Barisia levicollis STEJNEGER, 1890

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Higher Taxa	Anguidae (Gerrhonotinae), Diploglossa, Anguimorpha, Sauria, Squamata (lizards)
Subspecies
Common Names	E: Chihuahuan Alligator Lizard S: Escorpión de Chihuahua
Synonym	Barisia levicollis STEJNEGER 1890: 184 Gerrhonotus imbricatus levicollis — DUNN 1936 Gerrhonotus levicollis levicollis — SMITH 1942: 368 Gerrhonotus levicollis levicollis — SMITH 1946: 464 Barisia levicollis — TIHEN 1949: 247 Barisia levicollis — SMITH & TAYLOR 1950: 202 Gerrhonotus imbricatus levicollis — WERMUTH 1969: 18 Barisia levicollis — GUILLETTE & SMITH 1982: 25 Barisia levicollis — LINER 1994 Barisia levicollis — ZALDIVAR-RIVERON et al. 2005 Barisia levicollis — LOPEZ-ESTRADA et al. 2026
Distribution	NW Mexico (Chihuahua, probably adjacent areas in Sonora), elevation 2400 - 3110 m Type locality: “Mexican boundary”. Probably Chihuahua (fide TIHEN 1949).
Reproduction	ovoviviparous
Types	Holotype: USNM 9362
Diagnosis	Unfortunately we had to temporarily remove additional information as this was scraped by multiple AI companies who sell that data. These details, e.g. detailed descriptions are available for collaborators and contributors. We will relaease that material sometime next year. Please contact us if you need any of this data earlier than that.
Comment	Synonymy: Barisia levicollis cillaris (SMITH 1942) has been placed within Barisia imbricata. Distribution: see Map in GUILLETTE & SMITH 1982: 24, Lopez-Estrada et al. 2026: Fig. 5.
Etymology	Named after Latin levis, smooth, smoothed, not rough + Latin colli, neck; throat. [“...nuchal scales not keeled, in ten longitudinal rows...”].
References	Bryson Jr, R.W. & Riddle, B.R. 2011. Tracing the origins of widespread highland species: a case of Neogene diversification across the Mexican sierras in an endemic lizard. Biological Journal of the Linnean Society, 105: 382–394 [2012, published online 2011] - get paper here Dunn, Emmett Reid 1936. The amphibians and reptiles of the Mexican Expedition of 1934. Proceedings of the Academy of Natural Sciences of Philadelphia 88: 471-477 - 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 Smith, Hobart 1942. Mexican herpetological miscellany. Proc. US Natl. Mus. 92 (3153): 349-395 - get paper here Smith, Hobart M. 1946. Handbook of Lizards: Lizards of the United States and of Canada. Comstock, Ithaca, NY, xxii + 557 pp. Stejneger, Leonhard 1890. On the North American lizards of the genus Barissa of Gray. Proc. US Natl. Mus. 13 (809): 183-185 - get paper here Tanner, W.W. 1987. Lizards and turtles of Western Chihuahua. Great Basin Naturalist. 47: 383-421 - get paper here Tihen, Joe A. 1949. A review of the lizard genus Barisia. Univ. Kansas Sci. Bull. 33 (3): 217-254 - get paper here Zaldívar-Riverón, A. & Nieto-Montes de Oca, A. 2002. Variation in the rare lizard Barisia rudicollis (Wiegmann) (Anguidae) with description of a new species from Central Mexico. Herpetologica 58 (3): 313-326 - get paper here Zaldivar-Riveron, A.; de Oca, A. Nieto-Montes; Laclette, J.P. 2005. Phylogeny and evolution of dorsal pattern in the Mexican endemic lizard genus Barisia (Anguidae: Gerrhonotinae). Journal of Zoological Systematics and Evolutionary Research 43(3):243-257 - get paper here López-Estrada, E.K., Zaldívar-Riverón, A., Jasso-Martínez, J.M., Samacá-Sáenz, E., Gutiérrez-Rodríguez, J., Benites, P., Salinas-Ramos, V.B., McCormack, J.E. & Bryson, R.W. 2026. UCE phylogenomics reveals orogenic vicariance and introgression shaping diversification in the montane Mexican lizard genus Barisia (Squamata: Anguidae). Molecular Phylogenetics and Evolution 217, 108531 - get paper here
External links	IUCN Red List National Center for Biotechnology Information Google images

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