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	Provedor de dados Neotropical Ichthyology (2) Autor Calcagnotto,Daniela (2) Quagio-Grassiotto,Irani (2) Santana,Júlio César de O. (2) Netto-Ferreira,André L. (1) Palavra-chave Ostariophysi (2) Spermatozoa (2) Systematics (2) Ultrastructure (2) African Fish (1) Neotropical Fish (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2014 (1) 2013 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Sperm evolution in the family Alestidae with comparative data for the genus Chalceus (Ostariophysi: Characiformes) Neotropical Ichthyology Santana,Júlio César de O.; Calcagnotto,Daniela; Quagio-Grassiotto,Irani. Spermiogenesis and spermatozoa in six genera of the African family Alestidae plus the Neotropical genus Chalceusare described. Spermiogenesis is quite similar in all Alestidae and is identified as Type I and its variants. In Type I spermiogenesis, the flagellum of earliest spermatids lies lateral to the nucleus, and rotation of the nucleus towards the centriolar complex is observed. Nuclear rotation is complete reaching 90 degrees in Bryconalestes longipinnis, Brachypetersius altus, Brycinus imberi, B. lateralis, and Alestopetersius compressus; and is incomplete reaching 20 degrees in Micralestes acutidensand Rhabdalestesrhodesiensis. Spermatozoa morphology varies from a medial nucleus with fibrillar chromatin in the most basal genus Brycinusto a strongly... Tipo: Info:eu-repo/semantics/article Palavras-chave: African Fish; Ostariophysi; Spermatozoa; Systematics; Ultrastructure. Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000200419 Sperm characteristics as additional evidence of close relationship between Lebiasina and Piabucina (Characiformes: Lebiasinidae: Lebiasininae) Neotropical Ichthyology Santana,Júlio César de O.; Netto-Ferreira,André L.; Calcagnotto,Daniela; Quagio-Grassiotto,Irani. Spermiogenesis and spermatozoa of representatives of the genera Lebiasina and Piabucinaare described. Spermiogenesis is quite similar among all analyzed species of these genera and is identified as Type II. In this type of spermiogenesis, the flagellum of earliest spermatids lies lateral to the nucleus. A slight movement of the nucleus towards the centriolar complex is observed. In late spermatids, the nucleus slightly elongates towards the flagellum. The formation of two striated rootlets apparently occurs in early/intermediate spermatids. The spermatozoa of species of Lebiasinaand Piabucina share (1) a drop-shaped slightly elongated nucleus that is laterally positioned relative to the flagellum; (2) a superolateral centriolar complex; (3) two striated... Tipo: Info:eu-repo/semantics/article Palavras-chave: Ostariophysi; Neotropical Fish; Spermatozoa; Systematics; Ultrastructure. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300573 Registros recuperados: 2 Primeira ... 1 ... Última

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