Histocompatibility in the Cheilostome Bryozoan Thalamoporella californica

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Abstract
Tissue fusion between colonies of the bryozoan T. californica was studied by characterizing the structure of the interzooidal pores. Unlike past studies, the history of each colony was documented allowing a comparison of fusion among sibling colonies, those derived from the same maternal colony and nonsibling colonies. Fusion occurred only between zooids of the same colony which had grown apart or between sibling colonies. In both cases, a particular type of interzooidal pore was formed. Nonsibling colonies failed to recognize each other and did not form the specialized pore. Apparently, genetic compatability is necessary for the intraspecific, intercolonial fusion of cellular parts in this species.

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