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Gyalopion quadrangulare (GÜNTHER, 1893)

IUCN Red List - Gyalopion quadrangulare - Least Concern, LC

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Higher TaxaColubridae, Colubrinae, Colubroidea, Serpentes (snakes) 
Subspecies 
Common NamesThornscrub or Desert Hooknose Snake 
SynonymFicimia quadrangularis GÜNTHER 1893: 99
Ficimia desertorum TAYLOR 1936: 51
Ficimia desertorum TAYLOR 1938: 494
Gyalopion desertorum — SMITH & TAYLOR 1941: 359
Gyalopion desertorum — ZWEIFEL & NORRIS 1955: 243
Gyalopion quadrangularis desertorum — DIXON & FUGLER 1959: 164
Ficimia quadrangularis desertorum — FUNK 1964
Gyalopion quadrangularis — STEBBINS 1985: 216
Gyalopion quadrangulare — LINER 1994
Ficimia quadrangularis — SHINE 1994
Gyalopion quadrangulare — CROTHER 2000
Gyalopion quadrangulare — CROTHER et al. 2012 
DistributionUSA (S Arizona),
Mexico (Sonora, Sinaloa)

Type locality: "Presidio, near Mazatlan, Sinaloa."

desertorum: Mexico (Sonora); Type locality: "about 12 kilometers northwest of Guaymas, Sonora." 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: BMNH 83.4.5.36/ 1946.1.1.75, female
Holotype: UIMNH [Ficimia desertorum] 
CommentSynonymy: after HARDY 1976. Gyalopion quadrangulare desertorum is not recognized by COLLINS 1997 either.

Reproduction: oviparous. 
EtymologyThe epithet quadrangularis is derived from Latin (quadr-, four; angul-, an angle, corner) in allusion to the shape of the dark dorsal blotches. 
References
  • Collins J T 1997. Standard Common and current scientific names for North American amphibians and reptiles, 2nd edition. Herpetological Circular 25: 1-40
  • 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
  • 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
  • Funk, Richard S. 1964. Fifth Ficimia quadrangularis desertorum Taylor in United States. Southwestern Naturalist 9 (2): 102-109 - get paper here
  • Greer, A. E. 1965. A note on Gyalopion quadrangularis in Nayarit, Mexico with remarks on the clinal variation within the species. Herpetologica 21 (1): 68-69 - 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
  • Hardy, Laurence M. 1976. Gyalopion, G. canum, G. quadrangularis. Catalogue of American Amphibians and Reptiles (182): 1-3 - 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. University of illinois Museumof Natural History, 17 pp.
  • Shine, Richard 1994. Sexual size dimorphism in snakes revisited. Copeia 1994 (2): 326-346 - get paper here
  • Stebbins,R.C. 1985. A Field Guide to Western Reptiles and Amphibians, 2nd ed. Houghton Mifflin, Boston
  • Taylor, Edward Harrison 1936. Description of a new Sonoran snake of the genus Ficimia, with notes on other Mexican species. Proc. Biol. Soc. Washington 49: 51-54 - get paper here
  • Taylor, Edward Harrison 1938. Notes on the herpetological fauna of the Mexican state of Sonora. Univ. Kansas Sci. Bull. 24 (19): 475-503 [1936] - get paper here
  • Webb, R.G. 1984. Herpetogeography in the Mazatlán-Durango Region of the Sierra Madre Occidental, Mexico. Vetrebrate Ecology and Systematics - A ribute to Henry S. Fitch; Museum of Natural History, University of Kansas, Lawrence, pp. 217-241
  • Werning, Heiko 2012. Die Reptilien und Amphibien des Südwestens. Draco 13 (50): 18-60 - get paper here
  • Zweifel,R.G. and Norris,K.S. 1955. Contributions to the herpetology of Sonora, Mexico:Descriptions of new subspecies of snakes (Micruroides euryxanthus and Lampropeltis getulus) and miscellaneous collecting notes. American Midland Naturalist 54: 230-249 - get paper here
 
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