Unionicola (Breaudatax) megachela Vidrine 1985c Plates in Vidrine (1996a)

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Robert Heath
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1 Synonomy-- Unionicola (Breaudatax) megachela Vidrine 1985c Plates in Vidrine (1996a) Unionicola sp. nov. type R in Vidrine 1974a and 1980a Unionicola (Polyatax) megachela Vidrine 1985c and 1986e Unionicola (Breaudatax) megachela Vidrine 1985c in Vidrine 1994 Museum type number(s) and location-- CNC 18820, Canadian National Collections, Biosystematics Research Institute, Ottawa, Canada. Type locality and host-- Holotype (male) found in Plectomerus dombeyana (Valenciennes) from Louisiana Irrigation Canal ca. 5.0 km north of Iowa at Rte. LA 383, Jefferson Davis Parish, Louisiana, collected by Macky and M. F. Vidrine. Etymology-- Named for the extremely enlarged tarsal claws of the walking legs. Diagnosis-- Character states of the subgenus; male and female dorsum with 4 lightly sclerotized plates; coxal plates reticulate, well sclerotized and possessing posterior projections; female genital field with anterior acetabular plates each bearing 2 acetabula and a pair of short, thick spines, posterior acetabular plates each bearing 3 acetabula and a single, short, hair-like seta; male genital field with 5 acetabula per acetabular plate; serrate spines on walking legs and pedipalps; pedipalps thick and with tarsal claws longer than the length of the tarsus; tarsal claws of walking legs large and simple; male fourth walking leg sexually dimorphic with the Ge bearing 2, slightly enlarged, dorsal spines, and the Ti bearing a single, slightly enlarged, dorsal spine. Male (3 specimens)(all measurements in micrometers (µm)-- Length including capitulum 667 ( ); dorsal anterior plates 70 (60-80) long, 53 (40-65) wide; dorsal posterior plates 60 long, 40 wide; length of posterior coxal group 290; dorsal lengths of pedipalp segments: Ge 50; Ti 90 (85-95); Ta 12 (10-15); dorsal lengths of leg segments: leg I: TFe 80 (75-85); Ge 100 (95-105); Ti 95 (90-100); Ta 100 (95-

2 105); leg IV: TFe 88 (85-89); Ge 132 ( ); Ti 148 ( ); Ta 147 ( ). Female (3 specimens)-- Length including capitulum 767 ( ); dorsal anterior plates 65 long, 50 wide; dorsal posterior plates 50 long, 40 wide; length of posterior coxal group 225; dorsal lengths of pedipalp segments: Ge 53 (50-55); Ti 94 (90-95); Ta 13 (10-15); dorsal lengths of leg segments: leg I: TFe 90 (85-95); Ge 108 ( ); Ti 102 ( ); Ta 107 ( ); leg IV: TFe 93 (90-100); Ge 142 ( ); Ti 157 ( ); Ta 155 ( ). Notes-- Unionicola megachela lives between the labial palps of its hosts, and the adults are commonly found in the hosts during the winter months. Eggs are deposited in the hosts' mantle tissue in the proximity of the labial palps. Usually 1-5 individuals are found between the labial palps of an infested host. Hosts include members of many diverse genera of freshwater mussels from Louisiana, Mississippi, Arkansas, and Texas. U. megachela is readily diagnosed by its large tarsal claws on the walking legs, serrated spines, and pedipalpal tarsal structure. It occupies a similar habitat to that of U. serrata (Vidrine 1980a and 1983); however, the habitats of the infested mussels differ in that U. serrata usually occurs in mussels in sandy to rocky bottom streams, while U. megachela usually occurs in mussels in muddy or clayey bottom streams (Vidrine 1985c). Hosts: Amblema plicata plicata Say: Louisiana (Vidrine 1980a)(includes A. p. perplicata). Anodonta suborbiculata Say: Louisiana (Vidrine 1980a). (now Utterbackia) Arcidens confragosus (Say): Louisiana (Vidrine 1989a). Fusconaia askewi (Marsh): Fusconaia lananensis (Frierson), Louisiana (Vidrine 1980a). Fusconaia flava (Rafinesque): Louisiana (Vidrine 1989a). Glebula rotundata (Lamarck): Louisiana and Mississippi (Vidrine 1980a). Lampsilis hydiana (Lea): Louisiana (Vidrine 1989a). Lampsilis teres (Rafinesque): Louisiana (Vidrine 1980a). Leptodea fragilis (Rafinesque): Louisiana (Vidrine 1980a).

