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12 Cards in this Set
- Front
- Back
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Defining features of Deuterostomes
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-monophyletic
-radial cleavage (stacking) -@ gatrulation, pore forms anus -mesoderm invaginates to form coelem |
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Distinguishing features of Deuterostomes
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-range in size
-morphological complexity -higher trophic positions |
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Other features of Deuterostomes
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-presence of endoskeleton
-highly complex nervous system -important model organisms (zebra fish, mouse) |
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Major Lineages of Deuterostomes
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-Ecinodermata
-Chordata |
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Ecinodermata
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-adult radial symmetry
-water vascular system -podia |
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Chordata
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-pharengial gill slits
-notochord -dorsal hollow nerve chord -muscular post anal tail |
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Movement and feeding in Ecinodermata
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ecinoderms use podia to move and feed
-suspension feeders use podia to move food particles to mouth -deposit feeders secret mucus from podia to trap food particles |
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Movement and feeding in Chordata
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-jaw enable owner to capture its prey by biting
-tetrapod limb enables diverse types of movement -more elaborate nervous system (w/a skull to protect enlarged brain) |
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the Jaw
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-1 hypothesis: arches used to support gills became jaw structures
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amniotic egg
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-minimizes water loss
-supplies developing offspring with nutrients |
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oviparous
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-egg laying strategy
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vivaparous
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-largel in mammalian lineage
-offspring obtains nutrients from placenta |
