Porifera & Cnidarians
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14 terms
Terms | Definitions |
|---|---|
 Collar Cells | The lining of the inner surface of a sponge's central cavity. |
| Filter Feeder | Organisms that obtain food by taking it from the water that passes through them. |
| Flagellum | A thin whip like structure that beats back and forth to keep water moving through the sponge. |
| Pores | Tiny openings. |
| Porifera | Phylum meaning "pore bearing". |
| Spicules | Sharp glass or chalk-like structures that support and form the skeleton of a sponge. |
| Spongin | Flexible material that make up the skeleton of some sponges. |
| Cnidarian | Phylum meaning "stinging cells". |
| Cnidocytes | Special stinging structures on cnidarians that look like small harpoons. |
| Colenteron | The bell-shaped part of a medusa shaped cnidarian where food is digested. |
| Medusa | Bowl-shaped form of cnidarians. |
| Mesoglea | The jelly layer in cnidarians between the two cell layers. |
| Polyp | Vase-shaped body form of cnidarians. |
| Sessile | An organism that does not move. It remains attached to one place. |
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