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Phylum: Spongia (Porifera)

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gonangijum<br />

hidrant<br />

Classis: Hydrozoa<br />

U okviru ove klase postoje i vrste koje<br />

imaju samo polipoidnu generaciju kao<br />

na primer kod hidre. (Hydra sp.)<br />

Hidra se razmnožava bespolno<br />

pupljenjem, ali i polno,<br />

obrazovanjem polnih ćelija<br />

čijim spajanjem nastaje zigot<br />

koji se razvija u POLIP, tako da<br />

se uopšte ne razvija MEDUZA.<br />

Hydra sp.

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