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Oxybelis aeneus
	Mexican vine snake in the El Palmar ecological reserve (Yucatán, Mexico).
Conservation status
	; Least Concern (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Squamata
Suborder:	Serpentes
Family:	Colubridae
Genus:	Oxybelis
Species:	O. aeneus
Binomial name
	Oxybelis aeneus; (Wagler, 1824)
Synonyms
	Dryinus aeneus ; Wagler, 1824; Coluber acuminatus ; Wied, 1824; Dryinus auratus ; Bell, 1825; Dryiophis aeneus ; — Garman, 1887; Oxybelis argenteus ; — Boulenger, 1896; Oxybelis argenteus ; — Bocourt, 1897; Oxybelis aeneus auratus ; — A.H. Wright & A.A. Wright, 1957; Oxybelis aeneus ; — H.M. Smith & Brodie, 1982;

Oxybelis aeneus, commonly known as the Mexican vine snake or brown vine snake, is a species of colubrid snake, which is endemic to the Americas.

Geographic range and habitat

O. aeneus is found from within the Atascosa, Patagonia, and Pajarito mountains of southern Arizona in the United States,^[6] through Mexico, to northern South America and Trinidad and Tobago.

Within Arizona, O. aeneus is exclusively affiliated with Madrean Evergreen Woodland communities and the upper reaches of adjacent semidesert grassland habitat. It is usually encountered in trees or shrubs on open, steep, and grassy slopes, but is also associated with wooded canyons, especially those with abundant vegetation. ^[7]

Description

O. aeneus is an extremely slender snake that reaches up to 1.9 metres (6.2 ft) in total length (including a long tail). Its color may vary from gray to brown with a yellow underside.

The body is laterally compressed.^[4] The snout is prominent, its length more than two times the diameter of the eye. There is 1 preocular, and there are 2 postoculars. There is 1 anterior temporal, and there are 2 posterior temporals.^[3] There is no loreal scale, and there are 8-10 upper labials.^[5]

The smooth dorsal scales are arranged in 17 rows at midbody.^[3]

Ventrals 173-205;^[5] subcaudals 150-188, divided (paired).^[3] The anal plate is divided in Arizona specimens,^[4] but is entire in South American specimens.^[3]

Common names

In Arizona O. aeneus is also called "pike-headed tree snake".^[4] In Trinidad and Tobago and Guyana, it is known as a "horse whip" or "vine snake".

Behavior

Mostly arboreal and diurnal, O. aeneus is quite often mistaken for a vine. When threatened, it sometimes releases foul smelling secretions from its vent.

Diet

O. aeneus feeds mainly on lizards (mostly anoles), but also eats frogs, small rodents and birds.^[8]

Venom

O. aeneus is a mildly venomous rear-fanged snake, but it is not considered dangerous to humans.

Reproduction

O. aeneus is oviparous. Clutch sizes of 3-6 have been published. In Arizona, hatching occurs in September.^[9]

References

^ Hammerson, G.A., Ines Hladki, A., Lee, J., Ramírez Pinilla, M., Renjifo, J., Urbina, N., Vazquez Díaz, J., Cisneros-Heredia, D.F., Gonzales, L., Catenazzi, A., Nogueira, C., Schargel, W., Rivas, G. & Murphy, J. 2019. Oxybelis aeneus. The IUCN Red List of Threatened Species 2019: e.T198390A2523934. https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T198390A2523934.en. Accessed on 19 September 2022.
^ "Oxybelis aeneus ". The Reptile Database
^ ^a ^b ^c ^d ^e Boulenger, G.A. (1896). Catalogue of the Snakes in the British Museum (Natural History). Volume III., Containing the Colubridæ (Opisthoglyphæ and Proteroglyphæ) ... London: Trustees of the British Museum (Natural History). (Taylor and Francis, printers). xiv + 727 pp. + Plates I-XXV. (Oxybelis argenteus, pp. 190-191).
^ ^a ^b ^c ^d Wright, A.H.; Wright, A.A. (1957). Handbook of Snakes of the United States and Canada. Ithaca and London: Comstock. 1,105 pp. (in 2 volumes) (Oxybelis aeneus auratus, pp. 563, 565-569, Figure 167, Map 44).
^ ^a ^b ^c Smith, H.M.; Brodie, E.D. Jr. (1982). Reptiles of North America: A Guide to Field Identification. New York: Golden Press. 240 pp. ISBN 0-307-13666-3 (paperback). (Oxybelis aeneus, pp. 188-189).
^ Brennan, Thomas C. "Brown Vine Snake (Oxybelis aeneus)". Online Field Guide to the Reptiles and Amphibians of Arizona. Retrieved 2009-06-25.
^ Brennan, Thomas C. "Brown Vine Snake (Oxybelis aeneus)". Online Field Guide to the Reptiles and Amphibians of Arizona. Retrieved 2023-01-30.
^ "Oxybelis aeneus (Brown Vine Snake)" (PDF). Sta.uwi.edu. Retrieved 9 April 2022.
^ Goldberg, S.R. (1998). "Reproduction in the Mexican vine snake Oxybelis aeneus ". Texas Journal of Science 50 (1): 51-56.