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Trimorphodon vilkinsonii COPE, 1886

IUCN Red List - Trimorphodon vilkinsonii - Least Concern, LC
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Higher TaxaColubridae, Colubrinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Texas Lyre Snake
G: Texas-Lyraschlange
S: Serpiente de Tetalura 
SynonymTrimorphodon vilkinsonii COPE 1886: 286
Trimorphodon wilkinsonii — COPE 1887: 68
Trimorphodon upsilon — GÜNTHER in SALVIN & GODMAN 1895 (part.)
Trimorphodon vilkinsonii — COPE 1900: 1105
Trimorphodon vilkinsonii — DEGENHARDT 1957
Trimorphodon biscutatus vilkinsonii — GEHLBACH 1971: 209
Trimorphodon biscutatus vilkinsonii — SCOTT & MCDIARMID 1984
Trimorphodon biscutatus vilkinsoni — TANNER 1985: 659
Trimorphodon biscutatus vilkinsonii — CONANT & COLLINS 1991: 218
Trimorphodon biscutatus vilkinsonii — CROTHER 2000
Trimorphodon lambda vilkinsoni — WERLER & DIXON 2000
Trimorphodon biscutatus vilkinsonii — TENNANT & BARTLETT 2000: 465
Trimorphodon biscutatus vilkinsonii — TENNANT 2003: 475
Trimorphodon vilkinsonii — LADUC & JOHNSON 2003
Trimorphodon vilkinsonii — DEVITT et al. 2008
Trimorphodon vilkinsonii — WALLACH et al. 2014: 745
Trimorphodon vilkonsonii — BAEZA-TARIN et al. 2025 (in error) 
DistributionUSA (W Texas to S New Mexico),
Mexico (NE Chihuahua, Coahuila)

