Abstract
Spermatogenesis and the fine structure of the spermatozoon in a dicrocoelid trematode,Corrigia vitta have been examined by light and electron microscopy. The testes are composed of two distinct cell types: spermatogenic cells and a non-germinal sustentacular epithelium. Spermatogonia are typically undifferentiated, with the cytoplasm occupied mainly by unattached ribosomes; nucleolus-like bodies are also common. Nuclear division is succeeded by incomplete cytokinesis so that daughter cells are joined and develop syncytially. Division in primary spermatocytes is characterised by nuclear synaptonemal complexes and by the expansion of endoplasmic reticulum and development of Golgi complexes. Coated invaginations of the cell surface frequently occur in spermatocytes and spermatids. During spermiogenesis the nucleus condenses and migrates into a conical-shaped projection of cytoplasm. A centre body is formed and basal bodies produce axial filaments which fuse with the median cytoplasmic projection. Spermatozoa are released from the residual cytoplasm and are of typical trematode structure.
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