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14 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What class do sea cucumbers belong? |
Class Holothuroidea |
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Describe the defense mechanism of a sea cucumber. |
They cast out their internal organs by a strong muscular contraction. Lost parts are regenerated. |
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How many ambulacral areas does an echinoderm have? |
5 or more |
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What is a sole? |
Tube feet in the dorsal ambulacral area of sea cucumbers. |
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What two systems does the respiratory tree serve as? |
Respiratory and excretory |
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Describe the feeding mechanism of a sea cucumber. |
Sedentary:They trap suspended food particles in mucous of outstretched tentacles then they stick their tentacles one by one into the pharynx to suck off food. Movers: Crawl, grazing for food along the bottom with tentacles. |
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What is another name for a body disc? |
Calyx |
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What is the name of the structure that is arranged like barbs on a feather disc? |
Pinnules |
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What is missing from the water-vascular system of Crinoids? |
A madreporite |
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Describe the locomotion in sea cucumbers. |
Sluggish. Moving partly by tube feet and partly by waves of contractions in the muscular body wall. |
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What is special about the locomotion of Crinoids? |
During metamorphosis they are sessile, after several months they are free-moving and can swim. |
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What is the species of echinoderm that has many branched arms and is free-moving as an adult? |
Crinoidea |
Feather stars, sea lilies |
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Holothuroidea are elongated along which axis? |
Oral-aboral |
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List the 5 most noticeable characteristics of echinoderms. |
Spiny endoskeleton of plates Water-vascular system Pedicellariae Basic pentaradial symmetry in adults Dermal branchiae |
Susan Wore Pretty Blue Dresses |
