Spermiogenesis in the Oligochaetoid Polychaete Questa (Annelida, Questidae)

Jamieson B.G.M. (1983) Spermiogenesis in the Oligochaetoid Polychaete Questa (Annelida, Questidae). Zoologica Scripta, 12 3: 179-186. doi:10.1111/j.1463-6409.1983.tb00563.x


Author Jamieson B.G.M.
Title Spermiogenesis in the Oligochaetoid Polychaete Questa (Annelida, Questidae)
Journal name Zoologica Scripta   Check publisher's open access policy
ISSN 0300-3256
Publication date 1983
Sub-type Article (original research)
DOI 10.1111/j.1463-6409.1983.tb00563.x
Volume 12
Issue 3
Start page 179
End page 186
Total pages 8
Subject 1103 Clinical Sciences
Abstract The spermatids are connected to a central cytophore by cytoplasmic bridges and are polarized in the sequence: "empty cytoplasm"; uncondensed nucleus; mitochondria which surround the distal region of the nucleus and the centrioles; axoneme; posterolateral to the base of the axoneme, the Golgi apparatus and (when secreted) the acrosomal rudiment. The dome-shaped acrosome vesicle elongates progressively as it migrates to the tip of the elongating and condensing nucleus; subacrosomal material gives rise to an almost equally long, tubular, thick-walled perforatorium. After the acrosome has greatly elongated, the mitochondria are reduced to two, which lose their rounded form and invest the growing axoneme to give a very elongate midpiece. Transfer of materials from nucleus to mitochondria is discussed. Microtubules surrounding the acrosome and nucleus disappear by maturity, but those internal to the mitochrondria apparently persist as the accessory microtubules, unique in the Annelida, which surround the 9 + 2 axoneme. Microvilli of the egg envelope, which have tetrads of terminal branches (epivitelline projections) resembling epicuticular projections, are less than 1 μm long, whereas the mature acrosome exceeds 5 μm. This suggests that the correlation seen in oligochaetes is absent.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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