Observations on the ultrastructure of spermatids in the testis of <i>Chiromantis xerampelina</i> (Anura: Rhacophoridae)

Mainoya, J. R.

doi:10.1111/j.1365-2028.1981.tb01074.x

Cited by 17 publications

(24 citation statements)

References 2 publications

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“…This feature differs markedly from the condition seen in ranoids such as Ranidae ( Poirier & Spink, 1971;Pugin-Rios, 1980 andYoshizaki, 1987) and Rhacophoridae ( Mainoya, 1981, Mizuhira et al, 1986and Jamieson, 1999, where the acrosome vesicle sits on top of the nucleus and the subacrosomal cone is absent. Similarly, the subacrosomal cone is also absent in some archaeobatrachians, such as Pelobatidae ( James, 1970) and Pipidae ( Reed & Stanley, 1972;Bernardini et al, 1986).…”

Section: Discussionmentioning

confidence: 72%

The ultrastructure of the spermatozoa of Epipedobates flavopictus (Amphibia, Anura, Dendrobatidae), with comments on its evolutionary significance

et al. 2002

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We describe, for the first time, the spermatozoon ultrastructure of a dendrobatid frog, Epipedobates flavopictus. Mature spermatozoa of E. flavopictus are filiform, with a moderately curved head and a proportionally short tail. The acrosomal vesicle is a conical structure that covers the nucleus for a considerable distance. A homogeneous subacrosomal cone lies between the acrosome vesicle and the nucleus. The nucleus contains a nuclear space at its anterior end, and electron-lucent spaces and inclusions. No perforatorium is present. In the midpiece, the proximal centriole is housed inside a deep nuclear fossa. Mitochondria are scattered around the posterior end of the nucleus and inside the undulating membrane in the anterior portion of the tail. In transverse section the tail is formed by an U-shaped axial fiber connected to the axoneme through an axial sheath, which supports the undulating membrane. The juxta-axonemal fiber is absent. The spermatozoon of E. flavopictus has several characteristics not observed before in any anurans, such as a curved axial fiber, absence of a juxta-axonemal fiber, and presence of mitochondria in the typical undulating membrane. Our results endorse the view that, in anurans, the conical perforatorium and subacrosomal cone are homologous and that Dendrobatidae should be grouped within Bufonoidea rather than Ranoidea.

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Section: Discussionmentioning

confidence: 72%

The ultrastructure of the spermatozoa of Epipedobates flavopictus (Amphibia, Anura, Dendrobatidae), with comments on its evolutionary significance

et al. 2002

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“…In the Chilean leptodactylid Telmatobufo australis, the presence of two flagella was inferred to be a primitive characteristic related to the fertilization environment, although the exact mode of fertilization of this species was unknown (Pugin-Rios and Garrido, 1981). Mainoya (1981) indicated that anurans may have sperm tails with either one or two flagella and erroneously cited Nicander (1970), who mentioned no case of biflagellarity in anurans. Lee and Jamieson (1993) argued for a general trend towards the simplification of sperm among the Anura (see also Jamieson et al, 1993) and suggested that the biflagellarity in Rhacophorus (Rhacophoridae), Scaphiophus (Pelobatidae), and Telmatobufo (Leptodactylidae) was apomorphic.…”

Section: Discussionmentioning

confidence: 96%

Biflagellate spermatozoon of the poison‐dart frogsepipedobates femoralisandcolostethussp. (anura, dendrobatidae)

Aguiar

Garda

Lima

et al. 2002

Journal of Morphology

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This study describes the spermatozoa of the dendrobatids Epipedobates femoralis and Colostethus sp. using light and transmission electron microscopy. Both species possess a biflagellate spermatozoon, an unusual characteristic only previously reported in two anuran species belonging to the families Leptodactylidae and Racophoridae. The acrosomal complex of both species consists of a conical acrosomal vesicle and a subacrosomal cone, both of which cover the anterior portion of the nucleus, but to differing extents. In the midpiece, the centrioles are disposed parallel to each other and to the cell axis and give rise to two axonemes. Two paraxonemal rods were also seen entering the nuclear fossa. Both flagella are surrounded by a single mitochondrial collar. Each flagellum is formed by an axial fiber connected to the axoneme by an axial sheath; juxta-axonemal fibers are absent. Our data seem to support that Epipedobates femoralis should be placed in a separate clade possibly related to Colosthetus and that these two genera may not be monophyletic.

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“…If a single tail fiber involves two flagellar components as indicated in the present study, it seems not essential to separate "twoflagellated" from "single-flagellated" species, until further studies reveal that each of the two "flagellas" contains an axoneme . Several rhacophorid genera have been proven to contain actually two flagellar apparatuses (axonemes) in a single tail fiber (Mainoya, 1981;Mizuhira et al, 1986). Although most hylid spermatozoa lack an undulating membrane, Rostogi et al (1988) reported spermatozoa with an undulating membrane in Pachymedusa dacnicolor.…”

Section: Resultsmentioning

confidence: 99%

Spermatozoa of Several Frog Species from Japan and Adjacent Regions

Kuramoto

1998

Jpn.J.Herpetol.

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Sperm shape and size of a total of 25 frog species belonging to five families are described. Spermatozoa of Bombina orientalis were peculiar in having a ventral undulating membrane. Its shape was similar to that of B. bombina, but differed from that of B. variegata. Three species of the genus Bufo had spermatozoa with an elongated head and a tail equipped with an undulating membrane. Spermatozoa of two species of the genus Hyla had a crescent-like head, and it was observed that the tail contains two flagellar units, presumably an axoneme and an axial rod. In all the above taxa, mitochondrial spheres were observed at the base of the tail, where they usually constituted a middle piece. Most species of the genus Rana had spermatozoa with a cylindrical head and a simple thin tail, but three species of the Rana narina complex and R. ishikawae had a very long sperm head. In the latter four species, mitochondrial spheres were evident at the neck region. Platymantis pelewensis had also slender spermatozoa. Spermatozoa of Microhyla ornata had a cone-shaped head and a distinct middle piece. These findings are compared with previous studies, and several taxonomic implications are discussed.

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Observations on the ultrastructure of spermatids in the testis of Chiromantis xerampelina (Anura: Rhacophoridae)

Cited by 17 publications

References 2 publications

The ultrastructure of the spermatozoa of Epipedobates flavopictus (Amphibia, Anura, Dendrobatidae), with comments on its evolutionary significance

The ultrastructure of the spermatozoa of Epipedobates flavopictus (Amphibia, Anura, Dendrobatidae), with comments on its evolutionary significance

Biflagellate spermatozoon of the poison‐dart frogsepipedobates femoralisandcolostethussp. (anura, dendrobatidae)

Spermatozoa of Several Frog Species from Japan and Adjacent Regions

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