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Overview

Distribution

Range Description

The species ranges along the Pacific versant of Mexico, from northern Sinaloa and adjacent Sonora southward to northern Costa Rica. Inland in Mexico it ranges in Morelos and northern Chiapas and scattered localities in the Yucatan Peninsula.
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Continent: Middle-America
Distribution: Mexico (Tamaulipas, coastal areas of S Sonora, Sinaloa, Nayarit, Jalisco, Morelos, Colima, Michoacan, Guerrero, Oaxaca, N Campeche, Yucatan, Quintana Roo),  N Belize, Guatemala (pacific coast), Honduras, Nicaragua, El Salvador, NW Costa Rica  
Type locality: Pacific coast of Guatemala.
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Source: The Reptile Database

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
The species prefers lowland areas of dry forests and tropical deciduous forest, thorn forest and savanna. It occurs in riparian vegetation. It can also be found in cultivated lands and grasslands.

Systems
  • Terrestrial
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Life History and Behavior

Life Expectancy

Lifespan, longevity, and ageing

Maximum longevity: 24.3 years (captivity)
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Agkistrodon bilineatus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 2
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
NT
Near Threatened

Red List Criteria

Version
3.1

Year Assessed
2007

Assessor/s
Lee, J. & Hammerson, G.A.

Reviewer/s
Cox, N., Chanson, J.S. & Stuart, S.N. (Global Reptile Assessment Coordinating Team)

Contributor/s

Justification
Listed as Near Threatened based on the extreme pressure from persecution leading to population reductions of close to 30% over the last 15 to 30 years (assuming a generation length of five to 10 years).
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Population

Population
It is an uncommon to rare species throughout its range.

Population Trend
Decreasing
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Threats

Major Threats
It is widely known and feared by the people of the Yucatan, which leads to human persecution of the species.
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Management

Conservation Actions

Conservation Actions
Its range in Mexico includes Calakmul Biosphere Reserve and Chamela biological station.
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Wikipedia

Agkistrodon bilineatus

Common names: cantil,[2][3] common cantil,[4] Mexican moccasin,[3] more.

Agkistrodon bilineatus is a venomous pitviper species found in Mexico and Central America as far south as Costa Rica.[1] Four subspecies are currently recognized, including the nominate subspecies described here.[5]

Description[edit]

A. b. bilineatus

These are heavy-bodied snakes, and share the same general body structure with cottonmouths. They average around 60 cm (23.6 in) in length and have a broad, triangular-shaped head with small eyes that have vertical pupils.

Coloration can vary, but most are brown or black, with darker brown or black banding, sometimes with white or cream-colored accents. A. taylori is known for being more elaborately patterned, often having distinct tan-colored banding, sometimes with orange or yellow accents that can almost appear gold in color. There are the following distinctive yellow and/or white lines on the head: a vertical line on the rostral and mental, a fine line on the canthus continuing above and beyond the eye to the neck, a broader line on the upper lip from the anterior nasal to the last labial.[6] Juveniles are almost always distinctly banded, with bright green or yellow tail tips, which they use to lure prey. As they age, their pattern and coloration fade and darken.

Common names[edit]

Cantil,[2][3] common cantil,[4] Mexican moccasin,[3] tropical moccasin,[7] Mexican cantil.[8]

The common name, cantil, is based on the Tzeltal word kantiil, which means "yellow lips."[2]

Geographic range[edit]

Mexico and Central America. On the Atlantic side it is found in Mexico in Tamaulipas, Nuevo León, possibly northern Veracruz and Chiapas (in the Middle Grijalva Valley). On the Yucatan Peninsula it occurs in Campeche, Yucatán, Quintana Roo and northern Belize. On the Pacific side it is found from southern Sonora in Mexico south through Guatemala, El Salvador, Honduras and Nicaragua to northwestern Costa Rica. On the Pacific side the distribution is almost continuous, while on the Atlantic side it is disjunct. The type locality given is "Pacific coast of Guatemala."[1]

Conservation status[edit]

This species is classified as Near Threatened (NT) on the IUCN Red List of Threatened Species (v3.1, 2001).[9] A species is listed as such when it has been evaluated against the criteria but does not qualify for Critically Endangered, Endangered or Vulnerable now, but is close to qualifying for, or is likely to qualify for a threatened category in the near future. The population trend is down. Year assessed: 2007.[10]

The primary ecological concern is habitat loss.

Behavior[edit]

Much like the American cottonmouth, with whom it shares a genus, this species has a reputation for having a nasty disposition and being extremely dangerous, a reputation probably not well deserved. They are generally shy by nature, and if threatened their first instinct is to rely on camouflage. If unable to do so they will use a threat display to ward off potential predators. The tightly coiled animal will raise the last several inches of its tail, this portion often being bright yellow or green in juveniles and a faded yellow or green in adults, the animal will then quickly flick its tail creating a loud whipping sound against its coils or surroundings. This particular behavior is very reminiscent of caudal luring, though in a more violent fashion and is often accompanied by a strike or less commonly a gaping display similar to that of A. piscivorus. They generally will only display these behaviors when given no other choice. In captivity A. bilineatus are often known for aggression stemming from their characteristic lack of predictability.

Reproduction[edit]

Breeding occurs in the spring, and like most other viper species, cantils are ovoviviparous, giving birth to 5–20 young at a time.

