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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/12916

Title: Spermatogenesis and the structure of the testes in Nemertodermatida
Authors: Boone, Mieke
Bert, Wim
Claeys, Myriam
Houthoofd, Wouter
Artois, Tom
Issue Date: 2011
Publisher: SPRINGER
Citation: ZOOMORPHOLOGY, 130(4), p. 273-282
Abstract: The ultrastructure of the testes in two representatives of the enigmatic taxon Nemertodermatida was studied using transmission electron microscopy. Nemertoderma westbladi has paired testes, which are delineated by lining cells. Within each testis, different follicles, each surrounded by a membrane-like structure, are found. Flagellophora apelti has genuinely follicular testes, consisting of several follicles, each containing a certain stage of spermatogenesis. As the gametes are not enclosed by a structure that can be called a true gonad, the structure of the testes differs from most bilaterian animals, but resembles the organization of gametogenic areas of ctenophores. Each stage of spermatogenesis in F. apelti is described, enabling the inference of the origin of the structures seen in mature spermatozoa. The overall structure of the mature spermatozoa is similar in all nemertodermatids and unique within the Metazoa: an elongated head containing the nucleus; a middle piece containing an axoneme, mitochondrial derivatives and in F. apelti granular derivatives; and a flagellar tail.
Notes: [Boone, Mieke; Bert, Wim; Claeys, Myriam; Houthoofd, Wouter] Univ Ghent, Dept Biol, Nematol Unit, B-9000 Ghent, Belgium. [Artois, Tom] Hasselt Univ, Ctr Environm Sci, Res Grp Zool Biodivers & Toxicol, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/12916
DOI: 10.1007/s00435-011-0137-9
ISI #: 000297136000004
ISSN: 0720-213X
Category: A1
Type: Journal Contribution
Validation: ecoom, 2012
Appears in Collections: Research publications

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