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Title: The biflagellate spermatozoa of Colostethus marchesianus (Melin, 1941) (Anura, Dendrobatidae) from the type locality and of Colostethus sp. (aff. Marchesianus.) from a different locality: A scanning and transmission electron microscopy analysis
Authors: Veiga-Menoncello, Ana Cristina Prado
Aguiar-Júnior, Odair
Lima, Albertina Pimental
Pimentel, Shirlei Maria Recco
Keywords: Evolution
Life History Trait
Microscopy, Electron, Scanning
Transmission Electron Microscopy
Colostethus Marchesianus
Issue Date: 2007
metadata.dc.publisher.journal: Zoologischer Anzeiger
metadata.dc.relation.ispartof: Volume 246, Número 1, Pags. 49-59
Abstract: Scanning and transmission electron microscopy and fluorochrome staining with DAPI were used to study the spermatozoa of Colostethus marchesianus from the type locality and Colostethus sp. (aff. marchesianus) from a different locality. The sperm cell of these species resembles those of most neobatrachian species, except for the presence of two complete flagella, a character previously described only for four unrelated anuran species belonging to the families Leptodactylidae, Rhacophoridae and Dendrobatidae. Although very similar, the spermatozoa described here showed slight differences in the length of their nucleus, in the extent of the subacrosomal cone over the nucleus, and in the curvature of the axial fiber seen in cross section. The absence of a juxtaxonemal fiber and the presence of a comma shaped axial fiber seem to be common characteristics of dendrobatid spermatozoa. The minor differences found in our study may indicate that the taxa studied here are distinct species. The evolutionary significance of spermatozoa biflagellarity is still unclear, although the presence of this trait in unrelated groups suggests independent origins. © 2007 Elsevier GmbH. All rights reserved.
metadata.dc.identifier.doi: 10.1016/j.jcz.2006.12.001
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