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    Gametogenesis and Embryonic Development in the Calcareous Sponges Clathrina coriacea and C. blanca from Santa Catalina Island, California

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    Subject
    Gametogenesis; Embryonic Development; Calcareous Sponges; Clathrina coriacea; C. blanca
    Author
    Johnson, Marion Fischel
    Journal Title
    Scas: Bulletin of the Southern California Academy of Sciences
    Volume
    78
    Issue
    scas/vol78/iss3; 3
    Metadata
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    URI
    https://scholar.oxy.edu/handle/20.500.12711/9471
    Abstract
    Gametogenesis and embryonic development of Clathrina coriacea and C. blanca, two closely related calcareous sponges from Santa Catalina Island, California, are described. Oogenesis is asynchronous in both species. Spermato- genesis was not observed. Cleavage is total and equal, resulting in the formation of a blastula larva. The larva of C. coriacea contains one large posterior granular cell, whereas two posterior granular cells are present in the larva of C. blanca. Migration of the larval blastomeres into the blastocoel begins while the larva is in the tube of the parent sponge.
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