Abstract
The morphology of archaeocytes, sponge stem cells, was studied in Oscarella malakhovi during asexual reproduction (budding) using light and electron microscopy. Electron-dense germinal granules, which are ultrastructural markers and key organelles of metazoan germline cells and potentially gametogenic stem cells of asexually reproducing invertebrates, were found in the perinuclear cytoplasm of the sponge archaeocyte for the first time. Common features of the morphological and functional organization of the “primary” stem cells in asexually reproducing invertebrates and the germline cells in Metazoa are discussed.
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