Indochinese spitting cobra
| Indochinese spitting cobra | |
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | Squamata |
| Suborder: | Serpentes |
| Family: | Elapidae |
| Genus: | Naja |
| Species: | N. siamensis
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| Binomial name | |
| Naja siamensis Laurenti, 1768
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| Naja siamensis distribution | |
The Indochinese spitting cobra (Naja siamensis) (Thai: งูเห่า, pronounced: nguu hao) also called the Thai spitting cobra, black and white spitting cobra, Siamese spitting cobra, is a species of spitting cobra found in Southeast Asia.
Description
This is a medium-sized elapid, with a more slender build compared to most other cobras within the genus Naja. The body colour of this species is variable from grey to brown to black, with white spots or stripes. The white patterning can be so prolific that it covers the majority of the snake. The highly distinctive black and white colour phase is common in central Thailand, specimens from western Thailand are mostly black, whereas individuals from elsewhere are usually brown. The hood mark can be spectacle-shaped, irregular or missing altogether, especially in adults.[3] Adults average between 0.9 to 1.2 metres (3.0 to 3.9 ft) in length,[4] and can potentially reach lengths of 1.6 metres (5 ft), although this is considered rare.[5] Body mass for adults can be tends to be around 1,600 grams.[6]
This species should not be confused with the monocled cobra (Naja kaouthia), which has similar habitat, size and appearance. Another distinguishing feature is that this species is a "true spitter"; it readily spits venom, but rather than a stream of venom as seen with many other "spitting cobras", this species ejects a "mist" rather than a "stream". Further, the reported spitting range of this species is approximately 1 metre (3.3 ft), which is the lowest range of any of the spitting cobras. Although Wüster (unpublished) reports that N. siamensis readily spits and may have a longer range, closer to 2 metres (6.6 ft), which comes out in a stream.[7]
Scalation
There are 25-31 scale rows around the hood, 19-21 just ahead of midbody; 153-174 ventral scales, 45-54 subcaudal scales, and basal pairs are sometimes undivided.[8]
Taxonomy
| Naja |
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Naja siamensis is classified under the genus Naja of the family Elapidae. It was first described by Austrian-born Italian zoologist Josephus Nicolaus Laurenti in 1768. The generic name Naja is a Latinisation of the Sanskrit word nāgá (नाग), meaning "cobra". The specific epithet siamensis is derived from the word Siam or Siamese, which means "relating to or characteristic of Thailand or its people and language".[9] This species was long confused with the monocled cobra (Naja kaouthia) and the Chinese cobra (Naja atra), and extensive variation in pattern and scalation contributed to this confusion. Detailed morphological and molecular analyses revealed it to be a distinct species during the 1990s.[3][10]
Distribution and habitat
It is found in Southeast Asia, including Thailand, Cambodia, Vietnam, and Laos. May occur in eastern Myanmar but no records are known.[3] It has been reported from Taiwan where it was released to the wild based on folklore Buddhist practices.[11] It occupies a range of habitats including lowlands, hills, plains, and woodland.[5] It can also be found in jungle habitat and it is sometimes attracted to human settlements because of the abundant populations of rodents in and around these areas.[12]
Behavior and diet
It is a primarily
Reproduction
The snake is
Venom
Like most other
If the snake spits venom into the eyes of an individual, the individual will experience immediate and severe pain as well as temporary and sometimes even permanent blindness.[3][13]
Cases
In a national hospital based survey of snakes responsible for bites in Thailand, 10% of all dead snakes brought by snake-bitten patients were of this species (described as "Naja atra northern spitting cobra"). Neurotoxic signs (ptosis and difficulty in breathing) were observed in 12 of the 114 cases (10.5%). Local swelling and necrosis were common, but many of the patients were followed up for too short a time to allow precise assessment of the incidence of these effects. Swelling and necrosis, comparable in all respects with that following bites by N. kaouthia, in patients envenomed by N. siamensis in Ubon and Kanchanaburi in Thailand.
References
- . Retrieved 20 November 2021.
- ^ "Appendices | CITES". cites.org. Retrieved 2022-01-14.
- ^ doi:10.1111/j.1469-7998.1997.tb01975.x. Archived from the original(PDF) on 2016-12-20. Retrieved 2016-12-13.
- ^ ISBN 0-691-12436-1.
- ^ a b c "Naja siamensis - General Details, Taxonomy and Biology, Venom, Clinical Effects, Treatment, First Aid, Antivenoms". WCH Clinical Toxinology Resource. University of Adelaide. Retrieved 14 January 2012.
- ^ "Black And White Spitting Cobra". Encyclopedia of Life. Smithsonian. Retrieved 8 June 2021.
- ^ Wüster, W; Slowinski, J (2000). "A new cobra (Elapidae: Naja) from Myanmar (Burma)" (PDF). Herpetologica. 56 (2): 257–270. Retrieved 8 June 2021.
- ^ "Naja siamensis - Indochinese spitting cobra". Asiatic Naja. Bangor University. Retrieved 5 November 2013.
- ^ "Siamese". Synonoms. Retrieved 8 June 2021.
- S2CID 58939700.
- ^ News, Taiwan (2021-11-22). "Taiwan hiker bitten by Thai spitting cobra | Taiwan News | 2021-11-22 17:39:00". Taiwan News. Retrieved 2022-01-10.
{{cite web}}:|last=has generic name (help) - ^ a b c "Naja siamensis". Armed Forces Pest Management Board. United States Department of Defense. Archived from the original on 11 January 2012. Retrieved 14 January 2012.
- ^ ISBN 0-613-53093-4.
- .
- ISBN 0080122094. Retrieved 8 June 2021.
- ^ Chanhome, L., Cox, M. J., Vasaruchaponga, T., Chaiyabutra, N. Sitprija, V. (2011). Characterization of venomous snakes of Thailand. Asian Biomedicine 5 (3): 311–328.