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The
Himalayan Salamanders
Himalayan
newt is the sole representative of the order Caudata among the amphibian
fauna of the Indian subcontinent and is listed under the endangered
category of Schedule I of the Indian Wildlife (Protection) Act,
1972. The species is found at altitudes of 1500m - 2250m in cold
climates of the Eastern Himalayan region and has been reported to
exist in a range spreading out from eastern Nepal through the Eastern
Himalaya uptil Southeast Asia.
The
salamanders are dark in colouration,slow and sluggish and unlike
frogs and toads, do not produce prominent sounds. They moreover
remain active in their breeding pools for very short period between
April and early September.
Salamanders
are secretive in their habits. During the warm summer months from
April to September, they are known to inhabit cool mountain lakes
, temporary and perennial pool and streams. Over the cold winter
months from October to March, they hibernate under leaf litter,
decaying logs and in mud burrows beneath forests. They swim slowly
with undulatory motions of their tails, occasionally surfacing to
breathe. Water-bettles and bugs,frog tadpoles, insect larvae, earthworms,
snails and slugs comprise the principal diet of the animal. Salamanders
often shelter among bamboo stumps during the dry season,where they
feed on the termites and woodlice that infest rooting vegetation.
While
mostly dark in colour, the Tylototriton verrucosus has light brown
limbs and tail. It's toes and fingers and under surface of it's
tail are pale in colour. The body is cylindrical in shape and the
head ringed by a hard porous ridge, with short longitudinal ridges
along the vertex. The snout is short but larger in diameter than
the eye. The eyes are moderate in size but have large upper eyelids.
Large glandular tubercles occur in line along the body,terminating
at the tail. The tympanum is distinct. The nostrils which are located
close to the tip of the blunt snout but have a space between them,are
semi-circular and are closed by a small flap of skin.Palatine teeth
are present in line with the internal nostrils along two ridges,
which meet in front but widely diverge behind. The animal's body
is around three times the length of its head, having four short
stumpy limbs with 4 fingers and 5 toes, and a long tail resembling
that of the crocodile. Thus the animal is also known as the Crocodile
Salamander because of this overall resemblance.
The
salamanders do not show sexual dimorphism. Through most of the year
the males and females are difficult to distinguish apart. However,
during the breeding season, they change in appearance, making identification
easier. A highly distended belly distinguishes the females, while
the males expel milt when their abdomen is pressed hard.
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Egg of a salamander
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Full
grown salamander
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Courtesy
: Debjani Roy
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