Crotalus durissus

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South American rattlesnake
Crotalus durissus.jpg
South American rattlesnake (Crotalus durissus terrificus)
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Viperidae
Genus: Crotalus
Species:
C. durissus
Binomial name
Crotalus durissus
Crotalus durissus distribution.png
Synonyms
  • Crotalus Dryinas Linnaeus, 1758
  • [Crotalus] Durissus – Linnaeus, 1758
  • Caudisona orientalis – Laurenti, 1768
  • Caudisona Gronovii – Laurenti, 1768
  • Crotalus orientalis – Gmelin, 1788
  • Crotalus strepitans var. dryinas – Daudin, 1803
  • [Urocrotalon] durissus – Fitzinger, 1843
  • Uropsophus durissus – Gray, 1849
  • Crotalus durissus – Boulenger, 1896
  • Crotalus pulvis – Ditmars, 1905
  • [Crotalus] terrificus durissus – Amaral, 1929
  • Crotalus terrificus durissus – Amaral, 1929
  • [Crotalus] Gronovii – Klauber, 1936
  • Crotalus durissus dryinus – Hoge, 1966
  • Crotalus (Crotalus) durissus dryinus – J. Peters & Orejas-Miranda, 1970 [2] [3]

Crotalus durissus, known as the South American rattlesnake, [2] tropical rattlesnake, [4] and by other names, is a highly venomous pit viper species found in South America. It is the most widely distributed member of its genus. [2] Currently, seven subspecies are recognized. [5]

Contents

Taxonomy

The Guiana rattlesnake, previously recognized as C. d. dryinus, [3] is now considered a synonym for C. d. durissus. In fact, after the previous nominate subspecies for the C. d. durissus complex became the current nominate for Crotalus simus , which now represents its Mexican and Central American members, C. d. dryinus became the new nominate for the South American rattlesnakes as represented by C. durissus. [2] The subspecies previously known as C. d. collilineatus and C. d. cascavella were moved to the synonymy of C. d. terrificus following the publication of a paper by Wüster et al. in 2005.

Subspecies

Subspecies [ref 1] Taxon author [ref 1] Common nameGeographic range
C. d. cumanensis Humboldt, 1833Venezuelan rattlesnake [ref 2] Dry lowlands of Venezuela and Colombia
C. d. durissus Linnaeus, 1758South American rattlesnake [ref 3] Coastal savannas of Guyana, French Guiana and Suriname
C. d. marajoensis Hoge, 1966Marajon rattlesnake [ref 4] Known only from Marajo Island, Para State, Brazil
C. d. maricelae García Pérez, 1995Bolson arido de Lagunillas, Estado Mérida, Venezuela
C. d. ruruima Hoge, 1966Known from the slopes of Mount Roraima and Mount Cariman-Perú in Venezuela (Bolívar). A few specimens have been recorded in Brazil (Roraima). [ref 3]
C. d. terrificus (Laurenti, 1768)Cascavel [ref 2] Brazil south of the Amazonian forests, extreme southeastern Peru, Bolivia, Paraguay, Uruguay, northern Argentina
C. d. trigonicus Harris & Simmons, 1978Inland savannas of Guyana
  1. 1 2 "Crotalinae". Integrated Taxonomic Information System . Retrieved 26 October 2006.
  2. 1 2 Mehrtens JM. 1987. Living Snakes of the World in Color. New York: Sterling Publishers. 480 pp. ISBN   0-8069-6460-X.
  3. 1 2 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.
  4. ↑ Brown JH. 1973. Toxicology and Pharmacology of Venoms from Poisonous Snakes. Springfield, Illinois: Charles C. Thomas. 184 pp. LCCCN 73-229. ISBN   0-398-02808-7.

Description

A large Neotropical rattlesnake, it grows to a length of 1.5 m (4.9 ft), and rarely to a maximum length of 1.9 m (6.2 ft). [2] It has two distinct stripes starting at the base of the head. Within the lines, the color is lighter than the stripes.

