Thiruvananthapuram
The Hindu, November 17, 2016
The Hindu, November 17, 2016
Reinforcing the importance of the Western Ghats as a
valuable reservoir of amphibian diversity, researchers from the
University of Delhi have reported two new species of leaping frogs from
Kerala and Karnataka.
The new species -
Indirana paramakri
and
Indirana bhadrai
- have been reported in the latest issue of PLOS One, an open access
scientific journal published by the Public Library of Science.
The
authors, Sonali Garg and S.D. Biju, conducted DNA barcoding of over 200
samples to provide new estimates of the species diversity and
distribution of Indirana frogs, an ancient genus endemic to the Western
Ghats biodiversity hotspot.
The specimens of
Indirana paramakri
were collected from wet rocks near streams and under leaf litter in
disturbed forest areas in Settukunu and Sugandhagiri, north of the
Palakkad Gap in Wayanad district.
The species epithet
is derived from the Malayalam words ‘para’ meaning rock and ‘makri’ for
frog, referring to the occurrence of the species on rocky terrain.
Reddish brown with a black band extending from the nostril to the sides,
the species is distinguished by its small snout- vent size and unique
toe webbing.
Named after its habitat,
Indirana bhadrai
is currently known only from the Muthodi forest in the Bhadra Wildlife
Sanctuary, located north of the Palakkad Gap in Karnataka. The frogs
were found on leaf litter in a secondary forest.
Distinguished by a pointed snout and toe webbing,
I. bhadra
is light brown with irregular dark brown blotches along the dorsal skin folds and a dark greyish-brown band between the eyes.
According
to Dr. Biju, though several studies have been carried out on the
Indirana genus, taxonomic ambiguities have remained an impediment for
proper identification of species and estimates of diversity and
distribution. “Our study provides new distribution records for all the
currently known Indirana species.”
The researchers
have outlined a distribution trend suggesting genetic isolation between
populations of the amphibians found north and south of the Palakad Gap,
indicating the role of elevational discontinuities in distribution. They
have proposed a reassessment of the IUCN categorisation of all species
for effective conservation of these relic frogs.