Ultrastructure of spermiogenesis in Vampyroteuthis infernalis Chun - a relict cephalopod mollusc

Healy J.M. (1990) Ultrastructure of spermiogenesis in Vampyroteuthis infernalis Chun - a relict cephalopod mollusc. Helgoländer Meeresuntersuchungen, 44 1: 95-107. doi:10.1007/BF02365433


Author Healy J.M.
Title Ultrastructure of spermiogenesis in Vampyroteuthis infernalis Chun - a relict cephalopod mollusc
Journal name Helgoländer Meeresuntersuchungen   Check publisher's open access policy
ISSN 0174-3597
Publication date 1990-01-01
Sub-type Article (original research)
DOI 10.1007/BF02365433
Open Access Status Not yet assessed
Volume 44
Issue 1
Start page 95
End page 107
Total pages 13
Publisher Springer-Verlag
Subject 2300 Environmental Science
1900 Earth and Planetary Sciences
Abstract Spermiogenesis in the relict deep-sea cephalopod Vampyroteuthis infernalis Chun is examined using transmission electron microscopy (TEM), and the results compared with available data on other cephalopods. Early spermatids of Vampyroteuthis exhibit an ovoid nucleus (with dense irregular patches), numerous mitochondria and a pair of triplet substructure centrioles (arranged parallel to each other). Subsequently, the following morphological changes take place: (1) nuclear contents condense into a fibrous reticulum, then into thick fibres; (2) the acrosomal vesicle (presumably Golgi-derived) positions itself in a shallow depression at the nuclear apex; (3) the flagellum forms from one of the two centrioles; (4) mitochondria cluster around the flagellum at the base of the nucleus; (5) a dense, fibrous plug forms within the basal invagination of the nucleus. Microtubules surround the acrosome and condensing nucleus of spermatids. The dense plug is of special systematic importance since it also occurs in spermatids and spermatozoa of Octopus spp., but not in any investigated species of the Sepiida, Sepiolida or Teuthida. Late spermatids and mature spermatozoa of Vampyroteuthis strongly resemble developing spermatids of Octopus, suggesting a close phylogenetic relationship between Vampyroteuthis (and the Vampyromorpha) and octopods.
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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