Testicular morphology of vertebrate testis indicates requirement of local control. In urodeles,
the testis is organized in lobes of increasing maturity throughout the cephalocaudal axis …

Testes in Anura are paired spherical or ovoid organs lying on the ventral side of kidneys.
They are usually situated near the medial anterior part of the kidneys. Each testis is …

This book deals with reproduction of Amphibians belonging to three extant orders:
Caecilians, Salamanders, Frogs and Toads. Separate chapters have been written for males …

Rana esculenta specimens were collected, during the last 13 years, in well‐defined areas
around Naples. The annual ovarian cycle shows distinct phases of recrudescence (starting …

In this study, the measurement both of peripheral gonadotropins (FSH and LH) and of sex
steroids in male and female wild anuran, Rana esculenta, was performed during the annual …

1. Androgen, 17beta-estradiol and corticosterone levels were measured by RIA in plasma of
Rana esculenta frogs sampled in the field and in the laboratory. 2. Androgen and 17beta …

Rhinella arenarum is a South American toad with wide geographic distribution. Testes of this
toad produce high amount of androgens during the non reproductive season and shift …

Abstract The Mexican leaf frog, Pachymedusa dacnicolor, an inhabitant of the semiarid,
subtropical Mexican lowlands, displays a well-defined seasonal testicular cycle. Testis …

Primary spermatogonia have highly lobate nuclei and can be distinguished as pale and dark
types on the basis of nuclear and cytoplasmic features. Nuclei of secondary spermatogonia …

Male boreal toads (Bufo boreas) are thought to return to the breeding site every year but, if
absent in a particular year, will be more likely to return the following year. Using Pollock's …