The color and pattern of the body are quite variable, most with an 18–32 dorsal with a darker diamond, and rhombic spots, 25–33 (usually 27) rows of dorsal scale in the middle of the body. The head has a dark brown bar at the top, with a dark post-orbital band. The color of the belly varies, it can be white or yellowish, with light gray spots, becoming darker towards the tail. The tail is usually gray, with dark and vague crossed bands.

Behaviour

The species is more active at dusk and in the early hours of the morning; it is highly alert with little warning signs before striking, but like other rattlesnakes they are seldom aggressive towards humans. [6]

Reproduction

The South American rattlesnake has a seasonal reproductive cycle; competition between males (for access to females) begins around the summer's end, with copulation occurring during the fall, and the birth of the young taking place the following spring/summer. [7] Reproduction is ovoviviparous, giving birth to four to eight young. [6] In Roraima, Brazil it has been reported that the gestation lasts for five months, and they are capable of giving birth to up to 14 young. [8]

Diet

The diet consists mainly of rodents, likely due to the great abundance and availability of these animals throughout the year, in most areas where the snakes reside. In some regions, lizards of the Teiidae family are also part of the diet of C. durissus. [9]

Common names

Common names for the species include: South American rattlesnake, [2] tropical rattler, tropical rattlesnake, [4] neotropical rattlesnake, [10] Guiana rattlesnake (previously used for C. d. dryinus). [11] and in Spanish: víbora de cascabel, cascabel, cascabela, and also in Portuguese, cascavel. [2] In Suriname it is known as Sakasneki. [12]

Geographic range

Crotalus durissus is found in South America except the Andes Mountains. However, its range is discontinuous, [2] with many isolated populations in northern South America, including Colombia, Venezuela, Guyana, Suriname, French Guiana and northern Brazil. It occurs in Colombia and eastern Brazil to southeastern Peru, Bolivia, Paraguay, Uruguay, and northern Argentina (Catamarca, Córdoba, Corrientes, Chaco, Entre Rios, Formosa, La Pampa, La Rioja, Mendoza, Misiones, San Juan, San Luis, Santa Fe, Santiago del Estero and Tucumán). [3] It also occurs on some islands in the Caribbean, including Aruba. [2] The type locality given is "America." [3]

Habitat

It prefers savanna and semi-arid zones. It has been reported to occur in littoral xerophilous scrub, psammophilous and halophilous littoral grassland, thorny xerophilous scrub, tropophilous deciduous and semideciduous scrub, as well as tropophilous seasonal semideciduous forest in the northwest of Venezuela. In the Chaco region of Paraguay, it is found in the drier, sandier areas. [2]

Venom

C. d. terrificus in Avare, Sao Paulo, Brazil Cobra cascavel 280707- 23 04 40s - 49 06 55w REFON (4)a.jpg
C. d. terrificus in Avaré, São Paulo, Brazil

Bite symptoms are very different from those of Nearctic species [13] due to the presence of neurotoxins (PLA2s like crotoxin and myotoxins like crotamine) that cause progressive paralysis. [2] Bites from C. d. terrificus in particular can result in impaired vision or complete blindness, auditory disorders, ptosis, paralysis of the peripheral muscles, especially of the neck, which becomes so limp as to appear broken, and eventually life-threatening respiratory paralysis. The ocular disturbances are sometimes followed by permanent blindness. [13] Phospholipase A2 neurotoxins also cause damage to skeletal muscles and possibly the heart, causing general aches, pain, and tenderness throughout the body. Myoglobin released into the blood results in dark urine. Other serious complications may result from systemic disorders (incoagulable blood and general spontaneous bleeding), hypotension, and shock. [2] Hemorrhagins may be present in the venom, but any corresponding effects are completely overshadowed by the startling and serious neurotoxic symptoms. [13] Acute renal failure is considered as the main cause of death. [14] The mortality rate of cases without specific serum treatment is 72%, and 11% in cases with specific treatment. [15] [16]

