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Crotaphytus nebrius AXTELL & MONTANUCCI, 1977

IUCN Red List - Crotaphytus nebrius - Least Concern, LC

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Higher TaxaCrotaphytidae, Iguania, Sauria, Squamata (lizards)
Common NamesE: Sonoran Collared Lizard 
SynonymCrotaphytus collaris nebrius AXTELL & MONTANUCCI 1977
Crotaphytus nebrius — MCGUIRE 1996
Crotaphytus nebrius — CROTHER 2000
Crotaphytus nebrius — FLORES-VILLELA & CANSECO-MÁRQUEZ 2004
Crotaphytus nebrius — COLLINS & TAGGART 2009
Crotaphytus nebrius — HEIMES 2022 
DistributionUSA (Arizona), Mexico (Sonora)

Type locality: "28°30'30"N—111°02'30"W (14 Km by road N.
Rancho Cieneguita), Sonora, Mexico".  
TypesHolotype: LACM 126617 (Los Angeles Co. Mus.) 
DiagnosisDiagnosis: Crotaphyus nebrius can be distinguished from C. dickersonae, C. grismeri. C. bicinctures, C.vestigium, and C. insularis by the absence in adult males of a laterally compressed tail, enlarged dark brown or black inguinal patches that extend between one-third and one-half the distance between the hindlimb and forelimb insertions, and a pale white dorsal caudal stripe. It can be funher distinguished from C. grismeri, C. bicinctores, C. vestigium, and C. insularis by the presence of black oral melanin. It can be distinguished from C. reticufatusand C. antiquits by its dorsal color pattern of white spots on a pale tan field, rather than white reticulations on a pale tan or brown field and the absence of jet black femoral pores in males. It can be further distinguished from C. reticulatus by the presence in adult males of small dark brown or black inguinal patches. It can be distinguished from C. collaris by the presence in adult males ofdark brown or black pigmentation in the gular fold (= ventrally complete anterior collar) and by the presence of burnt orange ventrolateral abdominal coloration in breeding males (McGuire 1996: 88). 
EtymologyThe name nebrius comes from the Greek word nebrias meaning spotted like a fawn. This is in allusion to the distinctive large white dorsal spotting in this form. 
  • Axtell, R.W. and Montanucci, R.R. 1977. Crotaphytus collaris from the eastern Sonoran Desert: description of a previously unrecognized geographic race. Nat. Hist. Misc. Chicago Acad. Sci. No. 201: 1-8
  • Collins, J.T. and T. W. Taggart 2009. Standard Common and Current Scientific Names for North American Amphibians, Turtles, Reptiles, and Crocodilians, Sixth Edition. Center for North American Herpetology, 48 pp.
  • 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
  • DAWSON, JEFFREY. 2022. First report of caudal bifurcation in the Sonoran Collared Lizard, Crotaphytus nebrius (Squamata: Crotaphytidae). Herpetology Notes 15: 263–265. - get paper here
  • Enderson, Erik F.; Thomas R. Van Devender, Robert L. Bezy 2014. Amphibians and reptiles of Yécora, Sonora and the Madrean Tropical Zone of the Sierra Madre Occidental in northwestern Mexico. Check List 10 (4): 913-926 - get paper here
  • Heimes, P. 2022. LIZARDS OF MEXICO - Part 1 Iguanian lizards. Edition Chimaira, Frankfurt Am Main, 448 pp.
  • Hollingsworth, Bradford D.; Gergus, Erik W. A. 1997. Geographic Distribution. Crotaphytus nebrius. Herpetological Review 28 (1): 50 - 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
  • Lemos-Espinal JA, Smith GR, Rorabaugh JC 2019. A conservation checklist of the amphibians and reptiles of Sonora, Mexico, with updated species lists. ZooKeys 829: 131-160 - get paper here
  • Lipfert, J. 2004. Halsbandleguane (die Gattung Crotaphytus). Natur und Tier Verlag (Münster), 64 pp. - get paper here
  • McGuire, J. A. 1996. Phylogenetic systematics of crotaphytid lizards (Reptilia: Iguania: Crotaphytidae). Bulletin of Carnegie Museum of Natural History 32: 1-142 - get paper here
  • Nevárez-de los Reyes; Manuel, David Lazcano, Javier Banda-Leal and Ian Recchio 2014. Notes on Mexican Herpetofauna 22: Herpetofauna of the Continental Portion of the Municipality of Hermosillo, Sonora, Mexico. Bull. Chicago Herp. Soc. 49(8):105-115 - get paper here
  • Werning, Heiko 2012. Die Reptilien und Amphibien des Südwestens. Draco 13 (50): 18-60 - get paper here
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