Spermiogenesis in the stag beetle, Aegus lavicollis Waterhouse (Coleoptera, Lucanidae), with special reference to the centriole adjunct

Miyoko Kubo-Irie, Ikuo Miura, Masaru Irie, Tohru Nakazawa, Hideo Mohri

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    Ultrastructural changes during spermiogenesis in the stag beetle, Aegus lavicollis, were studied with special attention to the organizing process of the centriole adjunct. In early spermatids the formation of acrosome and flagellum occurs simultaneously in the cytoplasm before nuclear condensation. The centriole adjunct first appears as a sheath surrounding a centriole in a concavity of the nucleus from which the flagellar axoneme is organized. A mass of electron-dense material accumulates progressively in the vicinity of the centriole. As nuclear transformation proceeds, electron-dense material is found at the posterior end of the nucleus and extends beyond the centriolar region to form a partial sheath around mitochondrial derivatives. Electron-dense material seems to contribute to the formation of the centriole adjunct because the former is closely attached to the latter until the latter is completely formed. In mature spermatozoa the centriole adjunct is characterized by its peculiar disposition, extending across about half the length of the flagellum and partly covering the outside of two mitochondrial derivatives.

    Original languageEnglish
    Pages (from-to)223-231
    Number of pages9
    JournalInvertebrate Reproduction and Development
    Volume37
    Issue number3
    Publication statusPublished - 2000 May

    Keywords

    • Centriole adjunct
    • Spermiogenesis
    • Stag beetle

    ASJC Scopus subject areas

    • Animal Science and Zoology
    • Cell Biology
    • Developmental Biology

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