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Higher TaxaPhrynosomatidae, Phrynosomatinae, Phrynosomatini; Iguania, Sauria, Squamata (lizards)
Common Names 
Phrynosoma taurus sherbrookei — KÖHLER 2021 
DistributionMéxico (Guerrero)

Type locality: Tenexatlajco, municipality of Chilapa de Álvarez, Guerrero, México, 17.55437°N, 99.26973°W (datum 1⁄4 WGS84 for all localities), 1997 m elevation.  
Reproductionviviparous (not imputed, fide Zimin et al. 2022) 
TypesHolotype: MZFC 28101 (ADL 4173), a male, collected on 18 June 2012 by D. Arenas-Moreno, M.A. Días-Ojendis, M. García-Pareja, P.P. González-Alvarado, J. Grummer, A. Hernández-Ríos, R. Lara-Reséndiz, A.D. Leache ́, A. Nieto-Montes de Oca, and W.C. Sherbrooke. Paratypes. Ten specimens, all from Guerrero, México: three males (MZFC 27894, 27896, 27897) and four females (MZFC 27893, 27898–27900) from the same locality as the holotype (MZFC 27893–27894 collected on 2011 or 2012 by unrecorded collectors; MZFC 27896–27900 collected on 18 June 2012 by the same collectors as the holotype), and three specimens from the municipality of Olinalá: one female (MZFC 27895) from near La Encinera (Los Terrenos), 17.85202778°N, 98.75125°W, 1794 m elevation, collected on 19 July 2012 by W. Gramajo, and two specimens, one female and one juvenile of undetermined sex (MZFC 28303 and 28304, respectively) from 1 km NW Xixila, 17.94564°N, 98.85996°W, 1677 m elevation, collected on 1 October 2011 by E. Rosendo, V.H. Jiménez-Arcos, and S. Santa Cruz- Padilla. 
DiagnosisDiagnosis: Phrynosoma sherbrookei may be distinguished from P. blainvillii, P. cerroense, P. coronatum, P. douglasii, P. goodei, P. hernandesi, P. mcallii, P. modestum, P. orbiculare, P. platyrhinos, and P. solare by having keeled ventral scales (vs. ventral scales smooth in the other species).
Among the species with keeled ventral scales, Phrynosoma sherbrookei differs from P. asio and P. cornutum by having a smaller adult body size (snout–vent length [SVL] , 63.0 mm vs. SVL. 140.0 mm in the other species; Smith and Taylor, 1950), a shorter tail (tail length , 23% of SVL vs. tail length >= 50% of SVL in the other species; Smith and Taylor, 1950), and one lateral abdominal row of fringe scales (vs. two lateral abdominal rows of fringe scales in the other species; Smith and Taylor, 1950; Montanucci, 1987). Phrynosoma sherbrookei can be distinguished from P. ditmarsi by having well-developed occipital and temporal spines (vs. occipital and temporal spines absent, replaced by low, rounded protuberances in P. ditmarsi; Smith and Taylor, 1950; Reeve, 1952) and one or two short rows of sublabials (vs. five or six rows of sublabials in P. ditmarsi; Reeve, 1952).
Phrynosoma sherbrookei is most closely related to the two species in the Brevicauda clade (P. braconnieri and P. taurus). The new species can be distinguished from P. braconnieri by having the outer temporal part of the skull prolonged posteriodorsally into two temporal spines (vs. the outer temporal part of the skull prolonged posteriodorsally into three temporal spines in P. braconnieri), posterior chinshields larger than the postlabials (vs. posterior chinshields smaller than at least the posterior-most postlabial in P. braconnieri), and more numerous sublabials (10–18, x̅ = 14.7, n = 9) usually arranged in two rows (vs. 1–7, x̅ = 4.8, n = 9, sublabials in one row in P. braconnieri).
Phrynosoma sherbrookei differs from P. taurus by having a smaller adult body size (,54 and ,63 mm SVL in males and females, respectively, vs. 55.5–77.0 and 65.0–90.0 mm SVL in P. taurus males and females, respectively; Zamudio and Parra-Olea, 2000); by having outer temporal spines only slightly longer than the occipital spines (length ratio 1.1–1.6, x̅ = 1.4, n = 12) and not or barely exceeding the occipital spines in posterior extension (vs. outer temporal spines much longer than the occipital spines [length ratio 2.1–3.0, x̅ = 2.5, n = 6] and far exceeding the occipital spines in posterior extension in P. taurus), and in lacking enlarged postcloacal scales (vs. the presence of enlarged postcloacal scales in P. taurus). (Nieto-Montes de Oca et al. 2014) 
CommentSimilar species: P. braconnieri (morphologically) and P. taurus (genetically). 
EtymologyNamed after Wade C. Sherbrooke in recognition of his many and significant contributions to the knowledge of horned lizards. 
  • Bautista-Del Moral, A; Palacios-Aguilar, R & Santos-Bibiano, R; 2019. Geographic Distribution: Phrynosoma sherbrookei (Guerrero Horned Lizard) Mexico: Guerrero: Municipality of Atlixtlac. Herpetological Review 50 (3): 527-528 - get paper here
  • Lara-Reséndiz Rafael A., Arenas-Moreno Diego M., Beltrán-Sánchez Elizabeth, Gramajo Weendii, Verdugo-Molina Javier, Sherbrooke Wade C. et al. 2015. Selected body temperature of nine species of Mexican horned lizards (Phrynosoma). Rev. Mex. Biodiv. 86 (1): 275-278. - get paper here
  • Nieto-Montes de Oca, Adrián; Diego Arenas-Moreno, Elizabeth Beltrán-Sánchez, and Adam D. Leaché 2014. A New Species of Horned Lizard (Genus Phrynosoma) from Guerrero, México, with an Updated Multilocus Phylogeny. Herpetologica Jun 2014, Vol. 70, No. 2: 241-257. - get paper here
  • Palacios-Aguilar, Ricardo & OSCAR FLORES-VILLELA 2018. An updated checklist of the herpetofauna from Guerrero, Mexico. Zootaxa 4422 (1): 1-24 - 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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