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A serpe de esculapio (Zamenis longissimus) é unha cobra presente no noreste da península ibérica, con algunhas poboacións illadas hacia o oeste da península. Recentemente observouse e fotografiouse esta especie na provincia de Ourense. A observación informada nesta nota amplía a distribución da especie case 100 km cara o Oeste, representando a primeira cita da especie en Galicia. Leer más.

 

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Our study also shows that snake and mammal vision has evolved very differently in the transition from land to sea. Sea snakes have retained or expanded their colour vision compared to their terrestrial relatives, whereas pinnipeds and cetaceans underwent a further reduction in the dimensions of their colour vision. This contrast is further evidence of the remarkable evolutionary diversity of snake eyesight. Leer más.

Darevskia rock lizards is a unique complex taxa, including more than thirty species, seven of which are parthenogenetic. In mixed populations of Darevskia lizards, tri- and tetraploid forms can be found. The most important issues in the theory of reticulate evolution of Darevskia lizards are the origin of parthenogenetic species and their taxonomic position. However, there is little data on how meiosis proceeds in these species. The present work reports the complex results of cytogenetics in a diploid parthenogenetic species – D. unisexualis. Here we detail the meiotic prophase I progression and the specific features оf mitotic chromosomes organization. Leer más.

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