Porifera
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14 terms
Terms | Definitions |
|---|---|
 porifera | "pore-bearing", sponges, 5000 species, mostly marine but freshwater forms |
| Digestion: | not present - incomplete |
| Nutrition: | filter feeding organisms; collar cells (coanocytes), amoebocytes cooperate w/ digestive process |
| choanocyte | "collar cells", function in feeding and reproduction |
| amoebocyte | amoebalike cells that function in digestion, spicule-formation, and reproduction |
| spicules | skeletal elements of a sponge; may be composed of calcium carbonate, silicates, or spongin |
| Circulation: | does not exist |
| Gas Exchange: | through diffusion |
| Nervous System: | no nerves |
| Skeletal System: | spicules = skeletal elements of sponge |
| Muscular System: | no muscles |
| Excretion | no excretory organ, metabolic wastes flow out w/ water |
| Reproduction: | will reproduce sexually (male parts-coanocytes become flagella, amoebocyte-female) and asexually (budding, fragmentation = part will break off and start reproducing) |
| Unique Features: | asymmetrical, only two germ layers present, no organs or organ systems, simplist animals |
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