Pattern of Gonadal Sex Differentiation, Development, and Onset of Steroidogenesis in the Frog, Rana curtipes

Gramapurohit, Narahari P.; Shanbhag, Bhagyashri A.; Saidapur, Srinivas K.

doi:10.1006/gcen.2000.7513

Cited by 37 publications

(59 citation statements)

References 20 publications

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“…Our findings show that gonad differentiation in P. platensis occurs in a manner similar to that of most other anurans (e.g., Lopez, 1989;Gramapurohit et al, 2000;Ogielska and Kotusz, 2004), but with an accelerated pattern of differentiation (see Fig. 8).…”

Section: Gonad Differentiationmentioning

confidence: 67%

“…Ogielska and Kotusz (2004) mentioned that the differentiation of oocytes in developing ovaries has its own timing, independent of somatic development. However, large tadpoles and long larval developmental time are features shared by taxa having an accelerated rate of ovarian development, such as Pseudis spp., Pelophylax spp., and Clinotarsus curtipes (Gramapurohit et al, 2000;Ogielska and Kotusz, 2004;Downie et al, 2009).…”

Section: Gonad Differentiationmentioning

confidence: 93%

“…Downie et al (2009) described ovaries with large previtellogenic oocytes in later tadpoles of Pseudis paradoxa. Besides, the accelerated ovarian development has been recorded at the end of the metamorphosis for Pelophylax lessonae and P. ridibundus (formerly Rana, Frost et al, 2006), and Clinotarsus curtipes (formerly Rana curtipes; Frost et al, 2006) as it was mentioned by Ogielska and Kotusz (2004) and Gramapurohit et al (2000).…”

Section: Gonad Differentiationmentioning

confidence: 97%

“…Pseudis platensis exhibits a pattern of gonadal differentiation in which the testes differentiate initially into ovaries irrespective of the genetic sex, and later the ovaries in genetic males transform into testes (Gramapurohit et al, 2000). The onset of testicular formation in P. platensis is associated with the degeneration of oocytes at the beginning of metamorphosis, as in Rhacophorus arboreus (Tanimura and Iwasawa, 1989).…”

Section: Gonad Differentiationmentioning

confidence: 97%

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The ontogeny of Pseudis platensis (Anura, Hylidae): Heterochrony and the effects of larval development on postmetamorphic life

Fabrezi

Quinzio

Goldberg

2009

Journal of Morphology

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Recent studies have described the giant tadpole, delayed metamorphic transformations, and absence of postmetamorphic growth of the skeleton of Pseudis Platensis. These features address questions about derived patterns of life cycles and the role of the heterochrony during the metamorphosis in anurans. Using anatomical methods, we provide new data on the development of reproductive, digestive and integument systems, and age inference obtained from ontogenetic series of Pseudis platensis. Our results indicate that at the end of metamorphosis, the adult skin is completely differentiated, including the calcified dermal layer; the testis has seminiferous tubules with spermatogonia, spermatocytes, and spermatids; ovarian sacs present previtellogenic ova; and the adult digestive tract is fully formed. The froglets differ from adults only in being unable to reproduce. The entire life cycle of P. platensis can occur in 4 years. In the first year, larval development, growth to adult size, and gonad differentiation are completed. Long larval development rather than size of the tadpoles seems to be involved in the absence of juvenile stages.

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Section: Gonad Differentiationmentioning

confidence: 67%

Section: Gonad Differentiationmentioning

confidence: 93%

Section: Gonad Differentiationmentioning

confidence: 97%

Section: Gonad Differentiationmentioning

confidence: 97%

See 2 more Smart Citations

The ontogeny of Pseudis platensis (Anura, Hylidae): Heterochrony and the effects of larval development on postmetamorphic life

Fabrezi

Quinzio

Goldberg

2009

Journal of Morphology

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show abstract

“…In addition, some amphibians are known to have hermaphroditic characteristics during phases of their natural reproductive development. In particular, testicular oocytes have been reported to be a natural developmental occurrence in some strains of ranid species, including, but not limited to, Rana temporaria (Witschi, 1929), Rana catesbeiana (Hsu & Liang, 1970), and Rana curtipes (Gramapurohit et al, 2000). In addition, Bufonid toads, whether genetic males or genetic females, develop ovaries, which become compressed into the Bidder's organs in front of the definitive gonad at the time of metamorphosis (Wallace et al, 1999).…”

Section: Discussionmentioning

confidence: 99%