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Gerrhonotus lazcanoi BANDA-LEAL, NEVÁREZ-DE LOS REYES, BRYSON, 2017

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Higher TaxaAnguidae (Gerrhonotinae), Diploglossa, Anguimorpha, Sauria, Squamata (lizards) 
Common Names 
SynonymGerrhonotus lazcanoi BANDA-LEAL, NEVÁREZ-DE LOS REYES, BRYSON 2017 
DistributionMéxico (Nuevo León)

Type locality: 4.4 km east of Rinconada, Municipality of García, Nuevo León, México (25.674618, -100.672888, WGS84; 1,144 m elevation).  
TypesHolotype: UANL 7273, Juvenile male (Fig. 1), collected by Manuel Nevárez de los Reyes on 3 July 2010. 
CommentDiagnosis. Gerrhonotus lazcanoi is a relatively small anguid with smooth dorsal scales, three postmentals, an azygous scale between the postmentals and the gular shields, and a postrostral scale. It is most similar in appearance to G. farri, G. lugoi, and G. parvus. These four species are distinguished from other Gerrhonotus, and all other gerrhonotines (except Coloptychon rhombifer), by the lack of keeling on the scales in both juveniles and adults, giving the dorsal surface of the body a glossy appearance. The only known specimen of G. lazcanoi also has three postmental scales and a single large azygous scale between the postmentals and gular shields (Fig. 2), neither of which have been reported previously in any other gerrhonotines (Good, 1988). Gerrhonotus lazcanoi can be further distinguished from other smooth-scaled species by several differences in the scalation of the face and body. Gerrhonotus lazcanoi has a postrostral scale present (absent in G. farri, G. lugoi, and G. parvus), four postoculars (two–three in G. farri and G. lugoi, three in G. parvus), nine sublabial scales (G. farri and G. lugoi have six, G. parvus has seven), 20 rows of longitudinal dorsal scales (G. lugoi has 18–19, G. parvus 16, and G. farri 14), and 15 longitudinal ventral scale rows (G. lugoi has 14, G. parvus and G. farri have 12). Gerrhonotus lazcanoi shares with G. ugoi two preoculars, five primary temporal scales, and 65 transverse ventral rows.
Description of Holotype (measurements in mm).—Snout-to-vent length, 39.9; width of body, 7.2; width of base of tail, 2.8; width of head, 6.6; length of head (from anterior margin of ear to tip of snout), 9.4; length of rostral (from anterior region of eye to tip of snout), 3.3; depth of head (at widest point), 7.6; orbital diameter, 2.7; axil to base of thigh, right, 21.8 and left, 20.1; length of arm, right, 3.4 and left, 3.4; length of tibia, right, 5.0 and left, 5.1; longest finger of anterior limb, 2.2; longest finger of posterior leg, 3.1; tail length (complete), 48.2.
Relatively large head (Fig. 3), wider than the neck, especially between the anterior auricular region and postocular region. Head scales smooth and glossy. Postrostral present; anterior internasals 1/1; supranasals 1/1; posterior internasals 1/1; primary temporals 5/5, first and second in contact with fifth supraocular; secondary temporals 5/5; preoculars 2/2, upper- most in contact with superciliaries; postoculars 4/4; suboculars 3/3; anterior as long as where two posteriors meet; super- ciliaries 6/6; loreals 2/2; canthals 2/2; postnasals 2/2; large frontonasal, twice wider than long and separated from frontal by two prefrontals in contact; supralabials 15/14; infralabials 12/12; 3 postmentals, with single, azygous scale between the postmentals and chinshields; sublabials 9/9, in contact with postmental; chinshields 5/5.
Body slender and elongated with small limbs; posterior limbs slightly more robust than anterior. Lateral fold consists of numerous granular scales that do not form diagonal rows. Transverse dorsal scales in 56 rows, longitudinal 20; transverse ventral scales in 65 rows, longitudinal 15. Forelimbs covered by large scales dorsally, becoming up to four times smaller ventrally. Subdigital lamellae of fingers as follows: 18: 5–6; 28: 9–9; 38: 12–12; 48: 12–12; and 58: 7–7. Hindlimbs covered by
relatively large scales dorsally; smaller scales on posterior surface of femur. Subdigital lamellae of toes as follows: 18: 5–6; 28: 9–9; 38: 12–12; 48: 12–128; and 58: 7–7. Tail complete with 90 caudal whorls.

Habitat: The single specimen of G. lazcanoi was found at 1100 hours on a rocky slope with microphyllous and rosetophilous desert scrubs at the base of an Echinocereus stramenius cactus. The relative humidity was 85% and the ambient air temperature was 20°C. 
EtymologyThe epithet is a patronym honoring our friend, teacher, and mentor Dr. David Lazcano, Head of the Laboratorio de Herpetología, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo Leon, who has contributed substantially to the investigation of the herpetofauna in northeastern Mexico. 
  • 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
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