The ultrastructure of the spermatozoon of Haplotaxis ornamentus (Annelida, Oligochaeta, Haplotaxidae) and its phylogenetic significance

Jamieson B.G.M. (1982) The ultrastructure of the spermatozoon of Haplotaxis ornamentus (Annelida, Oligochaeta, Haplotaxidae) and its phylogenetic significance. Zoomorphology, 100 3: 177-188. doi:10.1007/BF00311971


Author Jamieson B.G.M.
Title The ultrastructure of the spermatozoon of Haplotaxis ornamentus (Annelida, Oligochaeta, Haplotaxidae) and its phylogenetic significance
Journal name Zoomorphology   Check publisher's open access policy
ISSN 0720-213X
Publication date 1982-01-01
Sub-type Article (original research)
DOI 10.1007/BF00311971
Open Access Status Not yet assessed
Volume 100
Issue 3
Start page 177
End page 188
Total pages 12
Publisher Springer-Verlag
Subject 2702 Anatomy
1103 Clinical Sciences
Abstract The spermatozoon of Haplotaxis ornamentus has characteristics common to all oligochaete sperm: filiform; primary acrosome vesicle carried on an acrosome tube and containing an axial rod (perforatorium) in an invagination (subvesicular space or secondary acrosomal invagination); an elongate, highly condensed cylindrical nucleus followed by a cylindrical midpiece of radially adpressed mitochondria not penetrated by the axoneme; a single (distal) centriole persistent, though modified, at maturity; axoneme with 9 doublets, each with two outer glycogen granules, and centrally two singlets accompanied by two solid fibres. A peculiar haplotaxid combination of characters (none unique) is slight withdrawal of the primary vesicle into the acrosome tube with a strongly emergent capitulate axial rod and moderately short midpiece. This ultrastructure is consistent with location of the Haplotaxidae at the base of the Haplotaxida (Haplotaxina - Alluroidina - Moniligastrina - Lumbricina). Tubificida sperm, although also plesiomorph for the Oligochaeta, have the autapomorphy elongate periaxial sheath (secondary tube), excepting the Phreodrilidae whose sperm show convergent resemblances to the Lumbricina. The term annuloid has been introduced for annulus-like structures of varied origins.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

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