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Bitis

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Bitis
Bitis arietans
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Viperidae
Subfamily: Viperinae
Genus: Bitis
Gray, 1842
Synonyms[1]

Bitis is a genus of venomous vipers found in Africa and the southern Arabian Peninsula.[1] It includes the largest and the smallest vipers in the world. Members are known for their characteristic threat displays that involve inflating and deflating their bodies while hissing and puffing loudly.[2] The type species for this genus is B. arietans,[1] which is also the most widely distributed viper in Africa.[3] Currently, 18 species are recognized.[4]

Members of the genus are commonly known as African adders,[2] African vipers,[3] or puff adders.

Description

Size variation within this genus is extreme, ranging from the very small B. schneideri, which grows to a maximum of 28 cm (11 in) and is perhaps the world's smallest viperid, to the very large B. gabonica, which can attain a length over 2 m (6.6 ft) and is the heaviest viper in the world.[2]

All have a wide, triangular head with a rounded snout, distinct from the neck, and covered in small, keeled, imbricated scales. The canthus is also distinct. A number of species have enlarged rostral or supraorbital scales that resemble horns. Their eyes are relatively small. They have large nostrils that are directed outwards and/or upwards. Up to six rows of small scales separate the rostral and nasal scales. All species have a well-developed supranasal sac. The fronts of the maxillary bones are very short, supporting only one pair of recurved fangs.[2][5]

These snakes are moderately to extremely stout. Their bodies are covered with keeled scales that are imbricated (overlapping) with apical pits. At midbody, the dorsal scales number 21–46. Laterally, the dorsal scales may be slightly oblique. The ventral scales, which number 112–153, are large, rounded, and sometimes have slight lateral keels. Their tails are short. The anal scale is single. The paired subcaudal scales number 16-37 and are sometimes keeled laterally.[2][5]

Geographic range

Puff adders are found in Africa and the southern Arabian Peninsula.[1]

Behavior

Bitis species are known for their behavior of inflating and deflating their bodies in loud hissing or puffing threat displays. They are terrestrial ambush predators, and appear sluggish, but can strike with amazing speed.[2] In contrast to the pitvipers of the subfamily Crotalinae, Bitis species appear to lack heat-sensitive organs and showed no differences in their behavior in laboratory tests towards warm and cool objects that mimicked prey.[6][7]

The rectilinear locomotion is very common in many Bitis species.

Reproduction

All members are viviparous and some give birth to large numbers of offspring.[2]

Venom

All members of this genus are dangerous – some extremely so.[2] At least six different polyvalent antivenoms are available. Five are produced by Aventis Pasteur (France), Pasteur Merieux (France) and SAIMR (South Africa). All of these specifically protect against B. arietans and four also cover B. gabonica.[8][9] At least one protects specifically against bites from B. nasicornis: India Antiserum Africa Polyvalent.[10] In the past, such antivenoms have been used to treat bites from other Bitis species, but with mixed results.[2]

