Ultrastructure of the mature spermatozoa of caecilians (Amphibia : Gymnophiona)

Scheltinga, David M., Wilkinson, Mark, Jamieson, Barrie G.M. and Oommen, Oommen V. (2003) Ultrastructure of the mature spermatozoa of caecilians (Amphibia : Gymnophiona). Journal of Morphology, 258 2: 179-192. doi:10.1002/jmor.10139

Author Scheltinga, David M.
Wilkinson, Mark
Jamieson, Barrie G.M.
Oommen, Oommen V.
Title Ultrastructure of the mature spermatozoa of caecilians (Amphibia : Gymnophiona)
Journal name Journal of Morphology   Check publisher's open access policy
ISSN 1097-4687
Publication date 2003-11
Sub-type Article (original research)
DOI 10.1002/jmor.10139
Volume 258
Issue 2
Start page 179
End page 192
Total pages 14
Place of publication New York, N.Y. U.S.A.
Publisher Wiley-Liss Inc.
Collection year 2003
Language eng
Subject C1
270503 Animal Anatomy and Histology
771003 Living resources (flora and fauna)
Abstract The spermatozoa of Gymnophiona show the following autapomorphies: 1) penetration of the distal centriole by the axial fiber; 2) presence of an acrosomal baseplate; 3) presence of an acrosome seat (flattened apical end of nucleus); and 4) absence of juxta-axonemal fibers. The wide separation of the plasma membrane bounding the undulating membrane is here also considered to be apomorphic. Three plesiomorphic spermatozoal characters are recognized that are not seen in other Amphibia but occur in basal amniotes: 1) presence of mitochondria with a delicate array of concentric cristae (concentric cristae of salamander spermatozoa differ in lacking the delicate array); 2) presence of peripheral dense fibers associated with the triplets of the distal centriole; and 3) presence of a simple annulus (a highly modified, elongate annulus is present in salamander sperm). The presence of an endonuclear canal containing a perforatorium is a plesiomorphic feature of caecilian spermatozoa that is shared with urodeles, some basal anurans, sarcopterygian fish, and some amniotes. Spermatozoal synapornorphies are identified for 1) the Uraeotyphlidae and Ichthyophiidae, an 2) the Caeciliidae and Typhlonectidae, suggesting that the members of each pair of families are more closely related to each other than to other caecilians. Although caecilian spermatozoa exhibit the clear amphibian synapomorphy of the unilateral location of the undulating membrane and its axial fiber, they have no apomorphic characters that suggest a closer relationship to either the Urodela or Axiura. J. Morphol. 258:179-192, 2003. (C) 2003 Wiley-Liss, Inc.
Keyword Anatomy & Morphology
Tuatara Sphenodon-punctatus
Phylogenetic Considerations
Fertilization Biology
Hylid Frogs
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2004 Higher Education Research Data Collection
School of Biological Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
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Created: Tue, 14 Aug 2007, 19:15:40 EST