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6 Cards in this Set
- Front
- Back
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Describe 4 distinct characteristics of the body plan of echinoderms.
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Covered in thin layer of ciliated tissue, often with spines/bumps
Radial symmetry: pentamerous ( 5 part ) only as adults. Internal skeleton Water vascular system |
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What type of nervous system do echinoderms have?
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Nerve ring.
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What are 3 functions of the water vascular system?
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- Circulation of food/wastes
Gas exchange Locomotion Feeding |
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List each of the different types of feeding modes found within each of the 5 classes of Echinodermata, providing an example of organism for each and noting characteristics that help them feed how they do.
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Grazers- Urchins: They use their aristotle’s lantern
Filter Feeders- Sand dollars: They put their oral surface towards the current. Deposit Feeders- Sea cucumbers: They break down detritus. Predators/ Scavengers- Sea stars: They have an eversible stomach |
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Which classes have pedicellariae and what is their function?
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Class Asteroidea (sea stars) and Class Echinoidea (urchins)
Pedicellariae are beak like structures that aid in defense and cleaning. |
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Compare the regeneration ability of Class Asteroidea (sea stars), Class Ophiuroidea (brittle stars), Class Echinoidea (sea urchins, sand dollars), Class Holothuroidea (sea cucumbers), Class Crinoidea (feather stars, sea lilies).
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Asteroidea: Full as long as gonads are present.
Ophiuroidea: Only leg/ arm and disk must be present. Echinoidea: Are only able to repair the holes. Holothuroidea: Some complete regeneration (rare) of internal organs. Crinoidea: Arms and organs. |