Captivity[edit]

Export from Mexico is not permitted, but cantils of both species are often captive bred, making them frequently available in the exotic pet trade. They are also well represented in zoos throughout North America and Europe.

Venom[edit]

According to Gloyd and Conant (1990), "this species is greatly feared throughout its range," in some areas even more so than Bothrops asper. In Sonora, Mexico, it is feared more than any other reptile. In Nicaragua, it is considered the country's most dangerous snake.[11]

Bite symptoms in general may include nothing more than local pain, swelling and discoloration, but those from adult specimens can cause massive swelling and necrosis. Campbell and Lamar (1989) suggested that, due to the necrosis, amputation may be required in one out of every six cases. Some bites were fatal within only a few hours. Gaige (1936) cites one case in which a woman in Motl, Yucatán, Mexico was bitten by a 30 cm (11¼ inches) specimen and died within a few hours. Alvarez del Toro (1983) reports gangrenous tissue falling away in fragments, eventually to expose the underlying bones, describing this is as "spontaneous amputation" of the necrotic wound.[11]

In Honduras, Cruz (1987) describes the bite symptoms as being similar to those of Bothrops species, although more severe considering the small size of these snakes. They include immediate and severe pain, oozing of blood from the fang punctures, considerable edema, epistaxis, bleeding of the gums, marked hematuria, general petechiae, shock, renal failure and local necrosis.[11]

Polyvalent Antivenom, produced by the Instituto Clodomiro Picado in Costa Rica, is used to treat bites from this species.[12]

Subspecies[edit]

Subspecies[5]Taxon author[5]Common name[2]Geographic range[2]
A. b. bilineatus(Günther, 1863)CantilThe Pacific Coastal Plain from southern Sonora in Mexico, southeast to Guatemala and El Salvador. Also occurs in the Mexican state of Morelos.
A. b. howardgloydiConant, 1984CastellanaThe dry Pacific lowlands of Honduras, Nicaragua and Costa Rica.
A. b. russeolusGloyd, 1972Yucatecan cantilThe Yucatán Peninsula in Mexico in the states of Campeche, Quintana Roo and Yucatán, as well as in northern Belize.
A. b. tayloriBurger & Robertson, 1951Taylor's cantilMexico, in the northeastern states of Nuevo Leon, San Luis Potosí and Tamaulipas.

Taxonomy[edit]

A new subspecies, A. b. lemosespinali, was described by H.M. Smith & Chiszar (2001) based on a single specimen from near Palma Sola, Veracruz, Mexico.[13]

See also[edit]

References[edit]

  1. ^ a b c McDiarmid RW, Campbell JA, Touré T. 1999. Snake Species of the World: A Taxonomic and Geographic Reference, vol. 1. Herpetologists' League. 511 pp. ISBN 1-893777-00-6 (series). ISBN 1-893777-01-4 (volume).
  2. ^ a b c d e Gloyd HK, Conant R. 1990. Snakes of the Agkistrodon Complex: A Monographic Review. Society for the Study of Amphibians and Reptiles. 614 pp. 52 plates. LCCN 89-50342. ISBN 0-916984-20-6.
  3. ^ a b c d Mehrtens JM. 1987. Living Snakes of the World in Color. New York: Sterling Publishers. 480 pp. ISBN 0-8069-6460-X.
  4. ^ a b Campbell JA, Lamar WW. 2004. The Venomous Reptiles of the Western Hemisphere. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates. ISBN 0-8014-4141-2.
  5. ^ a b c "Agkistrodon bilineatus". Integrated Taxonomic Information System. Retrieved 2 November 2006. 
  6. ^ Boulenger, G.A. 1896. Catalogue of the Snakes in the British Museum (Natural History). Volume III., Containing the...Viperidæ. Trustees of the British Museum (Natural History). London. xiv + 727 pp. + Plates I.-XXV. (Ancistrodon bilineatus, pp. 521–522.)
  7. ^ Gotch AF. 1986. Reptiles -- Their Latin Names Explained. Poole, UK: Blandford Press. 176 pp. ISBN 0-7137-1704-1.
  8. ^ Parker HW, Grandison AGC. 1977. Snakes -- a natural history. Second Edition. British Museum (Natural History) and Cornell University Press. 108 pp. 16 plates. LCCCN 76-54625. ISBN 0-8014-1095-9 (cloth), ISBN 0-8014-9164-9 (paper).
  9. ^ Agkistrodon bilineatus at the IUCN Red List. Accessed 13 September 2007.
  10. ^ 2001 Categories & Criteria (version 3.1) at the IUCN Red List. Accessed 13 September 2007.
  11. ^ a b c Warrell DA. 2004. Snakebites in Central and South America: Epidemiology, Clinical Features, and Clinical Management. In Campbell JA, Lamar WW. 2004. The Venomous Reptiles of the Western Hemisphere. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates. ISBN 0-8014-4141-2.
  12. ^ Agkistrodon bilineatus at Munich AntiVenom INdex (MAVIN). Accessed 27 June 2008.
  13. ^ Smith HM, Chiszar D.. 2001. A new subspecies of cantil (Agkistrodon bilineatus) from Central Veracruz, Mexico (Reptilia: Serpentes). Bulletin of the Maryland Herpetological Society, 37: 130-136.
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