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Sauromalus slevini VAN DENBURGH, 1922

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Higher TaxaIguanidae, Iguania, Sauria, Squamata (lizards)
Common NamesE: Slevin's Chuckwalla, Monserrat Chuckwalla
S: Iguana de Pared Monserrat 
SynonymSauromalus slevini VAN DENBURGH 1922
Sauromalus slevini — LINER 1994
Sauromalus slevini — HOLLINGSWORTH 1998: 154
Sauromalus slevini — KÖHLER & ZORN 2014 
DistributionMexico (Gulf of California: Monserrate, Carmen, Soronados islands)

Type locality: South end of Monserrate Island, Gulf of California  
TypesHolotype: CAS 50503 
DiagnosisOriginal Description (from DENBURGH 1922): Head and body large, much depressed, the latter very broad. Head almost triangular, with narrow rounded snout, and covered with small plates largest on frontal and temporal regions. Nostrils opening upward, outward, and slightly backward, in round plates a little nearer to end of snout than to orbits. Superciliaries like supraoculars, small and juxtaposed. Suboculars all short, but slightly keeled. Rostral plate very small. Labial plates small and of about equal size. Symphyseal plate long but very narrow. Several series of slightly enlarged sublabials, passing gradually into the finely granular gulars. Gular fold covered with very small scales. Ear-opening large, almost vertical, with strong 'anterior
denticulation of spinose scales. A strong fold on each side of neck, bearing numerous spinose tubercles. Scales on back and sides small, largest medially and on strong lateral fold, smooth or slightly spinose medially, laterally sometimes keeled and usually ending in an obtuse spine. Dorsals 20 to 25 to a head length. Ventral scales smooth, smaller than dorsals, about 108 to 125 rows between gular
fold and anus. Tail little longer than head and body, conical, very stout, and covered with whorls of fairly large, strongly keeled, spinose scales 5 about 35 to 48 scales in a whorl at largest part of tail. Scales on fore and hind limbs rather obtusely spinose, sometimes keeled on distal part of scale. Femoral pores very large in males, small in females, varying in number from 12 to 17 j average in 66
thighs, 14.62.

The ground color above is brownish, yellowish or greenish olive, sometimes with 'a yellowish middorsal band, spotted, marbled, or cross-banded with reddish or blackish brown. The head, tail and limbs are unicolor, or the tail may be faintly cross-banded with darker brown. The ventral surfaces are dull brownish or greenish yellow, more or less clouded, marbled or spotted with dark brown, especially on the throat (table with meaurements omitted here). 
CommentRemarks. This species is intermediate in size, color, and scale characters between S. hispidus and S. ater. Specimens from the three islands where it occurs seem to be indistinguishable. 
EtymologyNamed after Joseph Richard Slevin (1881-1957), curator of Herpetology at the California Academy of Sciences 1928-1957. 
  • Alberts, A.C.; Carter, R.L.; Hayes, W.K. & Martins, E.P. (eds.) 2004. Iguanas - Biology and Conservation. University of California Press, 356 pp. - get paper here
  • Beaman,K.R.; Hollingsworth,B.D.; Lawler, H.E. & Lowe,C.H. 1997. Bibliography of Sauromalus (Duméril 1856), the Chuckwallas. Smithsonian Herp. Inf. Serv. (116): 1-44 - get paper here
  • Beolens, Bo; Michael Watkins, and Michael Grayson 2011. The Eponym Dictionary of Reptiles. Johns Hopkins University Press, Baltimore, USA - get paper here
  • Blair, David W. 1994. Chuckwallas. Reptiles 1 (3): 16-22
  • Buckley, Larry J.; Kevin de Queiroz, Tandora D. Grant, Bradford D. Hollingsworth, John B. Iverson (Chair, <br />Stesha A. Pasachnik, and Catherine L. Stephen (Iguana Taxonomy Working Group, ITWG 2016. A Checklist of the Iguanas of the World (Iguanidae; Iguaninae). Herp. Cons. Biol. 11 (Monograph 6) - get paper here
  • de Queiroz K 1995. Checklist and key to the extant species of Mexican iguanas (Reptilia: Iguaninae). Publ. Esp. Mus. Zool. Univ. Nac. Autón. México 9: 1-48
  • Hollingsworth, B. D. 1998. The systematics of Chuckwallas (Sauromalus) with a phylogenetic analysis of other iguanid lizards. Herpetological Monographs 12: 38-191. - 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
  • Köhler, G. & Zorn, H. 2014. Chuckwallas. Herpeton-Verlag, 120 pp. [review in Reptilia 23 (132): 62] - get paper here
  • Van Denburgh, John 1922. The Reptiles of Western North America. Volume I. Lizards. Occ. Pap. Cal. Acad. Sci. (10): 1–612 - get paper here
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