Dendropsophini is the most species-rich tribe within Hylidae with 234 described species. Although cytogenetic information is sparse, chromosome numbers and morphology have been considered as an important character system for systematic inferences in this group. Using a diversity of standard and molecular techniques, we describe the previously unknown karyotypes of the genera Xenohyla, Scarthyla...

The frog clade Neobatrachia or “advanced frogs” represents more than 95% of the diversity within Anura. neobatrachian fossil record is incomplete due to small size and fragile nature their bones but provides some clues on time rate current diversification modern-day amphibians. Crato Formation (Aptian) northeastern Brazil known for presence of, at least, five species fossils. Herein, we describ...

The structure of the adrenal tissue was investigated by both histological and histochemical techniques. It is shown that the adrenal contains 4 types of tissues; these are named the steroid, Stilling, lymphoid, and chromaffin tissues. The structure of the adrenal in the bullfrog does not provide any evidence to support a theory of zonation within the cortical tissue of the Anura, as suggested b...

En Colombia, los anfibios se posicionan como uno de grupos vertebrados con mayor riqueza taxonómica, y una alta representatividad especies endémicas. últimos años, las colecciones regionales han contribuido a llenar vacíos información sobre la biogeografía, variación intra e interespecífica sistemática del país. este trabajo presentamos 1533 registros depositados en Colección Anfibios Museo His...

The hylid tribe Cophomantini is a diverse clade of Neotropical treefrogs composed of the genera Aplastodiscus, Boana, Bokermannohyla, Hyloscirtus, and Myersiohyla. The phylogenetic relationships of Cophomantini have been comprehensively reviewed in the literature, providing a suitable framework for the study of chromosome evolution. Employing different banding techniques, we studied the chromos...

Postembryonic skeletal development of the pipid frog Xenopus laevis is described from cleared-and-stained whole-mount specimens and sectioned material representing Nieuwkoop and Faber developmental Stages 46-65, plus postmetamorphic individuals up to 6 months old. An assessment of variation of skeletogenesis within a single population of larvae and comparison with earlier studies revealed that ...

The validity of the published description of Hyla rufitela is questioned because the origin of the described tadpoles does not correspond to the distribution of this species. The present description, based on tadpoles that were hatched from two egg masses from the Caribbean lowland of Costa Rica, includes tadpoles raised to adult frogs to verify the species. The newly described tadpoles differ ...

Pore-linked filaments were visualized in spreads of anuran spermatocyte nuclei using transmission electron microscope. We used Odontophrynus diplo and tetraploid species having the tetraploid frogs reduced metabolic activities. The filaments with 20-40 nm width are connected to a ring component of the nuclear pore complex with 90-120 nm and extend up to 1 microm (or more) into the nucleus. The ...