Title: Comparative ultrastructural study of spermiogenesis in monogeneans (flatworms)
Abstract: The mature spermatozoon of Heterocotyle is threadlike and uniflagellate; however, the spermiogenesis exhibits two axonemes. The early zone of differentiation of the spermatid contains two centrioles which produce two parallel axonemes, at first separated as two flagella, and later incorporated in the same cytoplasm. One of the two centrioles migrates forward. This centriole is continued as a 9 + "1" axoneme which will later become the principal axoneme of the mature spermatozoon. The other centriole produces a short 9 + "1" axoneme with an altered structure; this axoneme will later disappear. The spermatozoon consists of several regions: (a) at the anterior end, the centriolar derivative of the principal axoneme, (b) a short zone which shows cortical microtubules coinciding with external ornamentations and contains vestiges of the second centriole, (c) a long region containing the distal extremity of the principal axoneme and a mitochondrion, and (d) a posterior region containing only the nucleus with no accompanying cytoplasmic organelles. This paper is the first account of spermiogenesis of a monogenean uniflagellate spermatozoon.
Publication Year: 1983
Publication Date: 1983-09-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 46
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