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Ward_Lect31A_Arthropoda 1 ppt

Ward_Lect31A_Arthropoda 1 ppt - BIS2C Winter 2009(Ward...

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BIS2C Winter 2009 (Ward) Lecture 31. Arthropoda, Part 1 Today’s lecture (4 March) introduction to Arthropoda major features within-group diversity (part) Friday lecture Arthropoda, Part 2
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Major lineages of metazoans
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Protostomes Arthropoda molting of exoskeleton, regulated by ecdysone
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Numbers of described species among the major animal groups (from Wilson, 1992). Sponges and diploblasts
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Numbers of described species among the major animal groups (from Wilson, 1992). Mollusca
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Numbers of described species among the major animal groups (from Wilson, 1992). Annelida
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Numbers of described species among the major animal groups (from Wilson, 1992). Arthropoda
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Arthropoda a hyperdiverse group extraordinary diversity, comprising about 3/4 of all described animal species many other species undescribed or undiscovered, perhaps 50+ million species altogether found in all habitats (marine, freshwater, terrestrial)
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Arthropoda Bilaterally symmetrical coelomate protostomes with… segmented body , with structures repeated in each segment
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Arthropoda Bilaterally symmetrical coelomate protostomes with… segmented body, with structures repeated in each segment paired jointed appendages with internal muscle attachments
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Arthropoda Bilaterally symmetrical coelomate protostomes with… segmented body, with structures repeated in each segment paired jointed appendages with internal muscle attachments The name Arthropoda = “jointed foot”
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Arthropoda Bilaterally symmetrical coelomate protostomes with… segmented body, with structures repeated in each segment paired jointed appendages strong tendency towards tagmosis : regional specialization of body ( tagmata , e.g., head, thorax, abdomen)
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Degree of tagmosis (division into functional subunits ) varies among different kinds of arthropods Centipede Lobster
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Arthropoda Bilaterally symmetrical coelomate protostomes with… segmented body, with structures repeated in each segment paired jointed appendages tagmosis: division of body into functional subunits exoskeleton (composed of chitin and cuticle proteins) organized into articulating plates Courtesy of: http://evolution.berkeley.edu/evolibrary/home.php
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Consequences of an exoskeleton support for walking on land protection against predators chitin reduces water loss But it also introduces constraints on growth…
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Arthropoda Bilaterally symmetrical coelomate protostomes with… segmented body, with structures repeated in each segment paired jointed appendages
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