Spermatozoal ultrastructure: Evolution and congruence with a holomorphological phylogeny of the oligochaeta (Annelida)

Jamieson B.G.M. (1983) Spermatozoal ultrastructure: Evolution and congruence with a holomorphological phylogeny of the oligochaeta (Annelida). Zoologica Scripta, 12 2: 107-114.

Author Jamieson B.G.M.
Title Spermatozoal ultrastructure: Evolution and congruence with a holomorphological phylogeny of the oligochaeta (Annelida)
Journal name Zoologica Scripta   Check publisher's open access policy
ISSN 0300-3256
Publication date 1983-01-01
Sub-type Article (original research)
Volume 12
Issue 2
Start page 107
End page 114
Total pages 8
Subject 1103 Clinical Sciences
Abstract Plesiomorph characters for the oligochaete spermatozoon are proposed. The chief trends from these plesiomorphies have been elongation of the acrosome and its tube; withdrawal of the primary acrosome vesicle and the axial rod into the acrosome tube and development of a capitulum; development of connectives, from the secondary tube to the axial rod (though there is some possibility that the reverse, absence of connectives, is plesiomorph); detorting and shortening of the midpiece (or possibly, again, the reverse) with an increase in numbers of mitochrondria from the plesiomorph four to eight; modification of the base of the tube to form a limen of variable form; and, in one line (lumbricids) flattening of the tip of the nucleus and correspondingly of the limen. Sperm ultrastructure, examined for 9 oligochaete families, corresponds well with taxonomic and phylogenetic groupings recently recognized by the author. However, convergent similarity of the phreodrilid sperm to that of the Lumbricina suggests a corresponding alteration of fertilization biology in the phreodrilids. The results indicate that the Haplotaxidae lie at the base of the opisthopores, though they do not unequivocally contraindicate acceptance of a Haplotaxis-like form as a stem form of the Haplotaxida (opisthopores and Haplotaxidae) and Tubificida. An even more basal position for prosopores, now represented by the Lumbriculida, cannot yet be dismissed.
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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