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Xenosaurus agrenon KING & THOMPSON, 1968

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Higher TaxaXenosauridae, Diploglossa, Anguimorpha, Sauria, Squamata (lizards)
Subspecies 
Common NamesE: Mountain Knob-scaled Lizard
S: Xenosauro de Montaña 
SynonymXenosaurus grandis agrenon KING & THOMPSON 1968
Xenosaurus grandis agrenon — LINER & CASAS-ANDREU 2008
Xenosaurus agrenon — BHULLAR 2011
Xenosaurus agrenon — WOOLRICH-PIÑA & SMITH 2012
Xenosaurus agrenon — NIETO-MONTES DE OCA et al. 2022 
DistributionMexico (Oaxaca)

Type locality: Mexico: Rio Sol, Lachas, Jaquila, Oaxaca;  
Reproductionviviparous (not imputed, fide Zimin et al. 2022) 
TypesHolotype: INHS (= UIMNH) 69375 T. MacDougall; March-May, 1966. 
DiagnosisUnfortunately we had to temporarily remove additional information as this was scraped by multiple AI companies who sell that data to their customers. These details, e.g. detailed descriptions or comparisons (about 401 characters), are available for collaborators and contributors. Please contact us for details. 
CommentDistribution: see maps in WOOLRICH-PIÑA & SMITH 2012 and Nieto-Montes de Oca et al. 2022: 48 (Fig. 6). 
EtymologyNamed after agrenon (Greek, = "net") referring to the dorsal pattern in this form. 
References
  • Ballinger, R.E., G.R. Smith, and J.A. Lemos-Espinal 2000. Xenosaurus (Gray) Knob-scaled Lizards. Catalogue of American Amphibians and Reptiles (712): 1-3 - get paper here
  • Ballinger,R.E.,J.A.Lemos-Espinal, and G.R. Smith 2000. Xenosaurus grandis (Gray) Knob-scaled Lizard. Catalogue of American Amphibians and Reptiles (713): 1-4 - get paper here
  • Barrows, Shirley;Smith, Hobart M. 1947. The skeleton of the lizard Xenosaurus grandis (Gray). Univ. Kansas Sci. Bull. 31 (12): 227-281 - get paper here
  • Bhullar, B-A. S. 2011. The Power and Utility Of Morphological Characters In Systematics: A Fully Resolved Phylogeny of Xenosaurus and Its Fossil Relatives (Squamata: Anguimorpha). Bull. Mus. Comp. Zool. Harvard 160 (3): 65–181 - 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
  • Camarillo R., José L. 1990. Xenosaurus grandis en el Estado de Hidalgo, México. Boletín de la Sociedad Herpetológica Mexicana 2 (2): 17-18 - get paper here
  • Cope, E.D. 1867. Fifth contribution lo the herpetology of tropical America. Proc. Acad. nat. Sci. Philadelphia, 18 [1866]: 317-323 - get paper here
  • Gray,J.E. 1856. Notice of a new species of nocturnal lizard from Mexico. Ann. Mag. nat. Hist. (2) 18: 270 - 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
  • Haas, Georg 1960. On the trigeminus muscles of the lizards Xenosaurus grandis and Shinisaurus crocodilurus. American Museum novitates (2017) - get paper here
  • Jiménez-Arcos, V H; Martínez-Pérez, E R; Lozano-Aguilar, L E & Calzada-Arciniega, R A; 2019. Geographic Distribution: Xenosaurus agrenon (Mountain Knob-scaled Lizard) Mexico: Oaxaca: Municipality of San Pedro el Alto. Herpetological Review 50 (1): 104 - get paper here
  • King, F. W., & THOMPSON, F. G. 1968. A review of the American lizards of the genus Xenosaurus Peters. Bulletin of the Florida State Museum 12: 93-123. - get paper here
  • Köhler, G. 2000. Reptilien und Amphibien Mittelamerikas, Bd 1: Krokodile, Schildkröten, Echsen. Herpeton Verlag, Offenbach, 158 pp.
