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Thamnophis cyrtopsis (KENNICOTT, 1860)

IUCN Red List - Thamnophis cyrtopsis - Least Concern, LC

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Higher TaxaColubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
SubspeciesThamnophis cyrtopsis cyrtopsis (KENNICOTT 1860)
Thamnophis cyrtopsis ocellatus (COPE 1880)
Thamnophis cyrtopsis collaris (JAN 1863) 
Common NamesE: Blackneck Garter Snake (cyrtopsis: Western Blackneck Garter Snake; ocellatus: Eastern Blackneck Garter Snake)
G: Gefleckte Strumpfbandnatter (cyrtopsis: Westliche Schwarznacken-Strumpfbandnatter; collaris: Halsband-Strumpfbandnatter; ocellatus: Östliche Schwarznacken-Strumpfbandnatter)
S: Jarretera Cuello-negro 
SynonymEutaenia cyrtopsis KENNICOTT 1860: 333
Thamnophis cyrtopsis — COPE 1861: 299
Thamnophis cyrtopsis cyclides COPE 1861
Eutaenia cyrtopsis — COPE 1886: 285
Thamnophis eques cyrtopsis — SMITH 1942: 108
Thamnophis eques cyrtopsis — GLOYD 1942
Thamnophis eques cyrtopsis — JAMESON & FLURY 1949
Thamnophis eques cyrtopsis — SMITH et al. 1950: 573
Thamnophis cyrtopsis — MILSTEAD 1953: 348
Thamnophis cyrtopsis cyclides — DAVIS & SMITH 1953
Thamnophis cyrtopsis — PETERS & OREJAS-MIRANDA 1970: 302
Thamnophis cyrtopsis — STEBBINS 1985: 208
Thamnophis cyrtopsis cyrtopsis — TANNER 1985: 654
Thamnophis cyrtopsis cyrtopsis — CONANT & COLLINS 1991: 169
Thamnophis cyrtopsis ocellatus — CONANT & COLLINS 1991: 170
Thamnophis cyrtopsis — LINER 1994
Thamnophis cyrtopsis cyrtopsis — TENNANT & BARTLETT 2000: 110
Thamnophis cyrtopsis cyrtopsis – LINER 2007
Thamnophis cyrtopsis — WALLACH et al. 2014: 721

Thamnophis cyrtopsis collaris (JAN 1863)
Tropidonotus (Eutainiaj collaris JAN 1863
Eutaenia cyrtopsis collaris — COPE 1892: 657
Thamnophis cyrtopsis collaris —VAN DENBURGH 1895
Thamnophis vicinus SMITH 1942: 104
Thamnophis cyrtopsis collaris — HARDY 1969: 204
Thamnophis vicinus — SMITH & SMITH 1976
Thamnophis cyrtopsis collaris — WEBB 1984
Thamnophis cyrtopsis collaris — TANNER 1985: 655
Thamnophis vicinus — LINER 1994
Thamnophis cyrtopsis collaris – LINER 2007

Thamnophis cyrtopsis ocellatus (COPE 1880)
Eutaenia cyrtopsis ocellata COPE 1880: 22
Thamnophis cyrtopsis ocellatus — CROTHER 2000
Thamnophis cyrtopsis ocellatus — TENNANT & BARTLETT 2000: 112
Thamnophis cyrtopsis ocellatus — JEANSONNE 2006
Thamnophis cyrtopsis ocellatus — MATTISON 2007: 146 
DistributionSW USA (S Colorado, Utah, Arizona, Texas, New Mexico), Mexico (Aguascalientes, Chiapas, Tamaulipas, San Luis Potosí, Quéretaro, Oaxaca, Jalisco, Sinaloa, Hidalgo, Guanajuato, Puebla, Guerrero, Nayarit, Morelos), Guatemala

collaris: Mexico (S Sonora SE, Durango, Chihuahua, through W and S Mexico to WC Guatemala)

cyrtopsis: USA (SW Texas, New Mexico); Mexico (Coahuila, Nuevo León, Chihuahua); Type locality: Rinconada, Coahuila.

ocellatus: SC Texas (Edwards Plateau west to the Big Bend); Type locality: Texas, nr. Helotes.

vicinus: Mexico (Michoacan)  
TypesHolotype: USNM 8067
Synitypes: (2) ANSP 10633-34; [ocellata]
Holotype: unlocated, originally deposited in "Bonn," not known to exist fide Webb 1980. Not in ZFMK fide W. Böhme, pers. comm., 14 March 2019 [collaris]
Syntypes: ANSP 10633-34 (Malnate 1971), formerly USNM 10528 (Cochran 1961), collected by Gabriel W. Marnock [ocellatus]
Holotype: USNM 5023 [Thamnophis cyrtopsis cyclides] 
CommentSubspecies: The former subspecies fulvus, postremus, and pulchrilatus have been raised to full species status.

Distribution: Listed for Honduras by Meyer & Wilson 1971 but not listed for Honduras by WILSON & MCCRANIE (2002). 
EtymologyThe specific name is derived from the Greek words cyrto, meaning "rounded" and opsis, meaning "appearance," in reference to the shape of the nuchal blotches (LEMOS-ESPINAL & DIXON 2013). 
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