24.1 Arthropod Diversity. KEY CONCEPT Arthropods are the most diverse of all animals.
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1 KEY CONCEPT Arthropods are the most diverse of all animals.
2 Arthropod features are highly adapted. Arthropods are invertebrates that share several features. exoskeleton (cuticle) made of chitin jointed appendages segmented body parts
3 Arthropods are classified into five groups. Trilobites extinct, bottom feeders The oldest fossils are of trilobites that date back 540 million years.
4 Crustaceans live in oceans, freshwater streams, and on land
5 Chelicerates specialized daggerlike mouthparts
6 Insects most live on land, have six legs
7 Myriapods long bodies and many pairs of legs
8 Arthropods have an open circulatory system. Sensory organs such as antennae are made of modified cuticle. Most arthropods have compound eyes.
9 The evolutionary relationship between arthropods and other invertebrates remains under question. body segmentation similar to annelids molecular evidence suggests segmentation is analogous development Velvet worms and water bears are considered the closest relatives of arthropods.
10 KEY CONCEPT Crustaceans are a diverse group of ancient arthropods.
11 Crustaceans evolved as marine arthropods. Crustaceans share several common features. two distinct body sections, cephalothorax and abdomen one pair of appendages per segment two pairs of antennae exoskeleton carapace
12 Crustacean appendages are used for a variety of functions. collecting and manipulating food attracting females protection Appendages include claws, antennae, walking legs, swimmerets, and mandibles.
13 There are many different types of crustaceans. Crustaceans vary in both anatomy and structure. Decapods such as lobsters and crabs have ten legs.
14 Barnacles are sessile filter feeders wrapped in a hard shell.
15 Isopods such as pill bugs have flattened bodies and seven pairs of legs. Tongue worms are parasites found in a host s lungs or nasal passages.
16 KEY CONCEPT Arachnids include spiders and their relatives.
17 Arachnids are the largest group of chelicerates. There are three major groups of chelicerates. horseshoe crabs
18 Arachnids are the largest group of chelicerates. There are three major groups of chelicerates. horseshoe crabs sea spiders arachnids
19 Chelicerates share several features. no antennae four pairs of walking legs one pair each of chelicerae and pedipalps Arachnids are a group of chelicerates that live on land. eight legs fanglike pincers that inject venom silk glands fangs poison gland spinnerets
20 Arachnids have four different adaptations that reduce water loss. waterproof cuticle book lungs Malpighian tubules spiracles
21 Arachnids have evolved into a diverse group. All spiders make silk and produce venom.
22 Arachnids have evolved into a diverse group. Spiders make up half of the more than 60,000 known arachnid species. Arachnids also include mites, ticks, chiggers, and scorpions.
23 KEY CONCEPT Insects show an amazing range of adaptations.
24 Insects are the dominant terrestrial arthropods. Insects are in nearly every ecological niche. Insects have a body with three parts. head thorax abdomen abdomen thorax head
25 Some insects live independently, others live in social colonies.
26 Insects undergo metamorphosis. In incomplete metamorphosis, insects look like miniature adults when they hatch. There are three life stages of incomplete metamorphosis. larva adult nymph stage nymph adult larvae
27 In complete metamorphosis, the insect changes form entirely. There are three life stages of incomplete Larva metamorphosis. egg Egg Pupa larva pupa adult Adult
28 Insects have adapted to life on land. The evolution of flight occurred in insects 400 million years ago.
29 An insect s mouth parts are adaptations related to its specialized diet. sucking mouth parts
30 chewing mouthparts
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