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03zarnjaci

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Stijenka tijela od 2 sloja stanica: EKTODERM – vanjski i<br />

ENDODERM - unutrašnji sloj. Središnji želatinozni sloj mezogleja<br />

nema stanica.<br />

Centralna tjelesna šupljina ili gastrovaskularna šupljina -<br />

coelenteron.<br />

Usni otvor okružen<br />

krakovima ili lovkama<br />

- tentakulima.

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