31_Ward_Arthropoda+1+Outline

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
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This note was uploaded on 03/09/2011 for the course BIS 2 taught by Professor Coolprof during the Spring '11 term at Bank Street College of Education.

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

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