Species

Image Species[1] Taxon author[1] Subsp.*[4] Common name Geographic range[1]
B. albanica Hewitt, 1937 0 Albany adder Republic of South Africa, Eastern Cape Province from Port Elizabeth to near Committees.
B. arietansT (Merrem, 1820) 1 Puff adder Most of sub-Saharan Africa south to the Cape of Good Hope, including southern Morocco, Mauritania, Senegal, Mali, southern Algeria, Guinea, Sierra Leone, Ivory Coast, Ghana, Togo, Benin, Niger, Nigeria, Chad, Sudan, Cameroon, Central African Republic, northern, eastern and southern Democratic Republic of the Congo, Uganda, Kenya, Somalia, Rwanda, Burundi, Tanzania, Angola, Zambia, Malawi, Mozambique, Zimbabwe, Botswana, Namibia, South Africa, also occurs on the Arabian peninsula, where it is found in southwestern Saudi Arabia and Yemen
B. armata (A. Smith, 1826) 0 Southern adder Republic of South Africa, Southwestern Western Cape, from West Coast National Park to De Hoop Nature Reserve
B. atropos (Linnaeus, 1758) 0 Berg adder Isolated populations in the mountainous areas of southern Africa: the Inyanga Highlands and Chimanimani Mountains of eastern Zimbabwe and nearby Mozambique, in South Africa along the Drakensberg Escarpments in the provinces of Transvaal, western Natal, Lesotho and eastern Free State, and in the southern coastal mountains of western and eastern Cape Province
B. caudalis (A. Smith, 1839) 0 Horned adder The arid region of southwest Africa: southwest Angola, Namibia, across the Kalahari Desert of southern Botswana, into northern Transvaal and southwestern Zimbabwe, in South Africa from the northern Cape Province south to the Great Karoo
B. cornuta (Daudin, 1803) 0 Many-horned adder The coastal region of southwest Namibia through west and southwest Cape Province in South Africa, with a few isolated populations in eastern Cape Province
B. gabonica (A.M.C. Duméril, Bibron & A.H.A. Duméril, 1854) 0 Gaboon viper Guinea, Ghana, Togo, Nigeria, Cameroon, DR Congo, Central African Republic, southern Sudan, Uganda, Kenya, eastern Tanzania, Zambia, Malawi, eastern Zimbabwe, Mozambique, northeast KwaZulu-Natal Province in South Africa
B. harenna Gower, Wade, Spawls, Böhme, Buechley, Sykes, & Colston, 2016 0 Bale Mountains adder Ethiopia
B. heraldica (Bocage, 1889) 0 Angolan adder The high plateau of central Angola
B. inornata (A. Smith, 1838) 0 Plain mountain adder Isolated population on the Sneeuberge, eastern Cape Province, South Africa
B. nasicornis (Shaw, 1792) 0 Rhinoceros viper From Guinea to Ghana in West Africa, and in Central Africa in the Central African Republic, southern Sudan, Cameroon, Gabon, Congo, DR Congo, Angola, Rwanda, Uganda and western Kenya
B. parviocula Böhme, 1977 0 Ethiopian mountain adder Known from only five localities in the highlands to southwest Ethiopia, at altitudes of 1700–2800 m.[11]
B. peringueyi (Boulenger, 1888) 0 Peringuey's desert adder The Namib Desert from southern Angola to Lüderitz, Namibia
B. rhinoceros (Schlegel, 1855) 0 West African Gaboon viper Guinea, Guinea-Bissau, Liberia, Sierra Leone, Ivory Coast, Ghana, Togo
B. rubida Branch, 1997 0 Red adder Several isolated populations in the northern Cape Fold Mountains and inland escarpment in Western Cape Province, South Africa
B. schneideri (Boettger, 1886) 0 Namaqua dwarf adder White coastal sand dunes from Namibia, near Lüderitz, south to Hondeklip Bay, Little Namaqualand, South Africa
B. worthingtoni Parker, 1932 0 Kenya horned viper Restricted to Kenya's high central Rift Valley at altitudes over 1500 m
B. xeropaga Haacke, 1975 0 Desert mountain adder Northwestern Cape Province in South Africa and the arid mountains of the lower Orange River basin, north into southern Namibia and Great Namaqualand as far as Aus

*) Not including the nominate subspecies.
T) Type species.

Taxonomy

Lenk et al. (1999) used molecular data (immunological distances and mitochondrial DNA sequences) to estimate the phylogenetic relationships among species of Bitis. They identified four major monophyletic groups for which they created four subgenera:[2]

For now, this division is of little consequence as far as the nomenclature is concerned. However, the definition of subgenera within a genus is often the sign of an impending split. Therefore, those interested in these snakes would do well to familiarize themselves with these new subgenera.[2]

