3 research outputs found
Descripción de la oogénesis en siete especies de cecílidos de Ecuador
En el orden Gymnophiona la oogénesis ha sido descrita para nueve especies; de estas, sólo una está presente en el Ecuador y ninguna pertenece al género Caecilia, el más especioso del orden. Para este estudio, se realizaron cortes histológicos y tinción de eosina-hematoxilina en ovarios extraídos de especímenes de museo, así como también de animales vivos. Los tejidos fueron analizados por medio de micrografías y se compararon las características con estudios previos. Se determinaron cinco estadios en la oogénesis para las siete especies estudiadas, considerando características del folículo como el tamaño, morfología y las membranas que lo rodean. Las especies reflejan diferentes tamaños máximos de oocitos y diferencias en las propiedades celulares de los folículos. Se encontró modularidad y heterocronía en la oogénesis en comparación con las especies previamente descritas
Rediscovery of the Endangered Carchi Andean Toad, Rhaebo colomai (Hoogmoed, 1985), in Ecuador, with comments on its conservation status and extinction risk
Since 1984 there have been no records of Rhaebo colomai (Hoogmoed, 1985) within the territory of Ecuador. This species was known from 2 localities in the province of Carchi, northwestern Ecuador, and the department of Nari��o, southwestern Colombia, which were reported in 1979 and 2015, respectively. We report the recent sightings of R. colomai at 3 new localities in Ecuador and discuss and evaluate this species��� extinction risk and conservation status
Egg burying behaviour in Pristimantis highlights the link between direct development and specialised parental care
Abstract One of the most extreme adaptations to terrestriality in anurans is direct development, where eggs from terrestrial clutches entirely circumvent an aquatic tadpole stage and directly develop into small froglets. We here report the first case of egg‐burying behaviour in a neotropical direct‐developing frog with subsequent short‐term maternal care. An amplectant pair of Pristimantis chocoensis was found at the Reserva Canandé in Esmeraldas, Ecuador, and we recorded oviposition and the later rotation and active burying of the clutch by the female. Both parents remained close to the nest area the following day. This rare observation sheds light on the complex but often cryptic reproductive behaviours of terrestrial amphibians and suggests that the evolution of direct development has selected for highly specialized forms of parental care