Spermatogenesis and spermiogenesis in Microcotyle sp. (Microcotylidae, Monogenea).

M F Diniz Baptista-Farias; A Kohn; S C Cohen

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PubMed · 10577717

Spermatogenesis and spermiogenesis in Microcotyle sp. (Microcotylidae, Monogenea).

M F Diniz Baptista-Farias·A Kohn·S C Cohen

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Abstract

Ultrastructural observations of spermatogenesis and spermiogenesis in Microcotyle sp. a microcotylid monogenean parasite from the gills of Hypostomus sp., are described. The spermatogonia were irregularly shaped, forming a peripheral layer of cells; spermatocytes were larger than spermatogonia and a nuclear synaptonemal complex was observed; young spermatids were joined by a central cytophore forming rosettes. Spermiogenesis was characterized by the outgrowth of a cytoplasmic protuberance, the zone of differentiation, containing the basal bodies, separated by an intercentriolar body, from which flagella grow out and fuse posteriorly with the median process. Cross sections of the anterior and the middle regions of spermatozoa revealed nuclei, mitochondria, peripheral microtubules, and paired axonemes each with a 9+1 pattern.

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Animals Catfishes Fish Diseases Male Microscopy, Electron Spermatogenesis Trematoda Trematode Infections Journal Article Research Support, Non-U.S. Gov't

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M F Diniz Baptista-Farias, A Kohn, S C Cohen. 1999. Spermatogenesis and spermiogenesis in Microcotyle sp. (Microcotylidae, Monogenea).. https://pubmed.ncbi.nlm.nih.gov/10577717/

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