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10 Cards in this Set
- Front
- Back
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Phylum Enchinodermata: name the classes
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Asteroidea: starfis
Enchinoidea: sea urchins and sand dollars Ophiuroidea: brittle star Holothuroidea:sea cucumbers |
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coelom
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well develop coelom
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respiratory system and pigment
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**dermal branchiae
Gases diffuse via dermal branchiae; soluble wastes released by simple diffusion across surface epithelium |
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Circulatory system
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open
*lack heart *WVS --cilia associated w/ WVS circulate coelomic fluid |
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Skeletal
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Endoskeleton (CaCO3) plate, epidermis on top
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cephalization
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none
**brittle star (Ophiuroidea) and starfish have light-sensing eyes on each arm |
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nervous system
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**nerves distributed throughout arm and disk; no special sense organ except for starfish and brittle star
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digestive system
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Capture prey with TUBE FEET---> evert CARDIAC STOMACH---> secretes mucus and digestive enzymes from HEPTIC CAECA---> food int CARDIA/PYLORIC STOMACH---> digestive caeca---->rectal caeca---> anus
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execretory system
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None
--Osmoconformers-- wastes diffuse from skin |
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locomotion
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moves through WVS and tube feet
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