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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Sperm evolution in the family Alestidae with comparative data for the genus Chalceus (Ostariophysi: Characiformes)

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Author(s):
Júlio César de O. Santana [1] ; Daniela Calcagnotto [2] ; Irani Quagio-Grassiotto [3]
Total Authors: 3
Affiliation:
[1] Universidade Estadual de Campinas. Programa de Pós-Graduação em Biologia Celular e Estrutural - Brasil
[2] Univ Sao Paulo, Inst Biociencias, Dept Genet & Biol Evolut, BR-05508900 Sao Paulo - Brazil
[3] Univ Estadual Paulista Julio de Mesquita Filho UN, Inst Biociencias, Dept Morfol, BR-18618970 Botucatu, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Neotropical Ichthyology; v. 12, n. 2, p. 419-427, 2014-06-00.
Abstract

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 eccentric nucleus with highly condensed chromatin in the more derived Rhabdalestesand Micralestes. Chalceushas a very similar spermatozoon to that found in Brycinussharing the fibrillar aspect of the chromatin in the nucleus. This feature is so far only observed in these two genera among African and Neotropical characiform fishes. (AU)

FAPESP's process: 10/01626-2 - Analysis of ultrastructural characteristics of spermiogenesis and spermatozoa of representatives of the superfamily Erythrinoidea (Teleostei: Characiformes): a phylogenetic approach
Grantee:Júlio César de Oliveira Santana
Support Opportunities: Scholarships in Brazil - Doctorate