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Ch. 5c,part2 Echinoderms, vocabulary review (#8)
This unit is not complete, check back from time to time for changes that have been added.
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| Echinodermata | Phylum of "spiny skins" |
| Chordates | Echinoderms may share a common ancestor with lower chordates |
| Llarval symmetry | Free swimming, bilateral symmetrical larva |
| Adult symmetry | Bottom dwelling, radil symmetrical adults |
| Pentaradial symmetry | Five radii or multiples of 5 |
| Endoskeleton | Internal skeleton composed of calcium plates which may include protruding spines |
| Water-vascular system | A network of water filled canals |
| Tube feet | Numerous small, movable protrusions that aid in movement, feeding, respiration, and excretion |
| Circulatory system | None in echinoderms |
| Respiratory system | None in echinoderms |
| Excretory system | None in echinoderms |
| Nervous sytem | Nerves, but no head nor brain |
| Reproduction | Two sexes; can reproduce sexually or asexually |
| Sessile | Not free living, possible status of fossilized echinoderms |
| Five classes | Crinoidea, Asteroidea, Ophiuroidea, Echinoidea, Holothuroidea |
| Parthenogenesis | Reproduction of organisms without the fusion of gametes of the opposite sexes |
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Science Teacher |
South Fork High School |
| Stuart FL , FL |
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