thesocytes

From ZooTerms (Dictionary of Invertebrate Zoology)
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thesocytes (noun, plural; Greek thesis, deposit; kytos, container): (Porifera) In hibernating fresh water sponge gemmules, binucleate, highly vitelline archaeocytes. thickener cells (Porifera) Cells influencing ray thickness during secretion of calcareous spicules.