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Gerrhonotus rhombifer PETERS, 1876

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Higher TaxaAnguidae (Gerrhonotinae), Diploglossa, Anguimorpha, Sauria, Squamata (lizards)
Subspecies 
Common NamesE: Isthmian Alligator Lizard 
SynonymGerrhonotus rhombifer PETERS 1876: 298
Gerrhonotus rhombifer — GÜNTHER 1885: 42
Gerrhonotus rhombifer — BOULENGER 1885: 276
Coloptychon rhombifer — TIHEN 1949: 584
Gerrhonotus rhombifer — WERMUTH 1969: 26
Coloptychon rhombifer — GOOD 1988
Coloptychon rhombifer — BAUER et al. 1995: 54
Coloptychon rhombifer — KÖHLER 2000: 41
Gerrhonotus rhombifer — GARCÍA-VÁZQUEZ et al. 2018
Coloptychon rhombifer — MATA-SILVA et al. 2019: 48 
DistributionW Panama, E Costa Rica

Type locality: Chiriqui [Panama]  
Reproductionoviparous 
TypesHolotype: ZMB 8655 
Diagnosis 
CommentIllustration on the cover of Herp. Rev. (issue 1), 2004.

Type species: Gerrhonotus rhombifer PETERS 1876 is the type species of the genus Coloptychon TIHEN 1949: 584.

Phylogenetics: GARCÍA-VÁZQUEZ et al. 2018 found Coloptychon to be nested within Gerrhonotus, hence they recommend to synonymize the two genera.

This species is known from only few specimens (Macey et al. 1999); Lamar et al. (2015) state that there is only 1 known specimen.

Distribution: see maps in Lamar et al. (2015), Blair et al. 2021. 
EtymologyNamed after Latin rhombus, a mathematical figure whose four sides and opposite angles are equal, a rhomb + Latin fero, to bear, carry. [“...Die Oberseite des Kopfes, breite unregelmässig rhomboidale, durch schmale schwarze Zwischenräume von einander getrennte Querbinden, welche auf dem Schwänze sich zu vollständigen Ringen entwickeln, von gelber Farbe...”]. 
References
  • Arias, Erick; Federico Bolaños 2014. A checklist of the amphibians and reptiles of San Isidro de Dota, Reserva Forestal Los Santos, Costa Rica. Check List 10 (4): 870-877 - get paper here
  • Bauer, A.M.; Günther,R. & Klipfel,M. 1995. The herpetological contributions of Wilhelm C.H. Peters (1815-1883). SSAR Facsimile Reprints in Herpetology, 714 pp.
  • Blair, Christopher; Robert W Bryson, Uri O García-Vázquez, Adrián Nieto-Montes De Oca, David Lazcano, John E Mccormack, John Klicka 2021. Phylogenomics of alligator lizards elucidate diversification patterns across the Mexican Transition Zone and support the recognition of a new genus. Biological Journal of the Linnean Society, 135 (1): 25–39 [print January 2022, online 25 November 2021] - get paper here
  • Boulenger, G.A. 1885. Catalogue of the lizards in the British Museum (Natural History). Vol. 2, Second edition. London, xiii+497 pp. - get paper here
  • Dwyer, Quetzal and Roel de Plecker. 2013. Geographic Distribution: Coloptychon rhombifer (isthmian alligator lizard). Herpetological Review 44 (4): 625 - 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 UO, Nieto‐Montes de Oca A, Bryson RW Jr, Schmidt‐Ballardo W, Pavón‐Vázquez CJ. 2018. Molecular systematics and historical biogeography of the genus Gerrhonotus (Squamata: Anguidae). J Biogeogr. XX:1–13 - get paper here
  • Good, D.A. 1988. Phylogenetic relationships among gerrhonotine lizards; an analysis of external morphology. Univ. California Publ. Zool. 121: 139 pp. - get paper here
  • Günther, A. C. L. G. 1885. Reptilia and Batrachia. Biologia Centrali-Américana. Taylor, & Francis, London, 326 pp. [published in parts from 1885-1902; reprint by the SSAR 1987] - get paper here
  • Köhler, G. 2000. Reptilien und Amphibien Mittelamerikas, Bd 1: Krokodile, Schildkröten, Echsen. Herpeton Verlag, Offenbach, 158 pp.
  • Lamar, William, W., César L. Barrio-Amorós, Quetzal Dwyer, Juan G. Abarca and Roel De Plecker. 2015. The gerrhonotine genus Coloptychon (Sauria: Anguidae). Mesoamerican Herpetology 2 (1): 88–104 - get paper here
  • Mata-Silva, V, DeSantis DL, García-Padilla E, Johnson JD, Wilson LD. 2019. The endemic herpetofauna of Central America: a casualty of anthropocentrism. Amphibian & Reptile Conservation 13 (1) [General Section]: 1–64 (e168) - get paper here
  • Peters, Wilhem Carl Hartwig 1876. Über neue Arten der Sauriergattung Gerrhonotus. Monatsber. königl. Akad. Wiss. Berlin. 1876 (Mai): 297-30 - get paper here
  • Sasa, M., Arias, E., & Chaves, G. 2025. Annotated list of amphibians and reptiles of Costa Rica: The role of the Museum of Zoology in cataloging the country’s herpetological diversity. Revista de Biología Tropical, 73(S2): e64536-e64536 - get paper here
  • Savage, J. M., & VILLA, J. 1986. An Introduction to the Herpetofauna of Costa Rica. Soc. Stud. Amphib. Rept. Contrib. Herpetol. No. 3, viii + 207 pp.
  • Savage, J.M. 2002. The Amphibians and Reptiles of Costa Rica: A Herpetofauna Between Two Continents, Between Two Seas. University of Chicago Press, 934 pp. [review in Copeia 2003 (1): 205]
  • Tihen, J. A. 1949. The genera of gerrhonotine Iizards. American Midland Naturalist 41: 579-601 - get paper here
 
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