The body-cavity ultrastructure of two species of colonial Kamptozoa is investigated in detail. The body cavity is separated from all surrounding tissues by a basal lamina, which underlies the ectodermal and endodermal epithelia and covers the excretory system, gonads, muscular cells, and nerves that cross the body cavity. The basal lamina does not cover the body-cavity cells, which, in respect to this feature, can be classified as connective-tissue cells. Several types of cells were identified in the body cavity of the calyx: amoeboid cells, dark spindle-shaped cells, cells containing phagosomes, cells of dorsoventral bundles, and cells adjoining the surface of the internal organs (gonads, digestive and nervous systems). The tubular cells of the stalk and stolon, as well as the amoeboid cells of the stolon, are described. The body cavity of Kamptozoa is characterized by features that allow interpreting it as a hemocoel.
Russian Journal of Marine Biology – Springer Journals
Published: Jan 7, 2015
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