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The spiny lizard genus    Sceloporus    was described by Wiegmann in 1828, with    S.   torquatus    posteriorly designated as the type species. The taxonomic history of    S.   torquatus    is complicated, as it has been confused with other taxa by numerous authors. Many modern systematics works have been published on    Sceloporus   , but none have included all five recognized    S.   torquatus    subspecies:    S.   t.   torquatus   ,    S.   t.   melanogaster   ,    S.   t.   binocularis   ,    S.   t.   mikeprestoni   , and    S.   t.   madrensis   . Additionally, there is previous evidence for at least one unnamed taxon. The present study is the first taxonomic revision of the enigmatic    S.   torquatus    based on molecular phylogenies using combined molecular data from 12S, ND4 and RAG1 genes, and Maximum Likelihood and Bayesian inference phylogenetic methods. This work includes the most extensive sampling across the entire distribution, as well as divergence time estimates and environmental niche modelling, which combined offer a spatio-temporal framework for understanding the evolution of the species. Additionally, a series of morphological characters are analyzed to identify significant differences between lineages consistently recovered in the molecular phylogenies. Using this integrative approach, evidence is presented for eight lineages within the    S.   torquatus    complex, five of which correspond to previously recognized subspecies and three represent unnamed taxa masked by morphological conservatism. Finally, to maintain taxonomic stability a lectotype and paralectoype are designated for    S.   torquatus   , and certain taxonomic changes are suggested in order to reflect the phylogenetic relationships within the    S.   torquatus    complex.

vertebrate zoology

Hidden diversity within a polytypic species: The enigmatic    Sceloporus   torquatus    Wiegmann, 1828 (  Reptilia  ,   Squamata  ,   Phrynosomatidae  )