Large and stout, this terrestrial species reportedly exceeds 2 m (6.6 ft) in total length, although the verified maximum is 169 cm (67 in). Most specimens are 80–120 cm (31–47 in) in total length, with females being significantly longer and heavier than males.[3]
The color pattern is exceedingly variable. The ground color may be brown, tan or gray, sometimes with an olive cast. The top of the head is usually chocolate brown to almost black with a range of transverse and longitudinal tan to white markings. On the body, there is a series of 22-28 dorsolateral markings that are chocolate brown to black in color and boldly bordered in cream or white. Along the vertebral line, these markings may either oppose or alternate. Each marking is widened and invaded from underneath by the paler ground color so that it either looks like a cross, encloses a darker blotch, or divides the marking into three parts to give it the shape of a headphone. On the tail, the pattern fuses to form a zigzag pattern. In some specimens, the pattern is so concentrated that there is no difference in color between the markings and the interspaces. The ventral surface includes a dark brown to black stripe that starts at the neck and runs down to the tail tip. Aberrant specimens, described by Lema (1960, 1987), had dark dorsal stripes running down the length of the body.[3]
Common names
Urutu,[3]wutu,[4] crossed pit viper.[5] The common names urutu and wutu refer to the crescent markings on the body.[7]
In Argentina, it is referred to as víbora de la cruz[8] and yarará grande. In Brazil it is called boicoatiara, boicotiara (Tupi dialect), coatiara, cotiara (southern Brazil), cruzeira, cruzeiro, jararaca de agosto (Rio Grande do Sul, Lagoa dos Patos region), jararaca rabo-de-porco (Rio Grande do Sul), and urutu. In Paraguay it is called mbói-cuatiá, mbói-kwatiara (Gí dialect), and yarará acácusú (Guaraní dialect). In Uruguay it is referred to as crucera, víbora de la cruz and yarará.[3]
Occurs in tropical and semitropical forests, as well as temperate deciduous forests. According to Gallardo (1977), it prefers marshes, low-lying swamps, riparian zones and other humid habitats. It is also said to be common in sugarcane plantations. It is found in a variety of habitats depending on the latitude, including open fields and rocky areas in the Sierra de Achiras in Córdoba and the Sierra de la Ventana in Buenos Aires in Argentina, fluvial areas, grasslands and cerrado. However, it is usually absent in dry environments.[3]
Reproduction
Females, depending on their size, give birth to varying numbers of live young.[7] Leitão de Araujo and Ely (1980) reported on two litters that had average weights of 17.4 grams (0.61 oz) and 17.5 grams (0.62 oz) and average total lengths of 31.0 centimetres (12.2 in) and 31.3 centimetres (12.3 in), with captive females giving birth to 3-12 young. Cardinale and Avila (1997) collected one female in 1995 that was found to contain 26 embryos. Haller and Martins (1999) determined that the species produces 1-24 offspring at a time.[3] Neonates are identical to the adults, except that they are more brightly colored.[7] Neonates are capable of a venomous strike immediately when they are born.
Venom
An important cause of snakebite within its range, bites are rarely fatal but frequently cause severe local tissue damage.[3] Although Spix and Martius (1824) found that it had a reputation for being one of the most venomous snakes in Brazil, its bite "said to occasion almost certain death", the statistics tell a different story. In his survey of 6,601 snakebite cases in Central and South America, Fonseca (1949) found that 384 were attributed to this species and that, of that number, only eight were fatal (2%).[9]
In a study by Baub et al. (1994) of the case histories of 32 patients bitten by this species and admitted to the hospital in Catanduva, São Paulo, Brazil, all developed local pain and swelling. Furthermore, in 97% of all cases the blood clotting time was prolonged (more than 12 minutes), 41% had bleeding (usually from the gums), 32% had local blistering and 9% had necrosis. In all cases, specific antivenin was used and there were no deaths. These findings contrast with other reports involving much more tissue damage. Silva Jr. (1956) includes a description of a Brazilian patient with gangrene on the hand and forearm that required amputation, as well as another bitten four years previously who had scarring over the anterior tibial compartment. Abalos and Pirosky (1963) considered this species to be responsible for many of the total number of snakebite cases in Argentina and included a picture of a young boy, bitten below the knee, with the bare fibula and tibia exposed.[9] In 2004, a 44-year-old woman died from a bleed in the brain after getting bitten at her home. The median lethal dose of this species in Brazil varies according to the location, from 2.2 mg/kg (3.5×10−5 oz/lb) to 4.1 mg/kg (6.6×10−5 oz/lb).[10]
Through genome sequencing of the species, 59 toxin genes were annotated from 16 toxin families. Among the expressed toxins, phospholipase A2, snake venom metalloproteinases, snake venom serine proteases, and C-type lectins composed the major components of the venom gland transcriptome.[11]
References
^ abcMcDiarmid RW, Campbell JA, Touré T. 1999. Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1. Herpetologists' League. 511 pp. ISBN1-893777-00-6 (series). ISBN1-893777-01-4 (volume).
^ abcdefghijkCampbell JA, Lamar WW. 2004. The Venomous Reptiles of the Western Hemisphere. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates. ISBN0-8014-4141-2.
^ abBrown JH. 1973. Toxicology and Pharmacology of Venoms from Poisonous Snakes. Springfield, Illinois: Charles C. Thomas. 184 pp. LCCCN 73-229. ISBN0-398-02808-7.
^ abU.S. Navy. 1991. Poisonous Snakes of the World. US Govt. New York: Dover Publications Inc. 203 pp. ISBN0-486-26629-X.
^ abWarrell 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. ISBN0-8014-4141-2.
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