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Gyalopion canum (COPE, 1860)

IUCN Red List - Gyalopion canum - Least Concern, LC

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Higher TaxaColubridae, Colubrinae, Colubroidea, Serpentes (snakes) 
Common NamesWestern Hooknose Snake, Chihuahuan Hook-nosed Snake 
SynonymPariaspis [?] canum COPE 1860: 241
Ficimia cana — CHRAPLIWY & WARD 1963
Gyalopion canum — STEBBINS 1985: 215
Gyalopion canum — CONANT & COLLINS 1991: 217
Gyalopion canum — LINER 1994
Gyalopion canum — CROTHER 2000: 62
Gyalopion canum — CROTHER et al. 2012 
DistributionUSA (SE Arizona, New Mexico, SW Texas),
Mexico (NE Sonora, N/E Chihuahua, Coahuila, NE Durango, N Zacatecas, San Luis Potosi, Nuevo Leon, Michoacan [HR 30: 113], Jalisco [HR 32: 59])

Type locality: Fort Buchanan, Arizona. Map legend:
TDWG region - Region according to the TDWG standard, not a precise distribution map.

NOTE: TDWG regions are generated automatically from the text in the distribution field and not in every cases it works well. We are working on it.
TypesHolotype: USNM 5284 
CommentReproduction: oviparous.

Type species: Pariaspis [?] canum COPE 1860: 241 is the type species of the genus Gyalopion COPE 1860. 
  • Chrapliwy, Pete S.;Ward, Arthur J., Jr 1963. New records of the western hook-nosed snake Ficimia cana (Cope), in West Texas. Southwestern Naturalist 8 (1): 52-53 - 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. 1860. Catalogue of the Colubridae in the Museum of the Academy of Natural Sciences of Philadelphia, with notes and descriptions of new species. Part II. Proc. Acad. Nat. Sci. Philadelphia 12: 241-266 - get paper here
  • Crother, B. I. 2000. Scientific and standard English names of amphibians and reptiles of North America north of Mexico, with comments regarding confidence in our understanding. Herpetological Circular 29: 1-82
  • 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
  • Degenhardt, William G.; C. W. Painter, and A. H. Price 1996. Amphibians and reptiles of New Mexico. Univ. New Mexico Press, 431 pp.
  • Dixon, James R. 2000. Amphibians and reptiles of Texas, second edition. Texas A&M University Press, 421 pp.
  • Enderson, Erik F.; Thomas R. Van Devender, Robert L. Bezy 2014. Amphibians and reptiles of Yécora, Sonora and the Madrean Tropical Zone of the Sierra Madre Occidental in northwestern Mexico. Check List 10 (4): 913-926 - get paper here
  • Hardy, L. M. 1976. Possible hybridization between Gyalopion canum and Ficimia publia (Serpentes: Colubridae). American Zoologist 16 (2): 16
  • Hardy, Laurence M. 1976. Gyalopion, G. canum, G. quadrangularis. Catalogue of American Amphibians and Reptiles (182): 1-3 - get paper here
  • Smith, Hobart M. 1944. Snakes of the Hoogstraal Expeditions to northern Mexico. Zoological Series of Field Museum of Natural History 29 (8): 135-152 - get paper here
  • Smith, J. R.;Thornton, Okla W., Jr;Dixon, James R. 1996. Geographic Distribution. Gyalopion canum. Herpetological Review 27 (1): 34 - get paper here
  • Stebbins,R.C. 1985. A Field Guide to Western Reptiles and Amphibians, 2nd ed. Houghton Mifflin, Boston
  • Tennant, A. & Bartlett, R.D. 2000. Snakes of North America - Eastern and Central Regions. Gulf Publishing, Houston, TX, 588 pp.
  • Thornton, Okla W., Jr.;Smith, Jerry R. 1993. New county records of amphibians and reptiles from West-Central Texas. Herpetological Review 24 (1): 35-36 - get paper here
  • Valdez-Lares, R.; R. Muñiz-Martínez; E.Gadsden; G. Aguirre-León; G. Castañeda-Gaytán; R. Gonzalez-Tr 2013. Checklist of amphibians and reptiles of the state of Durango, México. Check List 9 (4):714-724 - get paper here
  • Werler, John E.&; James R. Dixon 2000. Texas Snakes. University of Texas Press, 544 pages
  • Werning, Heiko 2012. Die Reptilien und Amphibien des Südwestens. Draco 13 (50): 18-60 - get paper here
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