According to Consroe et al. (1992), the LD50 value of the whole venom from C. durissus terrificus and C. durissus durissus is 0.13 mg/kg IV and 1.79 mg/kg IV respectively, using standardized methods with ICR/CD-1 female mice (outbred stock). Glenn and Straight also report LD50 values of 0.19 mg/kg IV, 0.25 mg/kg IP, and 1.4 mg/kg SC for C. durissus terrificus, and 1.43 mg/kg IV and 0.71 IP for C. durissus durissus . [17] Sanchez et al. (1992) report LD50 of male CF2 mice (outbred stock) of 0.093 mg/kg IV and 0.0485 mg/kg IP in C. durissus collilineatus, and 0.0965-0.27 mg/kg IV and 0.092-0.141 mg/kg IP in various populations of C. durissus terrificus (C. d. collilineatus now synonymous with C. d. terrificus). [18] Lima et al. (1991) reported on SC median lethal dose for whole venom of C. d. terrificus on inbred mouse strains: 0.193 and 0.171 mg/kg for Balb/c and C57BI/6 mice respectively, and 0.078 and 0.074 mg/kg for A/J and DBA/J mice respectively. [19] The LD50 of purified crotoxin is variously reported at 0.047 and 0.061 mg/kg IV in male and female CDC mice (outbred stock) respectively, [20] and 0.09 mg/kg IP. [21]

The lethal dose for 60 kg humans is possibly 18 mg, [22] while the venom yield is 20-100 mg. [23] [24] Sanchez et al also reported venom yield of 76 mg average (28-127 mg range) for C. durissus collilineatus, and 50 mg average (28-67 mg range) for C. durissus terrificus. [18] Roodt et al. (1998) reported an average venom yield of 140 mg for C. durissus terrificus snakes weighing an average of 1.9 kg (ranging from 0.69-3.2 kg), with an average of 7.39 (SD of 1.13) mg of venom per 100 grams of body weight. [25]

Crotoxin makes up anywhere from 48.5-89.4% of C. durissus terrificus venoms total proteome, though is typically 60-70% depending on locality. [26] Crotalus durissus collilineatus and C. durissus cascavella (both synonymous with C. durissus terrificus) crotoxin abundance is also reported at 67.4% (72% PLA2 total) and 72.5% (90.6% PLA2 total) respectively. [27] The myotoxin crotamine is also usually absent or present at various levels in C. durissus terrificus and C. durissus collilineatus; crotamine appears to be absent in C. durissus cascavella.

Crotalus durissus cumanensis has lower levels of neurotoxicity than the previously discussed subspecies, with PLA2s representing 32-44% of venom proteome across various populations. Some populations can also have very high abundance of crotamine, up to 55%, whereas others might have no crotamine. [28]

Crotalus durissus ruruima are highly dichotomous, showcasing Type I (hemorrhagic with 33% SVMP (snake venom metalloproteinases) and 10% PLA2), and Type II (neurotoxic with 21% PLA2 and 11% SVMP). Historically, yellow colored venom was associated with hemorrhagic Type I while white colored venom was associated with neurotoxic Type II. But the color of the venom is determined by the abundance of LAAO and cofactor pigments, which don't determine whether a venom is Type I or Type II. [29]