  • Lemos-Espinal, J. A., & Smith, G. R. 2025. The diversity and conservation status of amphibians and reptiles from the Mexican biogeographic province of Sierra Madre del Sur. Nature Conservation, 58: 101-127 - get paper here
  • Lynch, John D.; Smith, Hobart M. 1965. A new species of Xenosaurus (Reptilia: Xenosauridae) from the Isthmus of Tehuantepec, Mexico. Transactions of the Kansas Academy of Science 68 (1): 163-172 - get paper here
  • Mata-Silva, Vicente, Jerry D. Johnson, Larry David Wilson and Elí García-Padilla. 2015. The herpetofauna of Oaxaca, Mexico: composition, physiographic distribution, and conservation status. Mesoamerican Herpetology 2 (1): 6–62 - get paper here
  • Nieto-Montes de Oca, Adrián; Anthony J. Barley, Rubi N. Meza-Lázaro, Uri O. García-Vázquez, Joan G. Zamora-Abrego, Robert C. Thomson, Adam D. Leaché 2016. Phylogenomics and species delimitation in the knob-scaled lizards of the genus Xenosaurus (Squamata: Xenosauridae) using ddRADseq data reveal a substantial underestimation of diversity. Molecular Phylogenetics and Evolution 106: 241-253 - get paper here
  • Nieto-Montes de Oca, Adrián; Nicté Castresana-Villanueva, Luis Canseco-Márquez & Jonathan A. Campbell 2022. A New Species of Xenosaurus (Squamata: Xenosauridae) from the Sierra de Juárez of Oaxaca, Mexico Herpetologica 78(1): 40–50. - get paper here
  • Nieto-Montes de Oca, Adrián; Uri O. García-Vázquez, J. Jaime Zúñiga-Vega and Walter Schmidt-Ballardo 2013. A new species of Xenosaurus (Squamata: Xenosauridae) from the Sierra Gorda Biosphere Reserve of Querétaro, Mexico. Revista Mexicana de Biodiversidad 84: 485-498 - get paper here
  • Pérez Ramos, Edmundo; Lucia Saldaña de la Riva; Jonathan A. Campbell 2000. A new allopatric species of Xenosaurus (Squamata: Xenosauridae) from Guerrero, Mexico. Herpetologica 56 (4): 500-506 - get paper here
  • Peters, Wilhem Carl Hartwig 1861. Eine neue Gattung von Eidechsen, Xenosaurus fasciatus aus Mexico. Monatsber. königl. Akad. Wiss. Berlin. 1861 (April): 453-454 - get paper here
  • Phillips, C.A. 2003. HERPETOLOGICAL TYPE-SPECIMENS IN THE UNIVERSITY OF ILLINOIS MUSEUM OF NATURAL HISTORY: AN UPDATE TO THE PRIMARY TYPES. [type catalogue] University of Illinois Museum of Natural History, 17 pp.
  • Stuart,L.C. 1941. A new species of Xenosaurus from Guatemala. Proc. Biol. Soc. Washington 54: 47-48. - get paper here
  • Werler, John E. & Shannon, Frederick A. 1961. Two new lizards (genera Abronia and Xenosaurus) from the Los Tuxtlas Range of Veracruz, Mexico. Transactions of the Kansas Academy of Science 64 (2): 123-132 - get paper here
  • Woolrich-Piña, Guillermo A. and Geoffrey R. Smith 2012. A New Species of Xenosaurus from the Sierra Madre Oriental, Mexico. Herpetologica 68 (4): 551-559. - get paper here
  • Zimin, A., Zimin, S. V., Shine, R., Avila, L., Bauer, A., Böhm, M., Brown, R., Barki, G., de Oliveira Caetano, G. H., Castro Herrera, F., Chapple, D. G., Chirio, L., Colli, G. R., Doan, T. M., Glaw, F., Grismer, L. L., Itescu, Y., Kraus, F., LeBreton 2022. A global analysis of viviparity in squamates highlights its prevalence in cold climates. Global Ecology and Biogeography, 00, 1–16 - get paper here
 
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