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Sperm morphology of five species of Colostethus (Anura, Dendrobatidae) from Brazil, with phylogenetic comments

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Veiga-Menoncello, A. C. P., Lima, A. P. and Recco-Pimentel, S. M. 2006. Sperm morphology of five species of Colostethus (Anura, Dendrobatidae) from Brazil, with phylogenetic comments. — Acta Zoologica (Stockholm) 87: 147–157

We describe the sperm ultrastructure of five species of Colostethus from Brazil. The general structures of the spermatozoa (acrosomal complex and flagellar apparatus) were similar to species within the Bufonoidea. Colostethus brunneus, Colostethus sp. (aff. trilineatus), Colostethus nidicola and Colostethus sp. had biflagellated spermatozoa, whereas the spermatozoa of Colostethus stepheni had a single flagellum, a characteristic previously unknown for this genus. In addition, the spermatozoa of this species showed some mitochondria within the thick, undulating membrane. These characteristics are apparently common to dendrobatid species that have a single flagellum. Based on these findings, we tentatively consider biflagellarity to be an apomorphic condition in the Dendrobatidae. In addition, the results described here do not support the proposed regrouping of the ‘brunneus’ and ‘alagoanus’ groups in a monophyletic ‘trilineatus’ group.
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Keywords: Anura; Colostethus; Dendrobatidae; spermatozoon; ultrastructure

Document Type: Research Article

Affiliations: 1: Departamento de Biologia Celular, Instituto de Biologia, Universidade Estadual de Campinas (UNICAMP), 13083-863 Campinas, SP, Brazil; 2: Instituto Nacional de Pesquisas da Amazônia (INPA), 69011-970 Manaus, AM, Brazil

Publication date: 2006-04-01

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