Type locality: “City of Chihuahua, Mexico”  
Reproductionoviparous 
TypesHolotype: USNM 14268, juvenile 
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 442 characters), are available for collaborators and contributors. Please contact us for details. 
CommentHabitat: partly arboreal (Harrington et al. 2018). 
EtymologyNamed after Edward Wilkinson, an amateur collector of historical relics and natural history specimens (Scott & McDiarmid 1984). 
References
  • Baeza-Tarín, F., Hernández, T., Herr, M., Giovanetto, L., Lazcano, D., & Graham, S. P. 2025. NEW DISTRIBUTION RECORDS OF AMPHIBIANS AND REPTILES OF MADERAS DEL CARMEN, COAHUILA, MEXICO. The Southwestern Naturalist, 68(4), 257-262 - get paper here
  • Baeza-Tarin, F; Hernandez, T; Giovanetto, L; Trevino, A E; Lazcano, D & Graham, S P 2018. Geographic Distribution: Trimorphodon vilkinsonii (Texas Lyresnake). Herpetological Review 49 (3): 508 - get paper here
  • Conant,R. & Collins,J.T. 1991. A Field Guide to Reptiles and Amphibians of Eastern/Central North America, 3rd ed. Houghton Mifflin (Boston/New York), xx + 450 p.
  • Cope, E.D. 1886. Thirteenth contribution to the herpetology of tropical America. Proc. Amer. Philos. Soc. 23: 271-287 [1885] - get paper here
  • Cope, E.D. 1887. Catalogue of batrachians and reptiles of Central America and México. Bull. US Natl. Mus. 32: 7-98 - get paper here
  • Cope, E.D. 1900. The crocodilians, lizards and snakes of North America. Ann. Rep. U.S. Natl. Mus. 1898: 153-1270 - get paper here
  • Crother, B. I. (ed.) 2012. Standard Common and Current Scientific Names for North American Amphibians, Turtles, Reptiles, and Crocodilians, Seventh Edition. Herpetological Circular 39: 1-92
  • Davis DR, LaDuc TJ 2018. Amphibians and reptiles of C. E. Miller Ranch and the Sierra Vieja, Chihuahuan Desert, Texas, USA. ZooKeys 735: 97-130 - get paper here
  • Degenhardt, William G.;Steele, G. Earl 1957. Additional specimens of Trimorphodon vilkinsoni from Texas. Copeia 1957 (4): 309-310 - get paper here
  • Devitt, Thomas J.; Travis J. LaDuc, and Jimmy A. McGuire 2008. The Trimorphodon biscutatus (Squamata: Colubridae) Species Complex Revisited: A Multivariate Statistical Analysis of Geographic Variation. Copeia 2008 (2): 370–387 - get paper here
  • Dixon, James R. 2000. Amphibians and reptiles of Texas, second edition. Texas A&M University Press, 421 pp.
  • Gatica-Colima, A., Macias-Rodríguez, E., Santiesteban-Martínez, A. & García-Elguera, G. 2012. Geographic distribution: Trimorphodon vilkinsonii (Chihuahuan lyresnake). Herpetological Review 43: 623 - get paper here
  • Gehlbach, F. R. 1971. Lyre snakes in the Trimorphodon biscutatus complex: a taxonomic resume. Herpetologica 27: 200-211. - get paper here
  • Hansen, R W; Bergquist, D & Stuart, J N; 2019. Geographic Distribution: Trimorphodon vilkinsonii (Texas Lyresnake) USA: New Mexico: Grant Co. Herpetological Review 50 (3): 531-532 - get paper here
  • Harrington, Sean M; Jordyn M de Haan, Lindsey Shapiro, Sara Ruane 2018. Habits and characteristics of arboreal snakes worldwide: arboreality constrains body size but does not affect lineage diversification. Biological Journal of the Linnean Society 125 (1): 61–71 - get paper here
  • Heimes, P. 2016. Snakes of Mexico. Chimaira, Frankfurt, 572 pp
  • Jameson, David H.;Flury, Alvin G. 1949. The reptiles and amphibians of the Sierra Vieja Range of southwestern Texas. Texas Journal of Science 1 (2): 54-77 - get paper here
  • LaDuc, Travis J. and Jerry D. Johnson. 2003. A taxonomic revision of Trimorphodon biscutatus vilkinsonii (Serpentes: Colubridae). Herpetologica 59 (3): 364-374 - get paper here
  • Lazcano D, Nevárez-de los Reyes M, García-Padilla E, Johnson JD, Mata-Silva V, DeSantis DL, Wilson LD. 2019. The herpetofauna of Coahuila, Mexico: composition, distribution, and conservation status. Amphibian & Reptile Conservation 13(2) [General Section]: 31–94 (e189) - get paper here
  • Murray, Ian W. and Christopher Newsom. 2011. Trimorphodon vilkinsonii (Texas lyresnake) mating. Herpetological Review 42 (3): 446 - get paper here
  • O’Shea, M. 2018. The Book of Snakes. Ivy Press / Quarto Publishing, London, - get paper here
  • Pilliod, D., Jeffries, M., Arkle, R. and Olson, D. 2024. Climate Futures for Lizards and Snakes in Western North America May Result in New Species Management Issues. Ecol Evol, 14: e70379 - get paper here
  • Price, Michael S. 2015. Geographic Distribution: Trimorphodon vilkinsonii (Texas lyresnake). Herpetological Review 46 (4): 578 - get paper here
  • Salvin, O. & Godman, F.D. 1895. Biologi Centrali-Americana or Contributions to the knowledge of the fauna and flora of Mexico and Central America. Porter and Dulan & Co., London.
  • Scott, N. J., & MCDIARMID, R. W. 1984. Trimorphodon biscutatus. Catalogue of American Amphibians and Reptiles (353): 1-4. - get paper here
  • Tanner, Wilmer W. 1985. Snakes of Western Chihuahua. Great Basin Naturalist 45 (4): 615-676 - get paper here
  • Tennant, A. 2003. Snakes of North America - Eastern and Central Regions, revised edition. Lone Star Books, 605 pp.
  • Vargas, Kyle. 2015. Geographic Distribution: Trimorphodon vilkinsonii (Texas lyresnake). Herpetological Review 46 (4): 578 - get paper here
  • Wallach, Van; Kenneth L. Williams , Jeff Boundy 2014. Snakes of the World: A Catalogue of Living and Extinct Species. [type catalogue] Taylor and Francis, CRC Press, 1237 pp.
  • Werler, John E. & James R. Dixon 2000. Texas Snakes. University of Texas Press, 544 pages
 
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