References

  1. ↑ Cacciali, P.; Caicedo, J.R.; Carreira, S.; Fitzgerald, L.; Gutiérrez-Cárdenas, P.; Kacoliris, F.; Montero, R.; Renjifo, J.; Rivas, G.; Rodríguez, J.; Scott, N. (2021). "Crotalus durissus". IUCN Red List of Threatened Species . 2021 e.T178477A44954627. doi: 10.2305/IUCN.UK.2021-3.RLTS.T178477A44954627.en . Retrieved 28 August 2024.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 Jonathan A. Campbell; William W. Lamar; Edmund D. Brodie (2004). The venomous reptiles of the Western Hemisphere. Comstock Pub. Associates. p. 1500. ISBN   978-0-8014-4141-7.
  3. 1 2 3 4 Roy W. MacDiarmid (1999). Snake Species of the World. Herpetologists' League. ISBN   978-1-893777-00-2.
  4. 1 2 Mehrtens JM. 1987. Living Snakes of the World in Color. New York: Sterling Publishers. 480 pp. ISBN   0-8069-6460-X
  5. ↑ "Crotalus durissus". Integrated Taxonomic Information System . Retrieved 28 November 2007.
  6. 1 2 "Living Hazards Database (LHD) – Search by Scientific Name" (PDF). Acq.osd.mil. Archived from the original (PDF) on 2 July 2017. Retrieved 18 March 2022.
  7. ↑ "Custos reprodutivos em Crotalus durissus (Serpentes, Viperidae) do Estado de São Paulo, Brasil". Bdtd.ibict.br. Archived from the original on 15 March 2022. Retrieved 18 March 2022. Crotalus durissus possui um ciclo reprodutivo sazonal com cópula ocorrendo no outono e a parturição no final no verão. Os machos competem por fêmeas receptivas.
  8. ↑ "Estudo aponta que em Roraima cascavéis têm hábitos noturnos e dois venenos: 'atributos únicos'". G1 (in Brazilian Portuguese). 3 January 2020. Retrieved 2020-11-01.
  9. ↑ Argaez, Maria Adelaida Hoyos (2012-06-22). A cascavel neotropical Crotalus durissus: uma abordagem morfológica e da historia natural em populações do Brasil (text thesis) (in Brazilian Portuguese). Universidade de São Paulo.
  10. ↑ U.S. Navy. 1991. Poisonous Snakes of the World. US Govt. New York: Dover Publications Inc. 203 pp. ISBN   0-486-26629-X
  11. ↑ Brown JH. 1973. Toxicology and Pharmacology of Venoms from Poisonous Snakes. Springfield, Illinois: Charles C. Thomas. 184 pp. LCCCN 73-229. ISBN   0-398-02808-7
  12. ↑ "Slangen van Suriname - Snakes of South America ( Suriname )". Suriname123.com.
  13. 1 2 3 Laurence Monroe Klauber (1997). Rattlesnakes: Their Habits, Life Histories, and Influence on Mankind (Second ed.). University of California Press. ISBN   978-0-520-21056-1.
  14. ↑ "Archived copy" (PDF). Archived from the original (PDF) on 2020-07-10. Retrieved 2020-09-25.{{cite web}}: CS1 maint: archived copy as title (link)
  15. ↑ "Symptomatology, Pathology, and Treatment of Snake Bites in South America", Venomous Animals and their Venoms, Academic Press, pp. 345–384, 1971-01-01, retrieved 2025-12-22
  16. ↑ "VAPAGuide - Biomedical database - Terrestrial snakes, Pit vipers - Crotalus durissus sspp". www.vapaguide.info. Retrieved 2025-12-22.
  17. ↑ Consroe, Paul; Gerrish, Kevin; Egen, Ned; Russell, Findlay E. (1992-05-01). "Intravenous dose-lethality study of American pit viper venoms in mice using standardized methods". Journal of Wilderness Medicine. 3 (2): 162–167. doi:10.1580/0953-9859-3.2.162. ISSN   0953-9859.
  18. 1 2 Sanchez, E. F.; Freitas, T. V.; Ferreira-Alves, D. L.; Velarde, D. T.; Diniz, M. R.; Cordeiro, M. N.; Agostini-Cotta, G.; Diniz, C. R. (1992-01-01). "Biological activities of venoms from South American snakes". Toxicon. 30 (1): 95–103. Bibcode:1992Txcn...30...95S. doi:10.1016/0041-0101(92)90505-Y. ISSN   0041-0101. PMID   1595082.
