Proacrosome and acrosome of the spermatozoon in Acanthobdella peledina (Annelida: Clitellata)

Autor(en): Westheide, W
Purschke, G 
Stichwörter: Acanthobdella; acrosome; Branchiobdellidae; Clitellata; COMPARATIVE ULTRASTRUCTURE; Hirudinea; OLIGOCHAETA; phylogeny; Reproductive Biology; SPERMIOGENESIS; Zoology
Erscheinungsdatum: 1996
Herausgeber: INT SCIENCE SERVICES/BALABAN PUBLISHERS
Journal: INVERTEBRATE REPRODUCTION & DEVELOPMENT
Volumen: 29
Ausgabe: 3
Startseite: 223
Seitenende: 230
Zusammenfassung: 
Proacrosome and acrosome of the primitive leech Acanthobdella peledina are described by means of transmission electron microscopy. The proacrosome develops in early spermatids and has the shape of a pot-bellied urn with an opening towards the nucleus. Its wall is formed by a thin vesicle. In its interior, many sections of tubular structures are visible. This urn is seated atop a short, electron-dense tube. The resultant acrosome is unusually elongated, with a helically coiled acrosomal tube forming its base. Above the tube the thin acrosomal vesicle encloses a central space, within which is the acrosomal rod. The acrosomal structures clearly indicate a sister-group relationship to the Euhirudinea, but do not corroborate the notion of close kinship with the Branchiobdellidae.
ISSN: 01688170
DOI: 10.1080/07924259.1996.9672516

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