References

  1. ^ a b c d e f g McDiarmid RW, Campbell JA, Touré T. 1999. Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1. Washington, District of Columbia: Herpetologists' League. 511 pp. ISBN 1-893777-00-6 (series). ISBN 1-893777-01-4 (volume).[page needed]
  2. ^ a b c d e f g h i j k Mallow D, Ludwig D, Nilson G. 2003. True Vipers: Natural History and Toxinology of Old World Vipers. Malabar, Florida: Krieger Publishing Company. 359 pp. ISBN 0-89464-877-2.[page needed]
  3. ^ a b Spawls S, Branch B. 1995. The Dangerous Snakes of Africa. Dubai: Ralph Curtis Books. Oriental Press. 192 pp. ISBN 0-88359-029-8.[page needed]
  4. ^ a b "Bitis". Integrated Taxonomic Information System. Retrieved 18 July 2006.
  5. ^ a b U.S. Navy. 1965. Poisonous Snakes of the World. Washington, District of Columbia: United States Government Printing Office. 212 pp.[page needed]
  6. ^ Safer, Adam B; Grace, Michael S (2004). "Infrared imaging in vipers: Differential responses of crotaline and viperine snakes to paired thermal targets". Behavioural Brain Research. 154 (1): 55–61. doi:10.1016/j.bbr.2004.01.020. PMID 15302110. S2CID 39736880.
  7. ^ Krochmal, Aaron R.; Bakken, George S.; LaDuc, Travis J. (2004). "Heat in evolution's kitchen: evolutionary perspectives on the functions and origin of the facial pit of pitvipers (Viperidae: Crotalinae)". Journal of Experimental Biology. 207 (24): 4231–8. doi:10.1242/jeb.01278. PMID 15531644.
  8. ^ Bitis arietans antivenoms at Munich AntiVenom INdex. Accessed 25 August 2006.
  9. ^ Bitis gabonica antivenoms at Munich AntiVenom INdex. Accessed 25 August 2006.
  10. ^ Miami-Dade Fire Rescue Venom Response Unit Archived 20 December 2008 at the Wayback Machine at VenomousReptiles.org Archived 9 April 2008 at the Wayback Machine. Accessed 5 September 2006.
  11. ^ Largen, M., and Spawls, S. 2010. The Amphibians and Reptiles of Ethiopia and Eritrea. Frankfurt am Main: Edition Chimara. ISBN 978-3-89973-466-9[page needed]

Further reading

  • Branch, William R (1999). "Dwarf adders of the Bitis cornuta-inornata complex (Serpentes: Viperidae) in Southern Africa". Kaupia. 8: 39–63.
  • Duméril A-M-C, Bibron G. 1844. Erpetologie Générale ou Histoire Naturelle Complete des Reptiles. Vol.6. Paris: Librarie Encyclopédique de Roret. 609 pp. [60].
  • Gray JE. 1842. Monographic Synopsis of the Vipers, or the Family Viperidæ. Zoological Miscellany, London 2: 68–71. [69].
  • Laurenti J.N. 1768. Specimen medicum, exhibens synopsin reptilium emendatum cum experimentis circa venena et antidota reptilium Austriacorum. Vienna: J.T. de Trattern. 214 pp. [103].
  • Lenk, Peter; Herrmann, Hans-Werner; Joger, Ulrich; Wink, Michael (1999). "Phylogeny and Taxonomic Subdivision of Bitis (Reptilia: Viperidae) based on molecular evidence". Kaupia. 8: 31–38.
  • Merrem B. 1820. Versuch eines Systems der Amphibien. Tentamen systematis amphibiorum. Marburg: J.C. Krieger. xv + 191 pp. [150], 1 pl.
  • Reuss T. 1939. "Berichtigungen und Ergänzungen zu meinen Arbeiten über Toxicophidier, 1938." Zeitschrift für Aquarien- und Terrarien-Vereine, Berlin (1), 13–14 [14].
  • U.S. Navy. 1991. Poisonous Snakes of the World. New York: Dover Books. (Reprint of US Govt. Printing Office, Washington D.C.) 232 pp. ISBN 0-486-26629-X.
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