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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/34044
Title: 
Occurrence of biflagellate spermatozoa in Cetopsidae, Aspredinidae, and Nematogenyidae (Teleostei : Ostariophysi : Siluriformes)
Author(s): 
Institution: 
  • Faculdade de Medicina de Marília (FAMEMA)
  • Universidade Estadual de Campinas (UNICAMP)
  • Universidade Estadual Paulista (UNESP)
ISSN: 
0720-213X
Abstract: 
In the present study spermiogenesis was investigated in Cetopsis coecutiens (Cetopsidae), and Bunocephalus amazonicus (Aspredinidae), while spermatozoa ultrastructure was investigated in C. coecutiens, B. amazonicus, and Nematogenys inermis (Nematogenyidae). Aspredinidae and Cetopsidae share a spermatogenesis of the semicystic type, and a particular type of spermiogenesis process not reported in any fish group. In the three species analyzed, spermatozoa are biflagellate with flagella having the classical axoneme formulae (9 + 2). The analysis of thirteen characters showed the presence of eight characters shared by Cetopsidae and Aspredinidae, and six characters shared by Cetopsidae and Nematogenyidae, which may suggest that these three families may be more related than actually hypothesized, comprising a very primitive siluriform lineage originated after Diplomystidae.
Issue Date: 
1-Aug-2006
Citation: 
Zoomorphology. New York: Springer, v. 125, n. 3, p. 135-145, 2006.
Time Duration: 
135-145
Publisher: 
Springer
Keywords: 
  • fish evolution
  • catfish
  • sperm
  • semicystic spermatogenesis
  • morphology
Source: 
http://dx.doi.org/10.1007/s00435-006-0018-9
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/34044
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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