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Urosaurus gadovi SCHMIDT, 1921

IUCN Red List - Urosaurus gadovi - Least Concern, LC

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Higher TaxaPhrynosomatidae, Sceloporinae, Iguania, Sauria, Squamata (lizards)
Common NamesE: Gadow's Tree Lizard
S: Arboricola de Gadow 
SynonymPhymatolepis (Uta) irregularis FISCHER 1881: 232 (nomen dubium)
Uta irregularis — BOULENGER 1885: 216
Uta irregularis — GÜNTHER 1885: 62
Uta gadovi SCHMIDT 1921: 3
Uta irregularis — SMITH 1939
Urosaurus irregularis — MITTLEMAN 1942: 156
Urosaurus gadovi — MITTLEMAN 1942: 154
Uta gadovi SCHMIDT 1947
Urosaurus gadovi — SMITH & TAYLOR 1950: 145
Urosaurus irregularis — SMITH & TAYLOR 1950: 146
Urosaurus gadowi — DUELLMAN 1958
Urosaurus gadovi — LINER 1994
Urosaurus irregularis — LINER 1994
Urosaurus irregularis — LINER 2007
Urosaurus gadovi — LINER 2007 
DistributionMexico (Michoacan, Jalisco, Guerrero)

Type locality: Cofradía, Jalisco, Mexico.

irregularis: Mexico (no specific localiy known); Type locality: “Aus dem Hochlande von Mexico”  
TypesHolotype: AMNH 20355
Holotype: Museum Bremen, Germany, No. 437 (fide SMITH & TAYLOR 1950: 146); lost (L.L Grismer, cited in Wiens 1993) [irregularis] 
DiagnosisDiagnosis: Frontal entire, four to six rows of enlarged dorsal scales, abruptly larger than the granular scales with no granular scales on the vertebral line; dorsolateral line and lateral fold set with prominent tubercular scales, with a -row of tubercles between them; caudal scales strongly keeled, not spinose, in nearly uniform verticils (Schmidt 1921).

Diagnosis: Frontal usually entire, rarely split transversely into a large anterior portion and a much smaller posterior section; four to seven rows of enlarged dorsal scales along the median line, of which the median row is largest, and the remainder progressively diminish in size; no vertebrals separating the enlarged dorsals into parallel longitudinal series; enlarged dorsals extending posteriorly from the shoulders to the basal portion of the tail, or often ending in the sacral region; enlarged dorsals smaller than the enlarged femorals, and equal to or smaller than the tibials; external to the enlarged dorsals are several poorly defined, slightly enlarged clusters of tubercles, extending from axilla to groin; on the dorsolateral line of the neck and body a dermal fold crested with numerous small series of enlarged tubercles interspersed with larger, flat, mucronate scales; usually another, short fold, restricted to the supra-axillary region; along the lateral areas are three to five longitudinal series of clustered tubercles; lowest series of tubercles often in contact with the ventrals; ventrals abruptly differentiated from the lateral granules; gular scales flat, and largely pavemented; scales of the gular fold elongate, mucronate, imbricate, and laterally, faintly keeled; ventrals imbricate, mucronate to spinose, and faintly keeled especially laterally, males with rather small postanals; postfemoral dermal pocket absent. Coloration (alcoholic): Dorsal color ranging from slatey gray (in melanistic specimens) to a lighter brownish gray, or brown; head, tail, and median line of back slightly lighter; three to six blackish cross-bands, about evenly distributed from
cervical region to sacrum, these being about as wide as three to five of
the largest dorsals; in all except the darkest specimens, the dorsolateral, lateral, and ventrolateral surfaces are maculated with whitish areas, these usually being restricted to small clusters of enlarged, tubercular scales which dot these areas; entire labial and gular region, save for a rounded area immediately anterior to the gular fold, spotted and irregularly streaked with black, these being heavier in the males; venter of limbs, basal portion of tail, and interhumeral and interfemoral areas whitish and lightly maculated with dark flecks; abdomen, from axilla to groin, covered with an overlay of blue in both sexes, but anteriorly
more prominent and assuming an ovoid outline in males; tail faintly circled with narrow brown bands (Mittleman 1942: 154).

Diagnosis (irregularis): see Mittleman 1942: 156. 
CommentSynonymy: The status of U. irregularis remains unclear. Known from only one type specimen of unknown origin (in the ”highlands of Mexico”) which is now lost. Wiens (1993) speculates that it actually might be an aberrant U. bicarinatus or U. gadovi, a hybrid between these two, or a valid species. Not recognized as valid species by WIENS et al. 2013. We call it provisionally a “nomen dubium” until further clarification.

Distribution: see map in Feldman et al. 2011 (only 1 locality shown). 
EtymologyNamed after Hans Gadow, the collector of the holotype. 
  • Beolens, Bo; Michael Watkins, and Michael Grayson 2011. The Eponym Dictionary of Reptiles. Johns Hopkins University Press, Baltimore, USA - 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
  • Duellman, W.E. 1961. The amphibians and reptiles of Michoacan, Mexico. Univ. Kansas Publ. Mus. Nat. Hist. 15 (1) 148 pp. - get paper here
  • Duellman, William E. 1958. Comments on the type locality and geographical distribution of Urosaurus gadowi. Copeia 1958 (1): 48-49 - get paper here
  • 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
  • Fischer, J. G. 1881. Herpetologische Bemerkungen vorzugsweise über Stücke des Naturhistorischen Museums in Bremen. Abhandlungen des Naturwissenschaftlichen Vereins in Bremen, 7: 225-238 [Nov. 1881]
  • Günther, A. C. L. G. 1885. Reptilia and Batrachia. Biologia Centrali-Américana. Taylor, & Francis, London, 326 pp. [published in parts from 1885-1902; reprint by the SSAR 1987] - 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
  • Palacios-Aguilar, Ricardo & OSCAR FLORES-VILLELA 2018. An updated checklist of the herpetofauna from Guerrero, Mexico. Zootaxa 4422 (1): 1-24 - get paper here
  • Savage,J.M. 1958. The iguanid lizard genera Urosaurus and Uta, with remarks on related groups. Zoologica (New York) 43: 41-54 - get paper here
  • Schmidt, K.P. 1921. New species of North American lizards of the genera Holbrookia and Uta. American Museum Novitates 22: 1, 6 - get paper here
  • Schmidt, Karl P.;Shannon, Frederick A. 1947. Notes on amphibians and reptiles of Michoacan, Mexico. Zoological Series of Field Museum of Natural History 31 (9): 63-85
  • Smith, H.M. & Taylor,E.H. 1950. An annotated checklist and key to the reptiles of Mexico exclusive of the snakes. Bull. US Natl. Mus. 199: 1-253 - get paper here
  • Smith, Hobart M. 1939. Notes on Mexican reptiles and amphibians. Zoological Series of Field Museum of Natural History 24 (4): 15-35 - get paper here
  • Wiens, J.J. 1993. Phylogenetic systematics of the tree lizards (genus Urosaurus). Herpetologica 49 (4): 399-420 - get paper here
  • Wiens, John J.; Kenneth H. Kozak, and Natalia Silva 2013. DIVERSITY AND NICHE EVOLUTION ALONG ARIDITY GRADIENTS IN NORTH AMERICAN LIZARDS (PHRYNOSOMATIDAE). Evolution, 67: 1715–1728. doi: 10.1111/evo.12053 - get paper here
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