Spermatology of the genus Lepidodasys Remane, 1926 (Gastrotricha, Macrodasyida): towards a revision of the family Lepidodasyidae Remane, 1927
Articolo
Data di Pubblicazione:
2004
Citazione:
Spermatology of the genus Lepidodasys Remane, 1926 (Gastrotricha, Macrodasyida): towards a revision of the family Lepidodasyidae Remane, 1927 / L. GUIDI, L. PIERBONI, M. FERRAGUTI, M.A. TODARO, M. BALSAMO. - In: ACTA ZOOLOGICA. - ISSN 0001-7272. - 85:4(2004), pp. 211-221.
Abstract:
The spermatozoa of Lepidodasys unicarenatus
and Lepidodasys sp. are filiform and composed of a cork-screw shaped acrosome, a helical nucleus surrounding a mitochondrial axis, and a 9 × 2 + 2 flagellum as in the basic structural model of the macrodasyidan sperm. The genus Lepidodasys has a debated phylogenetic position and has been linked in turn to the family Lepidodasyidae and the
family Thaumastodermatidae. The sperm features of the two Lepidodasys species examined are distinct from those typical of the two families: the absence of the periaxonemal cylinder, a character shared only with Turbanellidae among Macrodasyida, could be considered as a symplesiomorphy, suggesting a basal position of the genus along the Macrodasyida clade. Moreover, a
comparison of the spermatogenic process of
Lepidodasys sp. with those of Acanthodasys aculeatus (Thaumastodermatidae) and Cephalodasys maximus (Lepidodasyidae) has revealed that the process of acrosome formation and nuclear morphology during spermatogenesis are peculiar in Lepidodasys
sp. and differences are evident especially in the late stages of spermatogenesis.
Penetrated spermatozoa were observed in the oocytes at all maturation stages
in L. unicarenatus.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Lepidodasys, Gastrotricha, spermatogenesis,
spermatozoa, ultrastructure, phylogeny
Elenco autori:
L. GUIDI, L. PIERBONI, M. FERRAGUTI, M.A. TODARO, M. BALSAMO
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