Sibynophis sagittarius

Sibynophis sagittarius
	Specimen from Uttarakhand
Conservation status
	; Least Concern (IUCN 3.1)[1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Squamata
Suborder:	Serpentes
Family:	Colubridae
Genus:	Sibynophis
Species:	S. sagittarius
Binomial name
	Sibynophis sagittarius; (Cantor, 1839)
Synonyms
	Calamaria sagittaria; Cantor, 1839; Ablabes sagittarius; – Günther, 1864; Polyodontophis sagittarius; – Boulenger, 1890; Sibynophis sagittarius; – M.A. Smith, 1943; Sibynophis sagittaria [sic]; – Das, 1996[2][3];

Sibynophis sagittarius, commonly known as Cantor's black-headed snake after Theodore Cantor,[4][5] is a species of snake endemic to South Asia.[3]

Geographic range

It is found in central and northeastern India, Bhutan, Nepal, and Pakistan.[3] It is uncertain whether the species occurs or has occurred in Bangladesh.[6]

Description

Adults may attain 28 cm (11 inches) in total length, with a tail 6 cm (2⅜ inches) long.

As the common name implies, the dorsal surface of the head, including the nape of the neck, is black or dark brown, followed by a thin yellow nuchal collar. Also, there are two large elongate yellowish spots, one on each side of the back of the head. The upper surface of the body is pale brown, and the sides of the body are darker brown or gray. On each flank there is a thin black stripe separating the differently colored areas. A series of small black dots, widely separated, run down the vertebral row of dorsal scales. The underside is yellow, with a black dot at each outer end of every ventral.

The smooth dorsal scales, which lack apical pits, are arranged in 17 rows. Ventrals 205–228; anal plate divided; subcaudals 56–70, divided (paired).[7]

Habitat

Sibynophis sagittarius is found in forests.[5]

Behavior

It is not arboreal, but rather hunts by day on the forest floor.[5]

Diet

It feeds on insects, frogs, skinks, and snakes.[5]

Reproduction

An oviparous species, it lays a clutch of as many as six eggs.[5]

References

Mohapatra, P.; Srinivasulu, C.; Srinivasulu, B.; Thakur, S. & Wangyal, J. (2021). "Sibynophis sagittarius". The IUCN Red List of Threatened Species. IUCN. 2021: e.T194836A2364984. Retrieved 13 December 2021.
Boulenger, 1893, p. 187.
Sibynophis sagittarius at the Reptarium.cz Reptile Database. Accessed 14 January 2020.
Beolens, B.; Watkins, M.; Grayson, M. (2011). The Eponym Dictionary of Reptiles. Johns Hopkins University Press. p. 47. ISBN 978-1-4214-0135-5. Retrieved 9 June 2019.
Das, Indraneil. 2002. A Photographic Guide to Snakes and Other Reptiles of India. Ralph Curtis Books. Sanibel Island, Florida. 144 pp. ISBN 0-88359-056-5 (Sibynophis sagittaria [sic], p. 45.)
"Sibynopis sagittaricus". Snakes of Bangladesh. Retrieved 14 January 2020.
Boulenger, G.A. 1893. Catalogue of the Snakes in the British Museum (Natural History). Volume I., Containing the Families...Colubridæ Aglyphæ, Part. Trustees of the British Museum (Natural History). London. xiii + 448 pp. + Plates I.-XXVIII. (Polyodontophis sagittarius, pp. 181, 187-188.)