Causus bilineatus is a viper species endemic to south central Africa.[2] No subspecies are currently recognized.[3][4] Common names include lined night adder,[2] two-lined night adder,[3] and two-striped night adder.[3][5] Like all other vipers, it is venomous.
| Causus bilineatus | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | Squamata |
| Suborder: | Serpentes |
| Family: | Viperidae |
| Genus: | Causus |
| Species: | C. bilineatus
|
| Binomial name | |
| Causus bilineatus Boulenger, 1905
| |
| Synonyms | |
Description
editThe average total length (body + tail) is 30–50 cm (12–20 in) with a reported maximum of 65 cm (26 in).[2]
The head is slightly distinct from the neck, while the snout is fairly long and tapering. Midbody there are 15–18 rows of dorsal scales that are weakly keeled and have a soft and velvety appearance. The ventral scales number 122–141 in males and 128–144 in females. There are 18–30 subcaudals.[2]
The color pattern consists of an ash to auburn to brown ground color, overlaid with numerous irregular or vaguely rectangular black dorsal patches. These patches lie within two distinct and narrow pale stripes that run the length of the body. The belly color is dark to dark cream.[2]
Geographic range
editCausus bilineatus is found in Angola, Zambia, southern DR Congo, Rwanda, and western Tanzania.[3]
The type locality is given by Boulenger (1905) as "between Benguella and Bihé" (Angola). Bocage (1895) listed "Duque de Bragança, Quissange, Caconda, and Huilla" (Angola) for the localities.[1]
Habitat
editOccurs in moist savanna, forest-savanna environments, and swampy habitats. Wild-caught specimens found to have eaten clawed frogs, Xenopus, suggest a more aquatic nature than other species.[2]
Feeding
editPreys mostly upon toads and frogs, particularly the clawed frog, Xenopus.[2]
References
edit- ^ a b McDiarmid RW, Campbell JA, Touré T. 1999. Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1. Herpetologists' League. 511 pp. ISBN 1-893777-00-6 (series). ISBN 1-893777-01-4 (volume).
- ^ a b c d e f g Mallow D, Ludwig D, Nilson G. 2003. True Vipers: Natural History and Toxinology of Old World Vipers. Krieger Publishing Company. Malabar, Florida. 359 pp. ISBN 0-89464-877-2.
- ^ a b c d Causus bilineatus at the Reptarium.cz Reptile Database. Accessed 20 June 2021.
- ^ "Causus bilineatus". Integrated Taxonomic Information System. Retrieved 20 June 2021.
- ^ Spawls S, Branch B. 1995. The Dangerous Snakes of Africa. Ralph Curtis Books. Dubai: Oriental Press. 192 pp. ISBN 0-88359-029-8.
Further reading
edit- Bocage, J.V.B. du. 1895. Herpétologie d'Angola et du Congo. Ministère de la Marine et des Colonies. (Imprimerie National, printer.) Lisbon. xx + 203 pp. + Plates I-XIX. (Causus rhombeatus, part, p. 146.)
- Boulenger, G.A. 1905. A List of the Batrachians and Reptiles collected by Dr. W.J. Ansorge in Angola, with Descriptions of new Species. Ann. Mag. Nat. Hist., Seventh Series 16: 105–1156. (Causus rhombeatus var. bilineatus, p. 114.)