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Arthropods and Skeletal System

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Biology (Sci)
BIOL 111
Irene Gregory- Eaves

Arthropods I Ecdysozoans: Arthropods: - Coelomates - Most dominant group of animals (most diverse) - Appoximately 1000000 spiecies  arthropods diversity dominated by beetles - Burgess shale: Cambrian explosion  Anomalocaris: heard shelled species, development of eyes, mouth part, predatory appendages, armour, approx 1m in length Diversity example: Sytiscus: predaceous diving beetles, adults collect air under wings and use this to breathe underwater Honey bee: among most complex social life (eg. worker bees dance to communicate location of new food course) Arthropod: Joined foot - Largest eukaryotic phylum 8 - Very abundant (1x10 alive at once) - Includes: insects, crustaceans, arachnids - Reduced segmentation: body regions – head, (cefalo)thorax, abdomen - Jointed appendages: specialized Ex. Trilobite: one of first arthropods out there - Rigid exoskeleton: ecdysozoan = molting  non living (can by penetrated by living tissue, like nerves), secreted by epidermis  covers all external surface, digestive tract, tracheae  composed of layers  chitin/protein +CaCO3 (in crustaceans) Exoskeleton advantages: - Physical support - Place for muscle attachment - Physical protection: from abrasion, predation, parasite entry, desiccation
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