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Gerrhonotus mccoyi GARCÍA-VÁZQUEZ, CONTRERAS-ARQUIETA, TRUJANO-ORTEGA & NIETO-MONTES DE OCA, 2018

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Higher TaxaAnguidae (Gerrhonotinae), Diploglossa, Anguimorpha, Sauria, Squamata (lizards) 
Subspecies 
Common Names 
SynonymGerrhonotus mccoyi GARCÍA-VÁZQUEZ, CONTRERAS-ARQUIETA, TRUJANO-ORTEGA & NIETO-MONTES DE OCA 2018
Gerrhonotus infernalis — GOOD 1994 (in part.)
Gerrhonotus mccoyi — GARCÍA-VÁZQUEZ et al. 2019 
DistributionMexico (Coahuila)

Type locality: Poza Churince, municipality of Cuatro Ciénegas, Coahuila, Mexico (26°55’11.9’’N, 102°06’53.2’’W; datum 1⁄4 WGS84), 739 m elevation  
Reproduction 
TypesHolotype: MZFC 29654 (field number UOGV 1438), adult male, collected 9 September 2007 by U.O. García-Vázquez, M. Trujano-Ortega, and A. Contreras-Arquieta. Paratypes. 15 specimens; all from the municipality of Cuatro Cie ́negas, Coahuila, Mexico:13 (MZFC29655–66, 29669) from the same locality as the holotype and two (MZFC 29667–68) from Pozas Azules, Rancho Pronatura (26849032.90 0N, 102801020.90 0W; datum 1⁄4 WGS84), 714 m elevation. 
DiagnosisDiagnosis.—Gerrhonotus mccoyi sp. nov. can be distinguished from its congeners by a combination of characters which includes the presence of a cantholoreal scale (72%; n 1⁄4 16), a dark mark extending anteriorly from the lower temporal scales through the lower border of the orbit to the preocular or cantholoreal scales, keeled dorsal scales, usually (75%; n 1⁄4 16) 7–9 dorsal cross-bands mostly interrupted or barely discernible on middorsum (few cross-bands continuous, noticeable across middorsum in some specimens; midsection of cross-bands paler, narrower than the lateral sections), usually indiscernible vertical dark bars on the lateral fold (few, faint bars occasionally present), and black flecks scattered on the venter.

Comparisons with other species (Table 2).—Gerrhonotus mccoyi sp. nov. can be distinguished from the other species of the genus by having black flecks scattered on the venter (venter immaculate or with marks other than black flecks, or dark marks restricted to the sides of the venter in the other species [venter pale gray or pale brown, distinctly mottled with white in G. infernalis and G. rhombifer; dark marks restricted to the sides of the venter rarely present in G. liocephalus, G. ophiurus, and G. parvus; usually a row of small dark spots on each side of the venter in G. cf. liocephalus from Western Mexico—in this latter species, the dark spots tend to merge into dark longitudinal stripes in some specimens, and a gray midventral stripe is present in some specimens]). Gerrhonotus mccoyi sp. nov. differs from G. farri, G. lazcanoi, G. lugoi, G. parvus, and G. rhombifer by having keeled dorsal scales (dorsal scales smooth in the other species); from G. farri, G. infernalis, G. lazcanoi, G. lugoi, G. ophiurus, G. parvus, and G. rhombifer by having a dorsal body pattern usually composed of cross-bands mostly interrupted or barely discernible on middorsum (cross-bands continuous, conspicuous across middorsum present in the other species); and from G. liocephalus, G. ophiurus, and G. cf. liocephalus from Western Mexico by usually lacking discernible dark bars on the lateral fold (dark bars on the lateral fold prominent in the other species). Gerrhonotus mccoyi sp. nov. can be distinguished from all of the species of the genus, except G. liocephalus and G. ophiurus, by having a dark temporal-cantholoreal mark (dark temporal-cantholoreal mark absent in the other species [present only in young specimens, vestigial in adults, in G. infernalis and G. rombifer; head completely black in G. lazcanoi]); and from G. farri, G. infernalis, G. lazcanoi, and G. lugoi by usually having a cantholoreal scale (cantholoreal scale usually absent [92%, n 1⁄4 39] in G. infernalis, and absent in the other species). 
Comment 
EtymologyThe species epithet is a noun in the genitive case and a patronym for the late Clarence Jack McCoy in recognition of his many and significant contributions to the knowledge of the amphibians and reptiles from the Cuatro Ciénegas Basin. 
References
  • Álvarez, F.; M. Ojeda (eds.) 2019. Animal Diversity and Biogeography of the Cuatro Ciénegas Basin, Cuatro Ciénegas Basin: An Endangered Hyperdiverse Oasis Springer, 231 pp. - get paper here
  • García-Vázquez, Uri Omar; Arturo Contreras-Arquieta, Marysol Trujano-Ortega, and Adrián Nieto-Montes de Oca 2018. A New Species of Gerrhonotus (Squamata: Anguidae) from the Cuatro Ciénegas Basin, Coahuila, Mexico Herpetologica 74 (3): 269-278. - get paper here
  • García-Vázquez, Uri Omar; Marysol Trujano-Ortega, Arturo Contreras- Arquieta, Omar Ávalos-Hernández, Omar Osvaldo Escobedo-Correa, and Pablo Corcuera 2019. Chapter 13 Diversity of Amphibians and Reptiles in the Cuatro Ciénegas Basin. In: Álvarez, F.; M. Ojeda (eds.), Animal Diversity and Biogeography of the Cuatro Ciénegas Basin, Cuatro Ciénegas Basin Springer, pp. 175-188 - get paper here
 
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