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8 Cards in this Set
- Front
- Back
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Phylum Echinoderm |
The phylum of triploblastic, coelmate animals whose members are pentaradially symmetrical as adults and possess a water-vascular system and an andoskeleton covered by epithelium. |
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Echinoderms |
1. Marine, Benthic, some sessile 2. larvae bilaterally symmetrical 3. no discernable brain-nervous system is a nerve net 4. complete digestive tract 5. ambulacral grooves: formed by ossicles in the arms |
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Class Asteroidea |
rays not sharply set off from central disk; ambulacral grooves with tube feet; suction disks on tube feet; pedicellariae present Sea Stars |
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Starfish Anatomy |
Dioecious, sex cannot be determined externally -gonads in each arm -digestive glands in each arm |
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Crown of thorns starfish |
feeds on coral polyps venemous spines population explosion devastate great barrier reef |
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Class Orphiuroidea |
arms sharply marked of from the central disk; tube feet without suction disks; brittle stars |
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Class Echiniodea |
globular or disk shaped; no rays; moveable spine; sea urchins and sand dollars |
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Class Holothuroidea |
no rays; elongate along oral-aboral axi; microscopic ossicles embedded in a muscular body wall; circumoral tenticles; sea cucumbers |
