Species Limits, Phylogenetic Relationships, and Origins of Viviparity in the Scalaris Complex of the Lizard Genus Sceloporus (Phrynosomatidae: Sauria)
نویسندگان
چکیده
We electrophoretically assayed 32 gene loci in the Sceloporus scalaris complex. We sampled 208 animals from 22 localities representing the following: Sceloporus aeneus (12 localities), S. bicanthalis (five localities), S. chaneyi (one locality), S. goldmani (one locality), and S. scalaris samcolemani (two localities), and we used Sceloporus parvus and S. variabilis as outgroups. Of the 32 gene loci, 11 were uninformative, 10 were polymorphic both within and among species, and 11 were polymorphic among species but monomorphic within species. Thirteen diagnostic loci, plus two morphological characteristics (number of canthal scales and male belly patterns) and the type of parity mode present, define a total of eight genetically and/or morphologically distinct ingroup units. Cladistic analysis of these markers suggests at least two separate origins of viviparity within the complex (based on the most parsimonious trees from the cladistic analysis), as well as the possibility of reproductively bimodal groups within the complex. A phylogenetic hypothesis of the complex is presented.
منابع مشابه
Mitochondrial Dna Sequence-based Phylogeny and the Evolution of Viviparity in the Sceloporus Scalaris Group (reptilia, Squamata).
The lizard genus Sceloporus contains both oviparous and viviparous species. The scalaris complex is the only monophyletic group within the genus that includes both reproductive modes, thus it is particularly well suited for studies of the evolution of viviparity. Approximately 874 nucleotides of mtDNA sequence data, collected from 38 specimens, comprising 25 populations of all five recognized s...
متن کاملA new species of bunchgrass lizard (Squamata: Phrynosomatidae) from the southern sky islands of the Sierra Madre Occidental, Mexico.
A new species of bunchgrass lizard in the Sceloporus scalaris group is described from the southern portion of the Sierra Madre Occidental in Mexico. The new species, Sceloporus aurantius sp. nov., was previously confused with S. brownorum but differs from this and all but one species within the S. scalaris group by a lack of blue belly patches in males. It shares with S. chaneyi an absence of b...
متن کاملOochoristica scelopori (Cestoda: Linstowiidae) in a grassland population of the bunch grass lizard, Sceloporus scalaris (Phrynosomatidae), from Arizona
متن کامل
Evolution of viviparity: a phylogenetic test of the cold-climate hypothesis in phrynosomatid lizards.
The evolution of viviparity is a key life-history transition in vertebrates, but the selective forces favoring its evolution are not fully understood. With >100 origins of viviparity, squamate reptiles (lizards and snakes) are ideal for addressing this issue. Some evidence from field and laboratory studies supports the "cold-climate" hypothesis, wherein viviparity provides an advantage in cold ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2008