
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