Esteban O. Lavilla

A new species of Elachistocleis (Anura: Microhylidae) from the Andean Yungas of Argentina, with comments on the Elachistocleis ovalis - E. bicolor controversy

Elachistocleis skotogaster spec. nov. is described from the Andean Yungas of Argentina. It is unique in the genus in having belly and legs densely spotted with brown, an uniformly dark brown dorsal mottled with black, absence of alight vertebral strip, afold behind themouth but not apostcommisural gland. Itsnatural history and advertisement call are briee y noted. Elachistocleis ovalis and E.bicolor are considered different species, and Buenos Aires, Argentina, is established as type locality for the latter one.

Chondrocranium and visceral skeleton of Atelopus tricolor and Atelophryniscus chrysophorus tadpoles (Anura, Bufonidae)

Atelopus tricolor and Atelophryniscus chrysophorus have gastromyzophorous tadpoles. Aside from specific differences, the larval chondrocrania and visceral skeletons show several shared character states, including an almost quadrangular, open chondrocranium, cornua trabeculae with expanded tips, cartilago suprarostralis as a single element, a posteriorly projected arcus subocularis quadrati, a closed muscular tunnel, and a simplified branchial basket, with only three pairs of ceratobranchiales. They are compared with diverse character states of suctorial larvae considering them as causally related to the stream life adaptations. Atelopus tricolor y Atelophryniscus chrysophorus poseen larvas gastromizoforas. Dejando de lado las diferencias especificas, los condrocraneos y esqueletos hiobranquiales larvales comparten diversos estados de caracter, incluyendo el condrocraneo cuadrangular y abierto, los cuernos trabeculares con extremos expandidos, el cartilago suprarostral como elemento unico, el arco subocular proyectado hacia atras, el tunel muscular cerrado y la cestilla branquial simplificada, con solo tres pares de ceratobranquiales. Algunos de estos estados de caracter son comparados con aquellos de larvas suctoras considerados como causalmente relacionados a los habitats torrenticolas, para una mejor comprension de de la vida en ambientes de corriente rapida.

The tadpole of Pseudis minuta (Anura: Pseudidae), an apparent case of heterochrony

The external morphology, oral disc, and coloration pattern of the larva of Pseudis minuta are described. Tadpoles are mostly bottom dwellers that have a small, terminal oral disc with a labial tooth row formula 1(1-1)/(1-1)2. Internal oral anatomy is characterized using scanning electron microscopy, representing the only description available for the family Pseudidae. The coloration pattern of P. minuta tadpoles is compared with that of other pseudids. Pseudis minuta larvae do not exhibit the ontogenetic coloration change reported for P. paradoxa. Considering larval coloration, larval size, and reports of adult size, acceleration or hypermorphosis are suggested as possible heterochronic mechanisms involved in the evolution of Pseudis.

Herpetology at Kansas. A Centennial History. William E. Duellman

La revision de este libro fue escrita como respuesta a dos solicitudes casi simultaneas. Una la requeria para una revista periodica importante en America Latina (en este caso, Cuadernos de Herpetologia), y la otra para Herpetological Review. De este modo, donde quiera que usted lea este texto, esta advertido que la unica diferencia entre las dos versiones es el idioma en el que estan.