Middle American indigo snake

The Middle American indigo snake (Drymarchon melanurus), also known commonly as the blacktail cribo, is a species of large, nonvenomous, snake in the family Colubridae. The species is endemic to the southwestern United States, Mexico, Central America, and northern South America. In addition to the nominotypical subspecies, it has four other recognized subspecies, including D. m. erebennus commonly known as the Texas indigo snake.[3]

Middle American indigo snake
Drymarchon melanurus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Colubridae
Genus: Drymarchon
Species:
D. melanurus
Binomial name
Drymarchon melanurus
Subspecies

Five, see text.

Synonyms[2]
  • Spilotes melanurus
    A.M.C. Duméril, Bibron & A.H.A. Duméril, 1854
  • Spilotes corais melanurus
    — Cope, 1893
  • Morenoa orizabensis
    Dugès, 1905
  • Drymarchon corais melanurus
    — Amaral, 1929
  • Drymarchon melanurus
    — Wüster et al., 2001

Description

D. melanurus is a large species that can grow to a total length (including tail) of 1.80 m (6 ft) to over 2.40 m (8 ft). This species has predominantly olive-brown glossy dorsal scales evolving to black at the tail. The underside is a lighter olive-yellow, olive-tan color. D. melanurus has distinctive dark markings round the eyes, a vertical dark slash just behind the jaw. and a heavy diagonal dark slash on both sides of the neck.[4] The subspecies D. m. erebennus is predominantly solid black, though there can be lighter shaded variations.

Geographic range and habitat

The geographic range of D. melanurus extends from southern Texas southwards through the Gulf Coast of Mexico, the Yucatan peninsula, Guatemala and Belize. On the Pacific coast its range extends from Sinaloa in Mexico, southward to Guatemala, as far as Colombia, Venezuela and Ecuador.[1][4] Its elevational distribution goes from near sea level up to around 1,900 m asl (6,230 feet).[1] The subspecies D. m. erebennus is found in southern Texas and southwards into Mexico as far as Veracruz.

Subspecies

There are five subspecies of D. melanurus which are recognized as being valid, including the nominate subspecies.[3][2]

Nota bene: A trinomial authority in parentheses indicates that the subspecies was originally described in a genus other than Drymarchon.

References
  1. Lee, J.; Calderón Mandujano, R.; Lopez-Luna, M.A.; Vasquez Díaz, J. & Quintero Díaz, G.E. (2007). "Drymarchon melanurus". IUCN Red List of Threatened Species. 2007. Retrieved 8 February 2011.CS1 maint: ref=harv (link)
  2. Species Drymarchon melanurus at The Reptile Database . www.reptile-database.org.
  3. "Drymarchon melanurus ". Integrated Taxonomic Information System. Retrieved 2011-02-06.
  4. Wüster, Wolfgang; José Luís Yrausquin; Abraham Mijares-Urrutia (2001). "A new species of indigo snake from north-western Venezuela (Serpentes: Colubridae: Drymarchon)" (PDF). Herpetological Journal. 11: 157–165. Archived from the original (PDF) on 2007-02-05.

Further reading
  • Dugès A (1905). "Description d'un Ophidien nouveau du Mexique ( Morenoa orizabensis, g. et sp. nn.) ". Proceedings of the Zoological Society of London 1905 (2): 517-518. (Morenoa orizabensis, new species, pp. 517–5-8, Text-figure 77). (in French).
  • Duméril A-M-C, Bibron G, Duméril A[-H-A] (1854). Erpétologie générale ou histoire naturelle complète des reptiles. Tome septième. Première partie. Comprenant l'histoire des serpents non venimeux. Paris: Roret. xvi + 780 pp. (Spilotes melanurus, new species, pp. 224–225). (in French).
  • Heimes, Peter (2016). Snakes of Mexico: Herpetofauna Mexicana Vol. I. Frankfurt, Germany: Chimaira. 572 pp. ISBN 978-3899731002.
  • Smith HM (1941). "A review of the subspecies of the indigo snake (Drymarchon corais)". Journal of the Washington Academy of Sciences 31: 466-481. (Drymarchon corais rubidus, new subspecies, pp. 474–476; Drymarchon corais unicolor, new subspecies, pp. 470–472).
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