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Gerrhonotus parvus KNIGHT & SCUDDAY, 1985

IUCN Red List - Gerrhonotus parvus - Endangered, EN

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Higher TaxaAnguidae (Gerrhonotinae), Diploglossa, Anguimorpha, Sauria, Squamata (lizards) 
Common NamesPygmy Alligator Lizard 
SynonymGerrhonotus parvus KNIGHT & SCUDDAY 1985
Elgaria parva — SMITH 1986
Elgaria parva — LINER 1994
Gerrhonotus parvus — CONROY et al. 2005 
DistributionMexico (Nuevo León); elevation 1,600-1,650 m.

Type locality: 3 km SE Galeana, Nuevo León, Mexico. Map legend:
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: SRSU 5538. Female (Fig. 1), collected 21 March 1983, by R. Alec Knight.
Paratype. SRSU 5537. Female (Fig. 2) collected 1 km S Galeana, Nuevo Leon, Mexico, 23 June 1977, by Kelvin Scott (Sul Ross State University). 
CommentSmallest anguid species “reaching a total length of only 55-[...]76 mm SVL” (BRYSON & LAZCANO 2005). BRYSON & LAZCANO 2005 state that molecular studies (CONROY et al. 2005) confirm its generic allocation to Gerrhonotus.

Known from only 7 specimens (BRYSON & GRAHAM 2010)

Habitat: among the leaves of dead yuccas

Similar species: G. parvus resembles G. lugoi, while other aspects are more like those of G. kingi. Gerrhonotus lugoi and G. parvus both are small species. McCoy (170) suggested that the holotype and paratype of G. lugoi are juveniles, perhaps on the basis of their small size.

Diagnosis: E. parva is distinguished from other species of the family Anguidae by the following characters: smooth dorsal scales, the rostral in contact with the nasals, a second primary temporal that is in contact with the fifth medial supraocular, suboculars separated from the lower primary temporal by an upper labial, and wide pale crossbands on the tail (after KNIGHT and SCUDDAY 185). 
EtymologyNamed after Latin “parvus, -a, -um” = small. 
  • Banda-Leal, Javier, David Lazcano, Manuel Nevárez-de los Reyes, Carlos Barriga-Vallejo 2014. Gerrhonotus parvus Knight & Scudday, 1985 (Squamata: Anguidae): New range extension and clutch size in the state of Nuevo León, Mexico. Check List 10 (4): 950-953 - get paper here
  • 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
  • Banda-Leal, Javier; Robert W. Bryson, Jr. and David Lazcano Villarreal 2002. New Record of Elgaria parva (Lacertilia: Anguidae) from Nuevo León, México Southwestern Naturalist 47(4): 614-615 - get paper here
  • Bryson, R.W. & Lazcano, D. 2005. Gerrhonotus parvus. Reptilia (GB) (39): 69-72 - 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
  • Conroy, C.J.; Bryson Jr., R.W.; Lazcano, D. & Knight, A. 2005. Phylogenetic placement of the Pygmy Alligator Lizard based on mitochondrial DNA. Journal of Herpetology 39 (1): 142-147 - get paper here
  • Knight R A; Scudday J F 1985. A new Gerrhonotus (Lacertilia: Anguidae) from the Sierra Madre Oriental, Nuevo Leon, Mexico. Southwestern Naturalist 30 (1): 89-94 - get paper here
  • Lazcano, D., J. Banda-Leal, and N. Alvarado-Moreno. 2017. Gerrhonotus parvus Knight and Scudday, 1985. Malformation. Mesoamerican Herpetology 4(3): 632–635 - get paper here
  • Smith, H. M. 1986. The generic allocation of two species of Mexican anguid lizards. Bull. Maryland Herp. Soc. 22: 21-22
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