Crotalus triseriatus

Crotalus triseriatus
Conservation status
	; Least Concern (IUCN 3.1)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Squamata
Suborder:	Serpentes
Family:	Viperidae
Genus:	Crotalus
Species:	C. triseriatus
Binomial name
	Crotalus triseriatus; (Wagler, 1830)
Synonyms
	Uropsophus triseriatus ; Wagler, 1830; Crot[alus]. triseriatus ; — Gray, 1831; Crotalus lugubris (part) ; Jan, 1859; Caudisona lugubris ; — Cope, 1860; C[audisona]. triseriata ; — Cope, 1867; Crotalus pallidus ; Günther, 1895; Crotalus triseriatus ; — Boulenger, 1896; Crotalus triseriatus triseriatus ; — Klauber In Githens & George, 1931; Crotalus triseriatus anahuacus ; — Gloyd, 1940[1];

Crotalus triseriatus is a venomous pit viper species found in Mexico. Two subspecies are currently recognized, including the nominate subspecies described here.[4]

Common names: Mexican dusky rattlesnake,[2] dusky rattlesnake[3]

Description

Adult male specimens of C. triseriatus commonly grow to a total length (including tail) greater than 60 cm (24 in), with females somewhat smaller. The maximum recorded total length is 68.3 cm (26.9 in).[2]

Geographic range

The species C. triseriatus is found in Mexico, along the southern edge of the Mexican Plateau in the highlands of the Transverse Volcanic Cordillera, including the states of Jalisco, México, Michoacán, Morelos, Nayarit, Puebla, Tlaxcala, and Veracruz. The type locality given by Wagler in 1830 is "Mexico". A restriction to "Alvarez, San Luis Potosí, Mexico" was proposed by H.M. Smith and Taylor (1950).[1]

Habitat

Crotalus triseriatus occurs in pine-oak forest, boreal forest, coniferous forest and, bunchgrass grasslands. On Volcán Orizaba, it is found at very high altitudes. There, the snow line comes down to about 4,572 m (15,000 ft), while green plants can be found up to 4,573 m (15,003 ft): the species has been found within this zone. However, it is most common at 2,700 to 3,350 metres (8,860 to 10,990 ft) in elevation.[2]

Conservation status

The species C. triseriatus is classified as Least Concern on the IUCN Red List of Threatened Species (v3.1, 2001).[5] Species are listed as such due to their wide distribution, presumed large population, or because they are unlikely to be declining fast enough to qualify for listing in a more threatened category. The population trend was stable when assessed in 2007.[6]

Feeding

Prey reportedly found in stomachs of C. triseriatus include a frog, a murid rodent (Neotomodon alstoni), lizards, other small mammals, crickets, and salamanders.[2]

Venom

Bite symptoms from C. triseriatus are reported to include intense pain, swelling, faintness, and cold perspiration.[2]

Subspecies

Subspecies[4]	Taxon author[4]	Common name[3]	Geographic range[1][2]
C. t. armstrongi	Campbell, 1979	western dusky rattlesnake	Mexico: Jalisco and Nayarit
C. t. triseriatus	(Wagler, 1830)	dusky rattlesnake	Mexico: Michoacán, Morelos, México, Puebla, Tlaxcala and Veracruz

Etymology

The subspecific name, armstrongi, is in honor of American herpetologist Barry L. Armstrong.[7]

Taxonomy

In the relatively recent past, two additional subspecies were described:[2]

C. t. anahuacus Gloyd, 1940 - currently regarded as a junior synonym of C. t. triseriatus
C. t. quadrangularis Harris & Simmons, 1978 - currently regarded as a junior synonym of C. aquilus

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References

McDiarmid RW, Campbell JA, Touré TA (1999). Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1. Washington, District of Columbia: Herpetologists' League. 511 pp. ISBN 1-893777-00-6 (series). ISBN 1-893777-01-4 (volume).
Campbell JA, Lamar WW (2004). The Venomous Reptiles of the Western Hemisphere. Ithaca and London: Comstock Publishing Associates. 870 pp. 1500 plates. ISBN 0-8014-4141-2.
Mehrtens JM (1987). Living Snakes of the World in Color. New York: Sterling Publishers. 480 pp. ISBN 0-8069-6460-X.
"Crotalus triseriatus". Integrated Taxonomic Information System. Retrieved 1 August 2007.
Crotalus triseriatus at the IUCN Red List. Accessed 13 September 2007.
2001 Categories & Criteria (version 3.1) at the IUCN Red List. Accessed 13 September 2007.
Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN 978-1-4214-0135-5. (Crotalus triseriatus armstrongi, p. 11).

External links

Crotalus triseriatus at the Reptarium.cz Reptile Database. Accessed 12 December 2007.

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[McD99-1] McDiarmid RW, Campbell JA, Touré TA (1999). Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1. Washington, District of Columbia: Herpetologists' League. 511 pp. ISBN 1-893777-00-6 (series). ISBN 1-893777-01-4 (volume).

[C&L04-2] Campbell JA, Lamar WW (2004). The Venomous Reptiles of the Western Hemisphere. Ithaca and London: Comstock Publishing Associates. 870 pp. 1500 plates. ISBN 0-8014-4141-2.

[Meh87-3] Mehrtens JM (1987). Living Snakes of the World in Color. New York: Sterling Publishers. 480 pp. ISBN 0-8069-6460-X.

[ITIS-4] "Crotalus triseriatus". Integrated Taxonomic Information System. Retrieved 1 August 2007.

[ICUN-5] Crotalus triseriatus at the IUCN Red List. Accessed 13 September 2007.

[ICUN-31-6] 2001 Categories & Criteria (version 3.1) at the IUCN Red List. Accessed 13 September 2007.

[7] Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN 978-1-4214-0135-5. (Crotalus triseriatus armstrongi, p. 11).