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Urosaurus nigricaudus (COPE, 1864)

IUCN Red List - Urosaurus nigricaudus - Least Concern, LC

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Higher TaxaPhrynosomatidae, Sceloporinae; Iguania, Sauria, Squamata (lizards) 
Subspecies 
Common NamesSmall-scaled Lizard [microscutatus] 
SynonymUta nigricaudus COPE 1864: 176
Uta nigricauda — BOULENGER 1885: 212
Uta microscutata VAN DENBURGH 1894
Uta parviscutata COPE 1900: 324 (nom. subst. pro Uta microscutata)
Urosaurus nigricaudus — MITTLEMAN 1942: 157
Urosaurus microscutatus — MITTLEMAN 1942: 159
Urosaurus nigricaudus — SMITH & TAYLOR 1950: 145
Urosaurus microscutatus — SMITH & TAYLOR 1950: 145
Urosaurus microscutatus — RAU 1977
Urosaurus microscutatus — STEBBINS 1985: 137
Urosaurus nigricaudus — STEBBINS 1985: 238
Urosaurus nigricaudus — LINER 1994
Urosaurus microscutatus — LINER 1994
Urosaurus nigricaudus — GRISMER 1999
Urosaurus nigricaudus — COLLINS & TAGGART 2009 
Distributionnigricaudus: Mexico (Baja California Sur, adjacent islands: Espiritu Santo, Ballena, San José, Islas Las Islitas, Las Tijeras, Isla Pardo, Islas Los Candeleros [HR 28(1)], Magdalena ?)

microscutatus: USA (S California), Mexico (Baja California, Islands of San Francisco, San José, Danzante, Coronado, Carmen, San Marcos, Santa Magdalena). Type locality: San Pedro Mártir Mountains, Baja California.

Type locality: Cape San Lucas, Baja California.  
Reproductionoviparous 
TypesSyntypes: USNM 5307 (nigricaudus)
Holotype: Stanford Univ. Mus. 1221 [microscutatus] = CAS-SUR 1221 
CommentUrosaurus nigricaudus and U. microscutatus differ consistently in male throat coloration (usually blue in microscutatus, orange to gray in nigricaudus) and other characters. However, L.L. Grismer (cited in Wiens 1993) has observed specimens that are morphologically intermediate between these two “species”. Aguirre et al. (1999) suggest to synonymize U. microscutatus with Urosaurus nigricaudus lahtelai based on genetic evidence. GRISMER (1999) also synonymized the two species based on morphological intermediates. Feldman et al. (2011) confirm the uncertain status of U. microscutatus but express concern “that U. microscutatus is being dismissed prematurely”, hence they treat it as different in their tree and range map.

Distribution: see map in Feldman et al. 2011. 
References
  • Aguirre L., Gustavo, David J. Morafka and Robert W. Murphy. 1999. The peninsular archipelago of Baja California: a thousand kilometers of tree lizard genetics. Herpetologica 55 (3): 369-381 - get paper here
  • Boulenger, G.A. 1885. Catalogue of the lizards in the British Museum (Natural History). Vol. 2, Second edition. London, xiii+497 pp. - get paper here
  • Cope, E.D. 1864. Contributions to the herpetology of tropical America. Proc. Acad. Nat. Sci. Philadelphia 16: 166-181. - get paper here
  • Cope, E.D. 1900. The crocodilians, lizards and snakes of North America. Ann. Rep. U.S. Natl. Mus. 1898: 153-1270 - get paper here
  • Crother, B. I. (ed.) 2012. Standard Common and Current Scientific Names for North American Amphibians, Turtles, Reptiles, and Crocodilians, Seventh Edition. Herpetological Circular 39: 1-92
  • Feldman, Chris R.; Oscar Flores-Villela, Theodore J. Papenfuss 2011. Phylogeny, biogeography, and display evolution in the tree and brush lizard genus Urosaurus (Squamata: Phrynosomatidae). Molecular Phylogenetics and Evolution 61 (3): 714-725 - get paper here
  • Galina-Tessaro, Patricia, Alfredo Ortega-Rubio and Sergio Alvarez-Cárdenas. 2000. Diet of the Black-tailed Brush Lizard Urosaurus nigricaudus of the Cape Region, baja California Sur, México. Herpetological Natural History 7(1):35-40
  • Grismer, L. Lee. 1999. An evolutionary classification of reptiles on islands in the Gulf of California, México. Herpetologica 55 (4): 446-469 - get paper here
  • Jones, L.L. & Lovich, R.E. 2009. Lizards of the American Southwest. A photographic field guide. Rio Nuevo Publishers, Tucson, AZ, 568 pp. [review in Reptilia 86: 84] - get paper here
  • Leviton, Alan E.; Banta, Benjamin H. 1964. Midwinter reconnaissance of the herpetofauna of the Cape Region of Baja California, Mexico. Proc. Cal. Acad. Sci. 30 (7): 127-156 - get paper here
  • Lindell, Johan; Fausto R. Méndez-de la Cruz and Robert W. Murphy 2008. Deep biogeographical history and cytonuclear discordance in the black-tailed brush lizard (Urosaurus nigricaudus) of Baja California. Biological Journal of the Linnean Society 94: 89–104 - get paper here
  • Liner, Ernest A. 2007. A CHECKLIST OF THE AMPHIBIANS AND REPTILES OF MEXICO. Louisiana State University Occasional Papers of the Museum of Natural Science 80: 1-60 - get paper here
  • Mittleman,M.B. 1942. A summary of the iguanid genus Urosaurus. Bull. Mus. Comp. Zool. Harvard 91: 105-181 - get paper here
  • Munguia-Vega, A., R. Rodriguez-Estrella, M.W. Nachman, W. Shaw, and M. Culver. 2009. Habitat loss and fragmentation in the Sonoran Desert and its impact on the genetic structure and extinction risk of the Baja California endemic Black-tailed Brush Lizard (Urosaurus nigricaudus). Sonoran Herpetologist 22 (6):62-65. - get paper here
  • Rau,C.S. & Loomis,R.B. 1977. A new species of Urosaurus (Reptilia, Lacertilia, Iguanidae) from Baja California, Mexico. Journal of Herpetology 11 (1): 25-29 - get paper here
  • Stebbins,R.C. 1985. A Field Guide to Western Reptiles and Amphibians, 2nd ed. Houghton Mifflin, Boston
  • Van Denburgh,J. 1894. Descriptions of three new lizards from California and ower California, with a note on Phrynonsoma blainvillii. Proc. Cal. Acad. Sci. (Ser. 2), 4: 296-301 - get paper here
  • Van Denburgh,J. 1895. A review of the herpetology of Lower California. Part I - Reptiles. Proc. Cal. Acad. Sci. (2) 5: 77-163 - get paper here
  • Wiens, J.J. 1993. Phylogenetic systematics of the tree lizards (genus Urosaurus). Herpetologica 49 (4): 399-420 - get paper here
  • Wong, Humberto; Grismer, L. Lee; Hollingsworth, Bradford D.; Cryder, Michael R. 1997. Geographic Distribution. Urosaurus nigricaudus. Herpetological Review 28 (1): 51 - get paper here
  • Zweifel, Richard G. 1958. Results of the Puritan-American Museum of Natural History Expedition to western Mexico 2. Notes on reptiles and amphibians from the Pacific Coastal Islands of Baja California. American Museum Novitates (1895): 1-17 - get paper here
 
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