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10 Cards in this Set
- Front
- Back
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metamerism
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repeating somites or body sections
comes from mesoderm- annelids and arthropods good examples, but so are we |
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oligochaeteme
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no parapodia, few bristles per segment
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arthropoda
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fusion of these segments into larger structures
exoskeleton protects segments reduce over ti |
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why are arthropods diverse and successful
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segmentation, w/ modifications
jointed appendages hard exoskeleton w fused segments behaviorally: division of labor |
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arthropod exoskeleton
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consists of chitin and protein
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functions of arthropod exoskeleton
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minimizes water loss
provides protection muscles and stiff exoskeleton work as part of level system for force production |
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what is special about insects and how long they have lived
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most successful of all animals more than 1 million on th earth
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echinodermata
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deuterostomes
skin usually spiny body wall has spines or plates of calcium carbonate no brain bottom dwelling ; slow moving or sessile forms marine; no osmoregulatory organs |
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how are starfish symmetrical
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a bilaterally symmetrical larval stage
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