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12 January 2017 Multiple Sex Chromosome System and Robertsonian Rearrangements Involved in the Chromosome Evolution of the Phymaturus palluma group (Iguania: Liolaemidae)
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Abstract

The Liolaemid genus Phymaturus is a clade of saxicolous lizards with 44 species recognized, grouped in the Phymaturus palluma and the Phymaturus patagonicus groups. The chromosome data about this genus are extremely scarce; however, unpublished evidence suggests a great karyotypic diversity, mainly in the P. palluma group. In this work, we describe the karyotypes of six species of the P. palluma group (one of them unnamed) and report a multiple chromosome sex determination system with heterogametic males (X1X1X2X2 / X1X2Y). This sex-system represents a putative synapomorphy for the group. In accordance with the published literature and data obtained in this study, we report a wide variability for the diploid number of the P. palluma group (2N = 26 to 36) but same autosomic fundamental number in all the species of the clade (FNa = 32). Such variation is a consequence of different numbers of telocentric macroautosome pairs among karyotypes (2 to 10), suggesting chromosomal evolution of the group, driven mainly by successive Robertsonian rearrangements.

Copyright 2016 Society for the Study of Amphibians and Reptiles
Jimena R. Grosso, Dario Cardozo, Diego Baldo, and Fernando Lobo "Multiple Sex Chromosome System and Robertsonian Rearrangements Involved in the Chromosome Evolution of the Phymaturus palluma group (Iguania: Liolaemidae)," Journal of Herpetology 51(1), (12 January 2017). https://doi.org/10.1670/15-114
Accepted: 1 July 2016; Published: 12 January 2017
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