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The eastern indigo snake was first described by John Edwards Holbrook in 1842. For many years the genus Drymarchon was considered monotypic with one species, Drymarchon corais, with 12 subspecies, until the early 1990s when Drymarchon corais couperi was elevated to full species status according to the Society for the Study of Amphibians and Reptiles, in their official names list.
Falcon indigo snake — Drymarchon caudomaculatus Wüster, Yrausquin & Mijares-Urrutia, 2001 [10] Indigo snake — Drymarchon corais (F. Boie, 1827) Eastern indigo snake — Drymarchon couperi (Holbrook, 1842) [11] Gulf Coast indigo snake — Drymarchon kolpobasileus Krysko, Granatosky, Nuñez & D. J. Smith, 2016 [12]
The genus Drymarchon also contains some of the largest colubrids such as the eastern indigo snake (Drymarchon couperi) and the indigo snake (Drymarchon corais) which can both reach lengths of almost 3 m (9.8 ft). [77] [78] The first one mentioned may grow to 5 kg (11 lb) and more. [77]
The indigo snake (Drymarchon corais), also known as the yellow-tail cribo, is a species of snake in the family Colubridae. [3] This large colubrid snake is nonvenomous.
Pantherophis obsoletus, also known commonly as the western rat snake, black rat snake, pilot black snake, or simply black snake, [5] is a nonvenomous species of snake in the family Colubridae. The species is native to central North America. There are no subspecies that are recognized as being valid. [6] Its color variations include the Texas ...
Indigenous species include one species of crocodilian, 12 lizard species, 49 snake species, and 31 turtle species. Three native species have possibly been extirpated from the state. These include the eastern indigo snake , southern hognose snake and the mimic glass lizard .
Eastern brown snake (Pseudonaja textilis) The eastern brown snake (Pseudonaja textilis) has a venom LD 50 value of 0.053 mg SC (Brown, 1973) and a value of 0.0365 mg SC (Ernst and Zug et al. 1996). Average venom yield is 2–6 mg (Meier and White, 1995).
Until recently the unicolor cribo was considered a subspecies of the same species as the indigo snake Drymarchon corais unicolor. Unlike the indigo snake, which is dark blue to almost black, the unicolor cribo has a yellow or golden color with black facial and neck bar-like markings. This snake reaches a length of over nine feet.