Montane Rattlesnakes in México: Venoms of and Related Species within the Group.

The group is a clade of rattlesnakes consisting of several species adapted to a high elevation habitat, primarily in México. was previously classified as , until individuals occurring on Cerro Tancítaro in Michoacán, México, were reevaluated and classified as a new species () based on scale pattern and geographic location. This study aimed to characterize the venom of and compare the venom profile to those of other species within the group using gel electrophoresis, biochemical assays, reverse-phase high performance liquid chromatography, mass spectrometry, and lethal toxicity (LD) assays.

Tracing an invasion: landbridges, refugia, and the phylogeography of the Neotropical rattlesnake (Serpentes: Viperidae: Crotalus durissus).

Abstract Pleistocene fragmentation of the Amazonian rainforest has been hypothesized to be a major cause of Neotropical speciation and diversity. However, the role and even the reality of Pleistocene forest refugia have attracted much scepticism. In Amazonia, previous phylogeographical studies have focused mostly on organisms found in the forests themselves, and generally found speciation events to have predated the Pleistocene.