Comparative sperm morphology of Proceratophrys and Odontophrynus (Anura, Odontophrynidae).

The ultrastructure of the spermatozoa of seven species of Proceratophrys and one of Odontophrynus was analyzed in the present study. The sperm of Odontophrynus juquinha is similar to that of Odontophrynus cultripes, previously described, and to those of Proceratophrys branti, Proceratophrys bigibbosa, Proceratophrys affinis concavitympanum, Proceratophrys huntingtoni, Proceratophrys conformis moratoi, P. moratoi, and Proceratophrys palustris, in relation to the acrosomal vesicle and the subacrosomal cone that covers the anterior region of the nucleus in the sperm head.

Comparative sperm ultrastructure of twelve leptodactylid frog species with insights into their phylogenetic relationships.

The spermatozoa of representatives of three Neotropical frog subfamilies, Leiuperinae, Leptodactylinae and Paratelmatobiinae, were observed using Transmission Electron Microscopy, with the aim of identifying ultrastructural traits that provide insights into the phylogenetic relationships among these anurans, which are currently unclear. In the leiuperines, spermatozoa of Physalaemus albifrons, P. cicada, P.

Ultrastructure variation in the spermatozoa of Pseudopaludicola frogs (Amphibia, Anura, Leptodactylidae), with brief comments on its phylogenetic relevance.

The taxonomic history of the small frogs of the genus Pseudopaludicola from South America has been controversial. Phylogenetic inferences based on molecular data have identified four Pseudopaludicola clades, correlating with the known variation in karyotypes (2n = 22, 20, 18, and 16). In this study, the ultrastructure of the spermatozoa was analyzed in 12 species of the Pseudopaludicola, with the aim of describing their morphology and identifying characters that may contribute to a better understanding of the phylogenetic relationships.