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Citation: Midtgaard, Rune. RepFocus - A Survey of the Reptiles of the World. (www.repfocus.dk).
Latest update: December 31st, 2022.

Taxonomy of the family Anguidae
Bibliography of the genus Gerrhonotus
Biodiversity of the family Anguidae


Eastern Alligator Lizards

Östliche Alligatorschleichen, Krokodilschleichen

Østlige Alligatorøgler

1828 Gerrhonotus Wiegmann (type species: Gerrhonotus tesselatus Wiegmann 1834)
1829 Pterogastenes Peale & Green (type species: Scincus ventralis Peale & Green 1829; syn. Good 1988)
1949 Coloptychon Tihen (type species: Gerrhonotus rhombifer Peters 1877; syn. García-Vázquez, Nieto-Montes de Oca, Bryson, Schmidt-Ballardo & Pavón-Vázquez 2018)
Contents: 10 species, of which 7 (70.0%) are endemic.
Endemism: 0% 100%
Remarks: Previously included the species now placed in the genera Abronia, Barisia, and Elgaria. Tihen (1949) revalidated the genera Abronia, Barisia, and Elgaria, and described a new genus, Coloptychon. Subsequent works (e.g., Waddick & Smith 1974; Good 1987) have supported the validity of Tihen's arrangement, which today is generally accepted, apart from Coloptychon, which has been synonymized with Gerrhonotus. Another nominal genus, Mesaspis, has been synonymized with Abronia.
Distribution: Costa Rica, Guatemala, Mexico (Aguascalientes, Chiapas, Chihuahua, Coahuila, Colima, Durango, Guanajuato, Guerrero, Hidalgo, Jalisco, Mexico State, Michoacan, Morelos, Nayarit, Nuevo Leon, Oaxaca, Puebla, Queretaro, San Luis Potosi, Sinaloa, Tamaulipas, Veracruz, Zacatecas), Panama, USA (Texas).

Gerrhonotus farri

Tamaulipan Alligator Lizard



2010 Gerrhonotus farri Bryson & Graham

Distribution: Mexico (Tamaulipas).

Gerrhonotus infernalis

Texas Alligator Lizard



1858 Gerrhonotus infernalis Baird
Gerrhonotus liocephalus infernalis Cope 1900
1989 Gerrhonotus liocephalus aguayoi Contreras Arquieta (Good 1994)

Remarks: Revalidated as a separate species by Good (1994). Previously included taylori. First reported from Chihuahua by Candelario Hernandez, Mendoza Pérez, Herr, Giovanetto, Hernandez & Graham (2017), although listed for the state already by Jones & Lovich (eds.) (2009).
Distribution: Mexico (Chihuahua, Coahuila, Durango, Guanajuato, Hidalgo, Nuevo Leon, Queretaro, San Luis Potosi, Tamaulipas), USA (Texas).

Gerrhonotus lazcanoi

Nuevo León Alligator Lizard

Nuevo León-Alligatorschleiche

Nuevo León-alligatorøgle

2017 Gerrhonotus lazcanoi Banda-Leal, Nevárez-de los Reyes & Bryson

Distribution: Mexico (Nuevo Leon).

Gerrhonotus liocephalus

Tlapancingo Alligator Lizard, (Wiegmann's Alligator Lizard)



1828 Gerrhonotus liocephalus Wiegmann
1829 Scincus ventralis Peale & Green (Good 1994)
1834 Gerrhonotus tessellatus Wiegmann [substitute name for Gerrhonotus liocephalus Wiegmann 1828] (Good 1994)
1946 Gerrhonotus liocephalus austrinus Hartweg & Tihen

Other common names:
austrinus: Alligator Snake Lizard
liocephalus: Eastern Alligator Lizard
Remarks: Previously included infernalis and ophiurus. Populations from Western Mexico (Colima, SW. Durango, Jalisco, Sinaloa) are of uncertain status, but tentatively referred to liocephalus (Good 1994).
Distribution: Guatemala, Mexico (Aguascalientes, Chiapas, Colima, Durango, Guanajuato, Guerrero, Hidalgo, Jalisco, Mexico State, Michoacan, Morelos, Nayarit, Oaxaca, Puebla, Sinaloa, Veracruz, Zacatecas).

Gerrhonotus lugoi

Coahuila Alligator Lizard, (Lugo's Alligator Lizard)



1970 Gerrhonotus lugoi McCoy
Barisia lugoi Waddick & Smith 1974

Distribution: Mexico (Coahuila, Nuevo Leon).

Gerrhonotus mccoyi

Cuatro Ciénegas Alligator Lizard


Cuatro Ciénegas-alligatorøgle

2018 Gerrhonotus mccoyi García-Vázquez, Contreras-Arquieta, Trujano-Ortega & Nieto-Montes de Oca

Remarks: Previously regarded as a population of infernalis.
Distribution: Mexico (Coahuila).

Gerrhonotus ophiurus

Serpentine Alligator Lizard, (Snake Lizard)



1866 Gerrhonotus ophiurus Cope
Gerrhonotus liocephalus ophiurus Cope 1900
1872 Gerrhonotus lemniscatus Bocourt (Smith & Taylor 1950)
1948 Gerrhonotus liocephalus loweryi Tihen (Good 1994)

Other common names:
loweryi: Lowery's Alligator Lizard
Remarks: Previously regarded as a subspecies of liocephalus (e.g., Wermuth 1969). Revalidated as a separate species by Good (1994).
Distribution: Mexico (Hidalgo, Nuevo Leon, Oaxaca, Puebla, Queretaro, San Luis Potosi, Tamaulipas, Veracruz).

Gerrhonotus parvus

Pigmy Alligator Lizard



1985 Gerrhonotus parvus Knight & Scudday
Elgaria parva Smith 1986

Remarks: Based on molecular evidence, Conroy, Bryson, Lazcano & Knight (2005) reclassified this species as a member of the genus Gerrhonotus.
Distribution: Mexico (Coahuila, Nuevo Leon).

Gerrhonotus rhombifer

Isthmian Alligator Lizard, Chiriqui Alligator Lizard, (Peters' Alligator Lizard)


Panamansk Alligatorøgle

1877 Gerrhonotus rhombifer Peters
Coloptychon rhombifer Tihen 1949

Remarks: Previously placed in a separate genus (Coloptychon), but recently reassigned to Gerrhonotus (García-Vázquez, Nieto-Montes de Oca, Bryson, Schmidt-Ballardo & Pavón-Vázquez 2018).
Distribution: Costa Rica, Panama.

Gerrhonotus taylori

Clarines Alligator Lizard, (Taylor's Alligator Lizard)



1954 Gerrhonotus liocephalus taylori Tihen
Gerrhonotus taylori Lemos-Espinal & Smith 2007

Remarks: Previously regarded as a synonym of infernalis (e.g., Good 1994).
Distribution: Mexico (Chihuahua, Durango).