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31_Ward_Arthropoda+1+Outline - BIS2C W2011 Arthropoda Part...

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BIS2C W2011 Lecture 31 (4 March 2011) 1 Arthropoda Part 1 Arthropoda a hyperdiverse group comprising about 3/4 of all described animal species Bilaterally symmetrical coelomate protostomes with… segmented body paired jointed appendages subdivision of body into tagmata chitinous exoskeleton periodic molting of exoskeleton paired compound eyes reduced coelom and open circulatory system complete gut well developed nervous, excretory and respiratory systems Reproduction almost entirely dioecious fertilization usually internal development variable, often with larval stage Arthropod diversity: four major groups Chelicerata arachnids, horseshoe “crab” , sea spiders Myriapoda centipedes, millipedes Crustacea crabs, shrimp, lobsters, barnacles, etc. Hexapoda insects and allies Internal phylogeny Classic view: myriapods and hexapods as sister groups New evidence (DNA sequence data, etc.): hexapods related to crustaceans, latter paraphyletic Similarities between myriapods and hexapods evidently represent convergent adaptations for life
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  • Spring '11
  • coolprof
  • BIS2C W2011 Arthropoda, tagmata chitinous exoskeleton, major groups Chelicerata, multi-segmented trunk centipedes, body tagmata

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