Phylogenomics and species delimitation in the knob-scaled lizards of the genus Xenosaurus (Squamata: Xenosauridae) using ddRADseq data reveal a substantial underestimation of diversity
Por:
Nieto-Montes de Oca, Adrian, Barley, Anthony J., Meza-Lazaro, Rubi N., Garcia-Vazquez, Uri O., Zamora-Abrego, Joan G., Thomson, Robert C., Leache, Adam D.
Publicada:
1 ene 2017
Resumen:
Middle American knob-scaled lizards of the genus Xenosaurus are a unique
radiation of viviparous species that are generally characterized by a
flattened body shape and a crevice-dwelling ecology. Only eight species
of Xenosaurus, one of them with five subspecies (X. grandis), have been
formally described. However, species limits within Xenosaurus have never
been examined using molecular data, and no complete phylogeny of the
genus has been published. Here, we used ddRADseq data from all of the
described and potentially undescribed taxa of Xenosaurus to investigate
species limits, and to obtain a phylogenetic hypothesis for the genus.
We analyzed the data using a variety of phylogenetic models, and were
able to reconstruct a well-resolved and generally well-supported
phylogeny for this group. We found Xenosaurus to be composed of four
major, allopatric clades concordant with geography. The first and second
clades that branch off the tree are distributed on the Atlantic slopes
of the Sierra Madre Oriental and are composed of X. mendozai, X.
platyceps, and X. newmanorum, and X. tzacualtipantecus and an
undescribed species from Puebla, respectively. The third Glade is
distributed from the Atlantic slopes of the Mexican Transvolcanic Belt
in west-central Veracruz south to the Pacific slopes of the Sierra Madre
del Sur in Guerrero and Oaxaca, and is composed of X. g. grandis, X.
rectocollaris, X. phalaroanthereon, X. g. agrenon, X. penai, and four
undescribed species from Oaxaca. The last Glade is composed of the four
taxa that are geographically closest to the Isthmus of Tehuantepec (X.
g. arboreus, X. g. rackhami, X. g. sanmartinensis, and an undescribed
species from Oaxaca). We also utilized a variety of molecular species
delimitation approaches, including analyses with GMYC, PTP, BPP, and
BFD*, which suggested that species diversity in Xenosaurus is at least
30% higher than currently estimated. (C) 2016 Elsevier Inc. All rights
reserved.
Filiaciones:
Nieto-Montes de Oca, Adrian:
Univ Nacl Autonoma Mexico, Fac Ciencias, Lab Herpetol, Ciudad Univ, Mexico City 04510, DF, Mexico
Barley, Anthony J.:
Univ Hawaii Manoa, Dept Biol, Honolulu, HI 96822 USA
Meza-Lazaro, Rubi N.:
Univ Nacl Autonoma Mexico, Fac Ciencias, Lab Herpetol, Ciudad Univ, Mexico City 04510, DF, Mexico
Garcia-Vazquez, Uri O.:
Univ Nacl Autonoma Mexico, Fac Estudios Super Zaragoza, Batalla 5 Mayo S-N, Mexico City 09230, DF, Mexico
Zamora-Abrego, Joan G.:
Univ Nacl Colombia, Fac Ciencias Agr, Dept Ciencias Foresales, Medellin 050034, Antioquia, Colombia
Thomson, Robert C.:
Univ Hawaii Manoa, Dept Biol, Honolulu, HI 96822 USA
Leache, Adam D.:
Univ Washington, Dept Biol, Seattle, WA 98195 USA
Univ Washington, Burke Museum Nat Hist & Culture, Seattle, WA 98195 USA
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