Abstract
Two new species of lizards of the saxicolous and viviparous genus Phymaturus from Patagonia are described. The new species are members of the Phymaturus patagonicus species group distributed only in volcanic plateaus and mountains of southern Argentina. Phymaturus sitesi sp. nov. differs from all other members of the patagonicus group in its unique dorsal pattern of small white spots on a light-gray to brown-gray background and allopatric geographical distribution. Absence of sexual dichromatism differentiated Phymaturus sitesi sp. nov. from P. payuniae, P. zapalensis, and P. delheyi n. sp. , and the midbody scales count differentiated from the P. delheyi sp. nov. and P. nevadoi (with some overlap). Also Phymaturus sitesi sp. nov. presents lower count in the ventral scales than in P. delheyi sp. nov. Phymaturus delheyi sp. nov. can be distinguished from other species of the patagonicus group by unique dorsal pattern of medium size white spots on a dark-brown background and allopatric distribution. The presence of sexual dichromatism differentiates Phymaturus delheyi sp. nov. from P. sitesi sp. nov. and P. nevadoi. Scales around midbody differentiated Phymaturus delheyi sp. nov. from P. payuniae and P. sitesi sp. nov. Also ventral scale count differentiated Phymaturus delheyi sp. nov. from P. sitesi sp. nov. and P. nevadoi (with some overlap).
References
Avila, L.J., Morando, M., Pérez, C.H.F. & Sites, J.W. Jr. (2004) Phylogenetic relationships of lizards of the Liolaemus petrophilus group (Squamata, Liolaemidae), with description of two new species from western Argentina. Herpetológica, 60, 187–203.
Avila, L.J., Morando, M., Pérez, C.H.F. & Sites, J.W. Jr. (2007) A new species of Liolaemus (Reptilia: Squamata: Liolaeminii) from southern Mendoza province, Argentina. Zootaxa, 1452, 43–54.
Avila, L.J., Morando, M., Pérez, D.R. & Sites, J.W. Jr. (2009) A new species of Liolaemus from Añelo sand dunes, northern Patagonia, Neuquén, Argentina, and molecular phylogenetic relationships of the Liolaemus wiegmannii species group (Squamata, Iguania, Liolaemini). Zootaxa, 2234, 39–55.
Avila, L.J., Morando, M., Pérez, D.R. & Sites, J.W. Jr. (2010) A new species of the Liolaemus elongatus clade (Reptilia: Iguania: Liolaemini) from Cordillera del Viento, northwestern Patagonia, Neuquén, Argentina Zootaxa, 2667, 28–42.
Avila, L.J., Pérez, C.H.F. & Morando, M. (2003) A new species of Liolaemus (Squamata: Iguania: Liolaemidae from northwestern Patagonia (Neuquén, Argentina). Herpetologica, 59, 534–545.
Barbour, T. (1921) On a small collection of reptiles from Argentina. Proceedings of the Biological Society of Washington, 34, 139–141.
Cei, J.M. (1986) Reptiles del centro, centro-oeste y sur de la Argentina. Herpetofauna de las zonas áridas y semiáridas. Monographs IV. Museo Regionale di Scienze Naturali Torino, 1–527.
Cei, J.M. (1993) Reptiles del Noroeste, Nordeste y Este de la Argentina. Herpetofauna de las Selvas subtropicales, Puna y Pampas. Monographs XIV. Museo Regionale di Scienze Naturali, Torino, 1–949.
Cei, J.M. & Castro, L.P. (1973) Taxonomic and serological researches on the Phymaturus patagonicus complex. Journal of Herpetology, 7, 237–247.
Cei, J.M. & Roig, V.G. (1975) A new lizard from the Sierra del Nevado Mountains, Central Argentina. Journal of Herpetology, 9, 256.
Chiszar, D., Gingery, T., Gingery, B. & Smith, H.M. (1999) Phymaturus patagonicus (Argentine chuckwalla). Facultative parthenogenesis. Herpetological Review, 30, 98.
Donoso-Barros, R. (1966) Reptiles de Chile. Universidad de Chile, Santiago, 458 pp.
Espinoza, R.E., Wiens, J.J. & Tracy, C.R. (2004) Recurrent evolution of herbivory in small, cold-climate lizards: Breaking the ecophysiological rules of reptilian herbivory. PNAS, 101, 16819–16824.
