La següent clau dicotòmica s’ha creat per tal d’identificar correctament qualsevol espècie de tortuga, llangardaix, sargantana, dragó, lludrió i serp que ens podem trobar a tota Catalunya. S’ha procurat que les descripcions permetin diferenciar els organismes, tant adults com juvenils, sense manipular-los. Leer más.
The ability to bear live offspring, viviparity, has evolved multiple times across the tree of life and is a remarkable adaptation with profound life-history and ecological implications. Within amphibians the ancestral reproductive mode is oviparity followed by a larval life stage, but viviparity has evolved independently in all three amphibian orders. Two types of viviparous reproduction can be distinguished in amphibians; larviparity and pueriparity. Leer más.
The early evolution of diapsid reptiles is marked by a deep contrast between our knowledge of the origin and early evolution of archosauromorphs (crocodiles, avian and non-avian dinosaurs) to that of lepidosauromorphs (squamates (lizards, snakes) and sphenodontians (tuataras)). Whereas the former include hundreds of fossil species across various lineages during the Triassic period1, the latter are represented by an extremely patchy early fossil record comprising only a handful of fragmentary fossils, most of which have uncertain phylogenetic affinities and are confined to Europe. Leer más.
Albanerpetontids are tiny, enigmatic fossil amphibians with a distinctive suite of characteristics, including scales and specialized jaw and neck joints. Here we describe a new genus and species of albanerpetontid, represented by fully articulated and three-dimensional specimens preserved in amber. These specimens preserve skeletal and soft tissues, including an elongated median hyoid element, the tip of which remains embedded in a distal tongue pad. Leer más.
El biólogo Roberto García-Roa examinó una serpiente albina que habían encontrado muerta en el margen de una carretera de un pueblo de Valencia. La muerte del ofidio no se debió a un atropello, sino a una causa biológica muy singular. Leer más.
