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| Animals that lack a backbone; account for 95% of known animal species. |
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| Phylum of animals containing sponges. |
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| An animal that feeds by capturing food particles suspended in the water that passes through their body, which typically resembles a sac perforated with pores. |
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| The central cavity of sponges. |
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| A large opening in a sponge through which water flows out. |
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| Flagellated cells that line the interior of the spongocoel or internal water chambers of sponges; generate a water current and captures food particles to ingest via phagocytosis; aka collar cells. |
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| A gelatinous region that separates the two cell layers of a sponge. |
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| In sponges: take up food from the water and choanocytes, digest it, and carry nutrients to other cells; manufacture tough skeletal fibers within mesohyl (either spicules or spongin). |
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| Each individual animal functions as both male and female in sexual reproduction by producing sperm and eggs. |
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| Phylum of animals containing classes Scyphozoa, Hydrozoa, Cubozoa, and Anthozoa; oldest animal group belonging to the clade Eumetazoa |
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| The central digestive compartment in Cnidarians; aka coelenteron. |
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| Cylindrical animal forms that adhere to the substrate by the aboral end of the body and extend their tentacles, waiting for prey. |
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| A flattened, mouth-down version of the polyp that moves freely in the water by a combination of passive drifting and contractions of its bell-shaped body. |
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| Cells that function in defense and the capture of prey using cnidae. |
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| Capsule-like organelles that are capable of everting. |
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| Class of Cnidaria containing man-of-war, hydras, etc; most are marine; both polyp and medusa stages prominent in most species; polyp stage often colonial. |
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