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Gerrhonotus farri BRYSON & GRAHAM, 2010

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Higher TaxaAnguidae (Gerrhonotinae), Diploglossa, Anguimorpha, Sauria, Squamata (lizards) 
Common Names 
SynonymGerrhonotus farri BRYSON & GRAHAM 2010 
DistributionMexico (Tamaulipas)

Type locality: north of Magdaleno Cedillo, 27 km southwest of Tula, Municipio Tula, Tamaulipas, Mexico (22° 49’ 33.6’’ N, 99° 54’ 28.2’’ W, WGS84; 1067 m elevation). Map legend:
Type locality - Type locality.
TDWG region - Region according to the TDWG standard, not a precise distribution map.

NOTE: TDWG regions are generated automatically from the text in the distribution field and not in every cases it works well. We are working on it.
TypesHolotype: UANL 6600, an adult male collected by William L. Farr, Toby J. Hibbitts (field number TJH 881), and James R. Dixon on 26 September 2006. 
CommentDiagnosis.—Gerrhonotus farri can be distinguished from all other gerrhonotine lizards except G. lugoi and G. parvus in having smooth dorsal scales. Gerrhonotus farri, G. lugoi, and G. parvus lack a postrostral, further differentiating these species from other Gerrhonotus. Gerrhonotus farri and G. lugoi differ from G. parvus by possessing anterior internasals and a head very distinct from the neck, and by lacking rostral–nasal contact, contact between the supranasals, and cantholoreals. From G. lugoi, G. farri differs in number of longitudinal dorsal scale rows (14 vs. 18–19), longitudinal ventral scale rows (12 vs. 14), suboculars (2 vs. 3), and primary temporals (4 vs. 5). Furthermore, G. farri is longer (109 mm vs. 94 mm snout–vent length [SVL]) and more robust than G. lugoi, and possesses a unique color pattern of white stippling on the head and suffusion of dark-edged white dots dorsolaterally, seen only in one other specimen of G. parvus (UANL 6220). These differences are summarized in Table 1. Of questionable importance is the presence of two seemingly azygous, longitudinally oriented scales separating the prefrontals in G. farri (Fig. 2). These scales were not present in any of the other specimens we examined, and not reported by Good (1988) after his examination of nearly 1000 gerrhontine lizards. To our knowledge, no other gerrhonotine lizards have these scales. 
EtymologyEtymology.—The specific epithet, an unlatinized noun in the genitive singular case, is a patronym honoring William L. Farr who helped collecting the type specimen of this species. 
  • Banda-Leal, Javier; Manuel Nevárez-de los Reyes, and Robert W. Bryson, Jr. 2017. A New Species of Pygmy Alligator Lizard (Squamata: Anguidae) from Nuevo León, México. Journal of Herpetology 51(2):223-226. - get paper here
  • Bryson, Robert W. and Matthew R. Graham. 2010. A new alligator lizard from northeastern Mexico. Herpetologica 66 (1): 92-98 - get paper here
  • Terán-Juárez, Sergio A., Elí García Padilla, Vicente Mata-Silva, Jerry D. Johnson and Larry David Wilson. 2016. The herpetofauna of Tamaulipas, Mexico: composition, distribution, and conservation status. Mesoamerican Herpetology 3 (1): 43–113 - get paper here
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