Middle American Indigo Snake

Drymarchon melanurus

The Middle American indigo snake, also known commonly as the blacktail cribo, is a species of large, nonvenomous, snake in the family Colubridae. The species is native 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.
A young Texas Indigo Snake (Drymarchon melanurus erebennus) on sandy ground  Drymarchon melanurus,Geotagged,Mexico,Middle American indigo snake,Summer

Appearance

"D. melanurus" is a large species that can grow to a total length of 1.80 m to over 2.40 m. 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.
The subspecies "D. m. erebennus" is predominantly solid black, though there can be lighter shaded variations.

Naming

There are five subspecies of "D. melanurus" which are recognized as being valid, including the nominate subspecies.
⤷ "Drymarchon melanurus erebennus"
⤷ "Drymarchon melanurus melanurus"
⤷ "Drymarchon melanurus orizabensis"
⤷ "Drymarchon melanurus rubidus" H.M. Smith, 1941
⤷ "Drymarchon melanurus unicolor" H.M. Smith, 1941

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

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. Its elevational distribution goes from near sea level up to around 1,900 m asl.
The subspecies "D. m. erebennus" is found in southern Texas and southwards into Mexico as far as Veracruz.

References:

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Status: Least concern
EX EW CR EN VU NT LC
Taxonomy
KingdomAnimalia
DivisionChordata
ClassReptilia
OrderSquamata
FamilyColubridae
GenusDrymarchon
SpeciesD. melanurus
Photographed in
Mexico