3 Megalonaias nervosa (Rafinesque): Amblema gigantea (Barnes), Louisiana (Vidrine 1980a). Obliquaria reflexa Rafinesque: Louisiana and Texas (Vidrine 1980a). (now considered to belong to the genus Quadrula by some authors) Plectomerus dombeyanus (Valenciennes): Amblema dombeyana (Valenciennes), Louisiana, Mississippi, Arkansas, and Texas (Vidrine 1980a). Potamilus purpuratus (Lamarck): Proptera purpurata (Lamarck), Louisiana (Vidrine 1980a). Pyganodon grandis (Say): Anodonta grandis Say, Louisiana (Vidrine 1980a). Quadrula apiculata (Say): Louisiana (Vidrine 1980a). Quadrula nodulata Rafinesque: Louisiana (Vidrine 1980a). (now genus Amphinaias) Quadrula pustulosa pustulosa (Lea): Louisiana (Vidrine 1980a). (now Amphinaias) Quadrula pustulosa mortoni (Conrad): Louisiana (Vidrine 1989a). (now Amphinaias) Quadrula quadrula (Rafinesque): Louisiana (Vidrine 1980a). Toxolasma texasensis (Lea): Carunculina parva (Barnes): Louisiana and Texas (Vidrine 1974a and 1980a). Tritogonia verrucosa (Rafinesque): Louisiana (Vidrine 1989a). (now Amphinaias) Truncilla donaciformis (Lea): Louisiana (Vidrine 1980a). Truncilla truncata Rafinesque: Louisiana (Vidrine 1980a).

4 Figures and map from Vidrine (1996):

6 Plate 169 from Vidrine (1996): Top left: male venter. Top right: female venter. Middle left: male posterior venter. Middle right: female posterior venter. Bottom left: male genital left. Bottom right: female venter.

7 Plate 170 from Vidrine (1996): Top left: male venter. Top right: female venter. Middle left: male posterior venter. Middle right: female posterior venter. Bottom left: male pedipalps. Bottom right: female pedipalps.

8 Plate 171 from Vidrine (1996): Top left: male venter. Top right: tarsal claw of leg I. Middle left: male leg IV. Middle right: male leg I. Bottom right: male leg I.

9 Plate 172 from Vidrine (1996): Top left: male pedipalps. Top right: male leg I. Middle left: Male posterior coxal plates. Middle right: tarsal claws of leg IV. Bottom left: Male leg IV. Bottom right: tibia and tarsus of pedipalp.

10 Plate 173 from Vidrine (1996): Male leg IV: Top (left to right): coxa, basifemur, telofemur. Middle left: genu. Middle right: tibia. Bottom left: tibia and tarsus. Bottom right: tarsus and tarsal claws.

11 New plates: Plate 1. Female leg I and pedopalps: Plate 2: Female leg IV:

12 Plate 3: Male leg I: Plate 4: Male leg IV:

13 Plate 5: Male venter: Plate 6: Female genital field:

14 Plate 6: Female venter:

Unionicola (Unionicolides) hoesei Vidrine 1986

Unionicola (Unionicolides) hoesei Vidrine 1986 (adapted from Vidrine s North American Najadicola and Unionicola: Diagnoses and Distributions (1996) and Edwards and Vidrine s Mites of Freshwater Mollusks