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| | ADW: Porifera: Information |
 | | Sponges have cellular-level organization, meaning that that their cells are specialized so that different cells perform different functions, but similar cells are not organized into tissues and bodies are a sort of loose aggregation of different kinds of cells. |
 | | In most sponges for which developmental patterns are known, the fertilized egg develops into a blastula, which is released into the water (in some species, release takes place right after fertilization; in others, it is delayed and some development takes place within the parent). |
 | | Sponges in the class Calcarea, considered to be the most primative group, and have asconoid, synconoid and leuconoid members. |
| animaldiversity.ummz.umich.edu /porifera.html (941 words) |
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