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Phylum - Echinodermata
- 1. Calcareous endoskeleton composed of separate plates called ossicles
- 2. Adults with 2nd radial symmetry, larvae bilaterally symmetrical
- 3. Water vascular system - locomotion and prey capture
- 4. Gut complete except where scondarily incomplete (lost)
- 5. No special excretory organs
- 6. Nervous system usually with a central nerve ring and radial nerves
- 7. No parasitic forms
- 8. Dioecious
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Phylum - Echinodermata
Class - Echinoidea
- 1. Sea urchins, sand dollars
- 2. 5000+ spp.
- 3. No arms - body round or disc shaped
- 4. Fused ossicles - endoskeleton which is called a "test", primarily composed of Calcium carbonate
- 5. Unique chewing devise termed "Aristotle's Lantern"
- 6. Locomotion by movable spines - primary and secondary spines - with scattered tube feet (podia)
- 7. Numerous pedicellaria in most species (little pinchers)
- 8. Dioecious
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What class has no arms and its body is round or disc shaped?
Class - Echinoidea
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What class has fused ossicles? (endoskeleton which is called a "test", primarily composed of Calcium carbonate)
Class - Echinoidea
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Phylum - Echinodermata
Class - Holothuroidea
- 1. Sea cucumbers
- 2. 7,000+ spp.
- 3. Deposit and suspension feeders
- 4. Complete digestive tract
- 5. No spines or arms
- 6. Unique respiratory tree for gas exchange
- 7. Cuverian tubules, eviscerate gut when disturbed in some species
- 8. Dioecious
- - These orgnisms breathe through their anus
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What Class do sea stars belong to?
Class - Asteroidea
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What Class do Sea urchins and sand dollars belong to?
Class - Echinoidea
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What Class do Sea cucumbers belong to?
Class - Holothuroidea
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What class does not have any spines or arms?
Class Holothuroidea
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What Class breathes through their anus?
Class - Holothuroidea
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Phylum - Echinodermata
Class - Ophiuroidea
- 1. Brittle or serpent stars
- 2. 2,000+ spp.
- 3. Body stellate - 5 plus arms
- 4. Arms "clearly" set off from the central disc
- 5. Ambulacral grove closed (solid)
- 6. Podia are pointed - no suckers
- 7. Anus lacking
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What Class do brittle or serpent stars belong to?
Class - Ophiuroidea
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What Class has arms "clearly" set off from the central disc?
Class - Ophiuroidea
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What Class is the ambulacral grove closed (solid)?
Class - Ophiuroidea
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What Class lacks an anus?
Class - Ophiuroidea
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Phylum - Echinodermata
Class - Crinoidea
- 1. Sea lillies
- 2. 5,000+ spp.
- 3. Most primitive class among the Echinodermata
- 4. Pelagic and benthic
- 5. Suspension feeders
- 6. Extensive fossil record
- 7. Dioecious
- - Pelagic - free swimming in the water column; ex. a fish
- - Benthic - living in or on top of the substrate
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What Class has a unique respiratory tree for gas exchange?
Class - Holothuroidea
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Pelagic...
- - free swimming in the water column; ex. fish
- - characteristic of the Class - Crinoidea
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Benthic....
- - living in or on top of the substrate
- - Characteristic of the Class Crinoidea
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What Class do Sea lillies belong to?
Class - Crinoidea
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Fused ossicles...
endoskeleton which is called a "test", primarily composed of Calcium carbonate
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What class has a eversible stomach?
Class Asteroidea
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