Trimeresurus malabaricus
Encyclopedia
Common names: rock viper, Malabar rock pitviper.

Trimeresurus malabaricus is a venomous
Venomous snake
"Poisonous snake" redirects here. For true poisonous snakes, see Rhabdophis.Venomous snakes are snakes which have venom glands and specialized teeth for the injection of venom...

 pitviper
Crotalinae
The Crotalinae, commonly known as "pit vipers" or crotaline snakes, are a subfamily of venomous vipers found in Asia and the Americas. They are distinguished by the presence of a heat-sensing pit organ located between the eye and the nostril on either side of the head...

 species
Species
In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 found in southwestern India
India
India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

. No subspecies are currently recognized.

Description

Dorsal scale rows number 21 or 19 at mid body, weakly keeled. Ventral scales
Ventral scales
In snakes, the ventral scales are the enlarged and transversely elongated scales that extend down the underside of the body from the neck to the anal scale. When counting them, the first is the anteriormost ventral scale that contacts the paraventral row of dorsal scales on either side...

 in the males number 143-158 and females 136-159. Anal scale
Anal scale
In snakes, the anal scale is the scale just in front of and covering the cloacal opening. This scale can be either single or paired . When paired, the division is oblique. It is preceded by the ventral scales and followed by the subcaudal scales....

 entire. Subcaudals paired and numbering 50-63 in males, 44-54 in females. Internasals large and usually touching. There are 9 or 10 supralabials, the first completely separated from the nasal. There is a single row of scales between supralabials and elongate subocular. The temporal scales
Temporal scales
In reptiles, the temporal scales are those scales on the side of the head between the parietal scales and the supralabial scales, and behind the postocular scales.There are two types of temporal scales:...

 are smooth or obliquely keeled.

Geographic range

Found in southern and western India
India
India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

 at 600-2,000 m elevation. The type locality given is "all the forests of the West Coast ... S. India" (the Western Ghats
Western Ghats
The Western Ghats, Western Ghauts or the Sahyādri is a mountain range along the western side of India. It runs north to south along the western edge of the Deccan Plateau, and separates the plateau from a narrow coastal plain along the Arabian Sea. The Western Ghats block rainfall to the Deccan...

 of southwestern India
India
India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

.

Behavior

They are nocturnal and usually inactive in the day, sometimes seen basking on rocks or trees near streams.

Venom

Slow but capable of fast strikes. Venom causes moderate pain and swelling to humans and subsides in a day or two.
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