Dryocalamus nympha

Common Bridle Snake
Dryocalamus nympha
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Colubridae
Genus: Dryocalamus
Species: D. nympha
Binomial name
Dryocalamus nympha
(Daudin, 1803)

Common Bridle Snake (Dryocalamus nympha) is a species of snake found in southern India and Sri Lanka. The yellow mark on the back of the head suggests a bridal veil. Bridle snakes are so named because of the resemblance of their slim bodies to the reins or 'bridle' used to control horses.

Characteristics: A small snake with a glossy black or dark brown colouration. Its colouration may be accompanied by a series of irregular white or grey stripes. Its ventral area is creamy yellow. This snake has considerably large eyes with vertical pupils which are adaptations for its nocturnal lifestyle. It has a rounded snout and an oval shaped flat head.

Behaviour

A nocturnal snake which is very active and timid by nature. If cornered and provoked it will fiercely attack its challenger repeatedly. This snake has a tendency to enter human dwellings in search of prey. It is highly capable of climbing walls but has an equal tendency to fall off, often onto unsuspecting human occupants with catastrophic results. Feeds mainly on lizards but may consume frogs and other small fauna when the opportunity provides so. Very little known due to the paucity of specimens. It is assumed to be oviparous. Little known about its growth rate. The longest specimens seldom exceed 50 cm.

Non venomous

Identification

This snake has 13 rows of Costals throughout its body and elongated Loreal shields that touch the eyes. Rostral: Touches six shields. Frontal: Relatively small. Supraoculars: Broad and prominent, each shield is nearly as big as the Frontal.
Parietals: Prominent and each shield is twice as bit as the Frontal.
Prefrontals: The combined system is nearly as large as the Frontal.
Nasals: Entire with the nostril situated at the centre. (Rarely may be divided)
Internasals: Span the entire length of the anterior edge of the Prefrontals.
Loreals: Elongated and touch the eyes.
Preoculars: Absent
Postoculars: Divided into two shields.
Temporals: Small and divided into two shields.
Supralabials: Seven pairs (Rarely six or eight) of which the third and fourth pairs touch the eyes.
Mental: Stereotype in form.
Infralabials: Five pairs of which the fifth is the largest.
Sublinguals: Anterior pair larger than the Posterior pair.
Costals: Fall into 13 rows that run throughout the entire length of the body.
Ventrals: 200 to 243
Anal Shield: Divided
Subcaudals: 65 to 88, divided

Dentition: Maxillary: 9 to 10 Palatine: 8 to 9 Pterygoid: 20 to 21 Mandibular: 19 to 21 Distribution: Southern India and Sri Lanka

The range of this snake appears to extend from Jaffna in the north to Anuradhapura, and includes Trincomalee. This snake is rare throughout its range and has not been recorded in the central hills.

References

This article is issued from Wikipedia - version of the 1/19/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.