The fascinating Cantor's Black-headed Snake, Sibynophis sagittarius, is a species of snake found in South Asia. This non-venomous snake, a member of the Sibynophiidae family, is well-known for its unique physical characteristics and broad geographic distribution. This article reviews the physiological characteristics, behaviour, distribution, and scientific categorization of this intriguing species.

Sibynophis sagittarius (Source:- Indiabiodiversityboard.org)

With a maximum length of 31 centimetres, it is a small snake. Its slim, thin body ends with a typical tail that has a pointy tip. The black spots are spaced evenly along the vertebral column, giving the upper body a brown colour. The colour of the side body is greyish and is distinguished from the colour of the upper body by a continuous pattern of black dots. The underside has a yellow-green colour with blackish spots on the ventral scales' outer border. The eyes are moderately big, and circular in the pupil, and the head is slightly wider than the neck. Up till the neck, the head is typically black, with a white ring at the end. A brownish collar or two unconnected spots on top of the neck are present.

Usually one anterior temporal scale, the loreal is small or frequently united with the posterior nasal or prefrontal scale, and its lower margin passes between the sixth and seventh supralabials. The parietal is in contact with both postoculars. This snake species has seven or eight supralabials, of which the third and fourth or third to fifth are in contact with the eyes. smooth dorsal scales with 17 rows in the mid-body.

Reported from states such as Bihar, Delhi, Haryana, Himachal Pradesh, Jammu, Odisha, Punjab, Uttar Pradesh, Uttarakhand, and West Bengal. It is also found in Pakistan, Bangladesh, and Nepal.

Cantor's Black-headed Snakes are known for being evasive and non-aggressive. When confronted with danger, they usually avoid confrontation and take a defensive stance. It can roam through a variety of landscapes with ease because this behaviour is in line with its survival instincts. The Cantor's Black-headed Snake reproduces by oviparous means. With the designation BMNH 60.3.19.12.68, the holotype was obtained from Bengal, Tirhoot. According to the IUCN Red List, the Cantor's Black-headed Snake is now classified as Least Concern (LC). For its conservation, it is imperative to keep an eye out for any dangers like pollution, habitat loss, and human encroachment.

The unique characteristics and adaptable behaviour of the Cantor's Black-headed Snake serve as a symbol of the diverse range of South Asian reptiles. To save this cryptic species and ensure its continued existence in the natural environment, conservation and scientific endeavours must continue.

Literature Cited:

1.   Bhattarai, S., Pokheral, C. P., Lamichhane, B. R., Regmi, U. R., Ram, A. K., Subedi, N. (2018). Amphibians and reptiles of Parsa National Park, Nepal. Amphibian & Reptile Conservation, 12(1), 35–48 (e155).

2.     Bhattarai, S., Gurung, A., Lamichhane, B. R., Regmi, R., Dhungana, M., Kumpakha, B., & Subedi, N. (2020). Amphibians and Reptiles of Chure Range, Nepal. President Chure Terai-Madhesh Conservation Development Board and National Trust for Nature Conservation, Khumaltar, Lalitpur, Nepal.

3.     Boulenger, G. A. (1893). Catalogue of the snakes in the British Museum (Nat. Hist.) I. London: Taylor & Francis. Boulenger, G. A. (1890). The Fauna of British India, Including Ceylon and Burma. Reptilia and Batrachia. Taylor & Francis, London, xviii, 541 pp.

4.     Cantor, T. (1839). Spicilegium serpentium indicorum [part 2]. Proc. Zool. Soc. London, 1839, 49-55.

5.   Captain, A., Gower, D. J., David, P., & Bauer, A. M. (2004). Taxonomic status of the colubrid snake Sibynophis subpunctatus (Dumeril, Bibron & Dumeril, 1854). Hamadryad, 28(1&2), 90-94.

6.  Das, I., & Palden, J. (2000). A herpetological collection from Bhutan, with new country records. Herpetological Review, 31(4), 256-258.

7.  Dutta, S. K., Nair, M. V., Mohapatra, P. P., & Mahapatra, A. K. (2009). Amphibians and reptiles of Similipal Biosphere Reserve. Regional Plant Resource Centre, Bhubaneswar, Orissa, India.

8.     Livraison. J.B. Bailière et Fils, Paris. Kästle, W., Rai, K., & Schleich, H. H. (2013). FIELD GUIDE to Amphibians and Reptiles of Nepal. ARCO-Nepal e.V., 625 pp.

9.     Kramer, E. (1977). Zur Schlangenfauna Nepals. Revue Suisse de Zoologie, 84(3), 721-761.

10. Mehra, G. S., Mohanty, N., & Dutta, S. K. (2022). Occurrence patterns of herpetofauna in different habitat types of western Terai Arc Landscape, India. Journal of Threatened Taxa, 14(5), 21010–21018.

11.  Murthy, T. S. N. (2010). The reptile fauna of India. B.R. Publishing, New Delhi, 332 pp. Pandey, D. P. (2018). New records of snakes from Chitwan National Park and vicinity, Central Nepal. Herpetology Notes, 11, 679-696.

12. Patel, H., & Vyas, R. (2019). Reptiles of Gujarat, India: Updated Checklist, Distribution, and Conservation Status. Herpetology Notes, 12, 765-777.

13. Rawat, Y. B., Bhattarai, S., Poudyal, L. P., & Subedi, N. (2020). Herpetofauna of Shuklaphanta National Park, Nepal. Journal of Threatened Taxa, 12(5), 15587–15611.

14. Sahi, D. N., & Koul, S. (2020). Annotated List of Amphibians and Reptiles of Jammu and Kashmir State. In: Dar G. & Khuroo A. (eds) Biodiversity of the Himalaya: Jammu and Kashmir State. Topics in Biodiversity and Conservation, vol 18.

15. Springer, Singapore. Saikia, U., Sharma, D. K., & Sharma, R. M. (2007). Checklist of the Reptilian fauna of Himachal Pradesh, India. Reptile Rap, 8, 6-9.

16.  Sharma, R. C. (2004). Handbook Indian Snakes. AKHIL BOOKS, New Delhi, 292 pp. Singh, J., Dutta, S. K., & Singh, H. (2021). Herpetofauna of Punjab: The Field Guide. New Era Book Agency, Chandigarh, 82 pp.