  19. ↑ D'Império Lima, Maria Regina; Cristina dos Santos, Maria; Tambourgi, Denise Vilarinho; Marques, Thaís; Dias da Silva, Wilmar; Kipnis, Thereza (1991-01-01). "Susceptibility of different strains of mice to South American rattlesnake (Crotalus durissus terrificus) venom: Correlation between lethal effect and creatine kinase release". Toxicon. 29 (6): 783–786. Bibcode:1991Txcn...29..783D. doi:10.1016/0041-0101(91)90070-8. ISSN   0041-0101. PMID   1926179.
  20. ↑ Aird, Steven D.; Kaiser, Ivan I. (1985-01-01). "Comparative studies on three rattlesnake toxins". Toxicon. 23 (3): 361–374. Bibcode:1985Txcn...23..361A. doi:10.1016/0041-0101(85)90020-0. ISSN   0041-0101. PMID   4024144.
  21. ↑ Okamoto, M; Viskatis, L J; de la Roza, G; Vidal, J C (1993-04-01). "Induction of tolerance to crotoxin in mice". The Journal of Pharmacology and Experimental Therapeutics. 265 (1): 41–46. doi:10.1016/S0022-3565(25)38138-3. ISSN   0022-3565. PMID   8474024.
  22. ↑ Butantan, Instituto. Coletanea de trabalhos do Instituto Butantan. Instituto Butantan.
  23. ↑ "LD50 of Venomous Snakes | snakeDB". snakedb.org. Retrieved 2025-12-23.
  24. ↑ Nelson →, Rob. "Most Venomous Snakes in the World". Untamed Science. Retrieved 2025-12-23.
  25. ↑ de Roodt, Adolfo R; Dolab, Jorge A; Galarce, Pedro P; Gould, Eduardo; Litwin, Silvana; Dokmetjian, J. Christian; Segre, Liliana; Vidal, Juan C (1998-12-01). "A study on the venom yield of venomous snake species from Argentina". Toxicon. 36 (12): 1949–1957. Bibcode:1998Txcn...36.1949D. doi:10.1016/S0041-0101(98)00119-6. ISSN   0041-0101. PMID   9839679.
  26. ↑ Fusco, Luciano S.; Neto, Emidio B.; Francisco, Aleff F.; Alfonso, Jorge; Soares, Andreimar; Pimenta, Daniel C.; Leiva, Laura C. (2020-09-01). "Fast venomic analysis of Crotalus durissus terrificus from northeastern Argentina". Toxicon: X. 7 100047. Bibcode:2020TxcnX...700047F. doi:10.1016/j.toxcx.2020.100047. ISSN   2590-1710. PMC   7322346 . PMID   32613194.
  27. ↑ Boldrini-França, Johara; Corrêa-Netto, Carlos; Silva, Marliete M. S.; Rodrigues, Renata S.; De La Torre, Pilar; Pérez, Alicia; Soares, Andreimar M.; Zingali, Russolina B.; Nogueira, Romildo A.; Rodrigues, Veridiana M.; Sanz, Libia; Calvete, Juan J. (2010-08-05). "Snake venomics and antivenomics of Crotalus durissus subspecies from Brazil: Assessment of geographic variation and its implication on snakebite management". Journal of Proteomics. 73 (9): 1758–1776. Bibcode:2010JProt..73.1758B. doi:10.1016/j.jprot.2010.06.001. ISSN   1874-3919. PMID   20542151.
  28. ↑ Ariadna, Rodríguez-Vargas; Nohora, Vega; Edgar, Reyes-Montaño; Gerardo, Corzo; Edgar, Neri-Castro; Herlinda, Clement; Francisco, Ruiz-Gómez (August 2022). "Intraspecific Differences in the Venom of Crotalus durissus cumanensis from Colombia". Toxins. 14 (8): 532. doi: 10.3390/toxins14080532 . ISSN   2072-6651. PMC   9416679 . PMID   36006194.
  29. ↑ Colombini, Mônica; Rocha, Anderson M.; Freitas-de-Sousa, Luciana A.; Chaves, Alison F. A.; Serrano, Solange M. T.; Souza, Vinicius C.; Viala, Vincent L.; Junqueira-Azevedo, Inácio L. M.; Cerni, Felipe A.; Sartim, Marco A.; Sachett, Jacqueline A. G.; Monteiro, Wuelton M.; Grazziotin, Felipe G.; Wen, Fan Hui; Pucca, Manuela B. (2025-08-01). "Phenotypic dichotomy in Crotalus durissus ruruima venom and potential consequences for clinical management of snakebite envenomations". PLOS Neglected Tropical Diseases. 19 (8) e0013296. doi: 10.1371/journal.pntd.0013296 . ISSN   1935-2735. PMC   12327661 . PMID   40749023.

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