Etheridge, R. (1995) Redescription of Ctenoblepharys adspersa Tschudi, 1845, and the taxonomy of Liolaeminae (Reptilia: Squamata: Tropiduridae). American Museum of Natural History Novitates, 3142, 1–34.
Frost, D. (1992) Phylogenetic analysis and taxonomy of the Tropidurus group of lizards (Iguania, Tropiduridae). American Museum Novitates, 3033, 1–68.
Koslowsky, J. (1898) Enumeración sistemática y distribución geográfica de los reptiles argentinos. Revista del Museo de La Plata, 8, 161–200.
Lobo, F. & Quinteros, S. (2005a) A morphology-based phylogeny of Phymaturus (Iguania: Liolaemidae) with the description of four new species from Argentina. Papeis Avulsos de Zoología, 45, 143–177.
Lobo, F. & Quinteros, S. (2005b) Taxonomic studies of the genus Phymaturus (Iguania: Liolaemidae): Redescription of Phymaturus patagonicus Koslowsky 1898, and revalidation and redescription of Phymaturus spurcus Barbour 1921. Journal of Herpetology, 39, 535–540.
Lobo, F., Abdala, C.S. & Valdecantos, S. (2010) Taxonomic studies of the genus Phymaturus (Iguania: Liolaemidae): Description of four new species. South American Journal of Herpetology, 5, 102–126.
Morando, M. (2004) Sistemática y filogenia de grupos de especies de los géneros Phymaturus y Liolaemus (Squamata: Tropiduridae: Liolaeminae) del oeste y sur de Argentina. Ph.D. Dissertation, Universidad Nacional de Tucumán, San Miguel de Tucumán, Argentina.
Morando, M., Avila, L.J., Perez, C.H.F., Hawkins, M. & Sites, J.W. Jr. (2011) Molecular phylogeny of Phymaturus (Squamata, Liolaemini): too many lineages and few names. (in review).
Nuñez, H., Veloso, A., Espejo, P., Veloso, C., Cortes, A. & Araya, S. (2010) Nuevas especies de Phymaturus (grupo palluma) para la zona cordillerana central de Chile (Reptilia, Sauria, Liolaemidae). Boletín del Museo Nacional de Historia Natural Chile, 59, 41–74.
Padial, J.M., Miralles, A., De La Riva, I. & Vences, M. (2010) The integrative future of taxonomy. Frontiers in Zoology, 7, 16.
Scolaro, J.A. & Cei, J. M. (2003) Una excepcional nueva especie de Phymaturus de la precordillera de Chubut, Argentina (Liolaemidae, Iguania, Lacertilia, Reptilia). FACENA, 19, 157–162.
Scolaro, J.A. & Ibargüengoytia, N. (2007) A new species of Phymaturus from rocky outcrops in the central steppe of Rio Negro province, Patagonia Argentina (Reptilia: Iguania: Liolaemidae). Zootaxa, 1524, 47–55.
Scolaro, J.A., Ibargüengoytia, N.R. & Pincheira-Donoso, D. (2008) When starvation challenges the tradition of niche conservatism: On a new species of the saxicolous genus Phymaturus from Patagonia Argentina with pseudoarboreal foraging behaviour (Iguania, Liolaemidae). Zootaxa, 1786, 48–60.
Scolaro, J.A. & Ibargüengoytía, N.R. (2008) A new fragment for the understanding of the puzzling evolutive process of the Phymaturus genus: a new species of the patagonicus group from Patagonia, Argentina (Reptilia: Iguania: Liolaemidae). Zootaxa, 1939, 38–50.
Scolaro, J.A. & Pincheira-Donoso, D. (2010) Lizards at the end of the world: Two new species of Phymaturus of the patagonicus clade (Squamata, Liolaemidae) revealed in southern Patagonia of Argentina. Zootaxa, 2393, 17–32.
Scolaro, J.A. & Tappari, O.F. (2009) Una nueva especie del género Phymaturus del “grupo Patagonicus” en los afloramientos rocosos del sudoeste de la provincia de Río Negro, Patagonia Argentina (Reptilia: Iguania: Liolaemidae). Naturalia Patagónica, 5, 80–93.
Smith, H.M. (1946) Handbook of lizards, Comstock Publishing Company. Ithaca, New York, U.S.A, 557 pp.