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Víbora de pestañas del Merendón, Merendon palm-pitviper (Bothriechis thalassinus), Serpentario en Zoológico El Picacho

Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Lepidosauromorpha
Superordo: Lepidosauria
Ordo: Squamata
Subordo: Serpentes
Infraordo: Caenophidia
Superfamilia: Viperoidea

Familia: Viperidae
Subfamilia: Crotalinae
Genus: Bothriechis
Species: Bothriechis thalassinus

Bothriechis thalassinus Campbell & Smith, 2000: 1002

Holotype: UTA R-46526, subadult ♂.
Type locality: “Finca la Firmeza, Sierra de Caral, Izabal, Guatemala, 900 m (15°22’29" N, 88°41'44" W)” .

Primary references

Campbell, J.A. & Smith, E.N. 2000. A new species of arboreal pitviper from the Atlantic versant of northern Central America. Revista de Biología Tropical 48(4): 1001–1013. Reference page.


Uetz, P. & Hallermann, J. 2021. Bothriechis thalassinus. The Reptile Database. Accessed on 14 March 2018.

Vernacular names
English: Merendon palm-pitviper
español: Víbora de pestañas del Merendón

Bothriechis thalassinus is a venomous pitviper species native to Guatemala and Honduras.[1][2][3]


This is a medium-sized pitviper with a slender body and strong prehensile tail. Adults are usually 60–80 centimetres (24–31 in) long, with a maximum recorded length of 97 centimetres (38 in). It has 21-23 dorsal scale rows at mid-body. The head and body usually have a greenish dorsal color, shading to yellow-greenish along the sides. The belly is generally lighter in color: cream, yellow-green or pale green. The dorsal pattern may have irregular blotches, turquoise to black, or speckling that doesn't reach very far down the sides.[1][2] The head has two black stripes and black speckling on top, which are less visible towards the tail. Like all other pitvipers, B. thalassinus has heat sensitive organs, or loreal pits, located on either side of the head between the eye and the nostril.
Geographic range

Its range extends from eastern Guatemala to western Honduras. In eastern Guatemala it is found in several mountain ranges, including Sierra de Caral in Izabal and the Sierra del Merendón in Zacapa.[1][2]

Occurs in lower montane wet forest and lower montane moist forest at elevations of 885–1,730 metres (2,904–5,676 ft).[1][2]

Like other Bothriechis members, this species appears to be mainly nocturnal and arboreal.[1] It preys mostly on frogs, lizards, and sometimes small mammals or birds. B. thalassinus is not known to be an aggressive species, but may strike quickly when surprised or disturbed.[2]

Like most other pitvipers, B. thalassinus is ovoviviparous. Average litter size is probably less than 10–12 young per litter.[2]

The characteristics of its venom are not yet well known. It is mainly hemotoxic, and possibly contains mild neurotoxic or myotoxic factors. Seldom encountered by humans, there are very few reported bites of humans. Typical envenomation symptoms include local pain, swelling, mild local tissue necrosis, nausea, "tingling" of a digit or limb, and nausea. No confirmed deaths of humans have been reported for this species.[2]

Campbell, Jonathan A.; Smith, Eric N. (2000). "A new species of arboreal pitviper from the Atlantic versant of northern Central America". Revista de Biología Tropical. 48 (4): 1001–1013. ISSN 0034-7744. Retrieved 2 August 2010.
AFBMP. "Bothriechis thalassinus". AFBMP Living Hazards Database. AFBMP. Archived from the original on 2012-01-09. Retrieved 2010-08-01.
Bothriechis thalassinus at the Reptile Database. Accessed 11 July 2014.


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