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Crotalus molossus BAIRD & GIRARD, 1853

IUCN Red List - Crotalus molossus - Least Concern, LC

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Higher TaxaViperidae, Crotalinae, Alethinophidia, Serpentes, Squamata (snakes) 
SubspeciesCrotalus molossus estebanensis KLAUBER 1949
Crotalus molossus molossus BAIRD & GIRARD 1853
Crotalus molossus nigrescens GLOYD 1936
Crotalus molossus oaxacus GLOYD 1948 
Common NamesE: Black Tailed Rattlesnake, Northern Black Tailed Rattlesnake; nigrescens: Mexican black-tailed Rattlesnake; estebanensis: San Esteban Island Rattlesnake; oaxacus: Oaxacan Black-tailed Rattlesnake)
G: Schwarzschwanz-Klapperschlange 
SynonymCrotalus molossus molossus BAIRD & GIRARD 1853
Crotalus molossus BAIRD & GIRARD 1853: 10
Crotalus molossus molossus — GLOYD 1936
Crotalus molossus molossus — KLAUBER 1952: 84
Crotalus molossus molossus — STEBBINS 1985: 230
Crotalus molossus molossus — CONANT & COLLINS 1991: 237
Crotalus molossus molossus — LINER 1994
Crotalus molossus — MCDIARMID, CAMPBELL & TOURÉ 1999: 289
Crotalus molossus molossus — TENNANT & BARTLETT 2000: 528
Caudisona (Smythus) molossus — HOSER 2009
Crotalus molossus — WALLACH et al. 2014: 192

Crotalus molossus estebanensis KLAUBER 1949
Crotalus molossus estebanensis KLAUBER 1949
Crotalus molossus estebanensis — LINER 1994
Crotalus estebanensis — GRISMER 1999
Crotalus molossus estebanensis — BEAMAN & HAYES 2008
Caudisona (Smythus) estebanensis — HOSER 2009
Crotalus estebanensis — WALLACH et al. 2014: 190

Crotalus molossus nigrescens GLOYD 1936
Crotalus molossus nigrescens GLOYD 1936
Crotalus molossus nigrescens — KLAUBER 1952: 97
Crotalus molossus nigrescens — FUGLER 1956
Crotalus molossus nigrescens — KISSER 1980
Crotalus molossus nigrescens — LINER 1994
Crotalus molossus nigrescens — OLIVIER 2008
Crotalus molossus nigrescens — SPRANGER 2015: 8

Crotalus molossus oaxacus GLOYD 1948
Crotalus molossus oaxacus GLOYD 1948
Crotalus molossus oaxacus — LINER 1994
Crotalus molossus oaxacus — BEAMAN & HAYES 2008 
DistributionUSA (Arizona, New Mexico, SW Texas), Mexico (Hidalgo, Aguascalientes, Quéretaro, Tamaulipas, San Luis Potosí, Morelos, Jalisco, Guanajuato, Nuevo León etc.)

estebanensis: Isla San Esteban

nigrescens: S Sonora, SW Chihuahua, Durango, S Coahuila, south to Oaxaca and Veracruz, Tlaxcala (HR 34: 387); Type locality: Zacatecas, 6.4 km W La Colorada.

oaxacus: Oaxaca

molossus: Texas, S New Mexico; Type locality: Fort Webster, Santa Rita del Cobre, New Mexico. 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.
 
Reproductionviviparous. 
TypesHolotype: USNM
estebanensis: Holotype: SDSNH 26792.
nigrescens: Holotype: UMMZ 
CommentVenomous! GRISMER (1999) elevated estebanensis to full species status based on morphology and coloration using an evolutionary species concept.

size: typically 800 to 900 mm in total length (TL) but up to 1524 mm TL.

Nomenclature: Hoser’s 2009 classification and nomenclature has been rejected as unnecessary and unavailable by WÜSTER & BERNILS 2011. 
EtymologyThe specific name comes from a Latin word for a large ferocious dog from Molossia (Epirus), a preferred type of watchdog in Italy and Greece. The subspecific name, nigrescens, also is Latin and means "to become dark in color." (LEMOS-ESPINAL & DIXON 2013). The subspecies estebanensis and oaxacus are named after their localities. 
References
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