ZSI Current Affairs

Ptilomera nagalanda: New species of water strider found in Nagaland

Scientists from Zoological Survey of India (ZSI) have discovered new species of water strider named Ptilomera nagalanda Jehamalar and Chandra in Nagaland. It was found in river Intanki in Peren district of Nagaland.

This newly discovered species belongs to Ptilomera agriodes genus. It measures about 11.79 mm and has long slender legs. It has orange with black stripes on dorsal side and pale yellowish brown ventral part of body. The presence of black stripes on dorsal side differentiates this species from other known species of subgenus Ptilomera. It is only found in rocky, fast flowing streams and rivers that are not exposed to lot of sunlight. It has hair on middle legs that help insects resist strong current of streams.

Water striders

Water striders aregroup of insects adapted to life on surface of water, using surface tension to their advantage. Their presence serves as indicator water of water quality and also play important role in food chain in river ecosystem as they feed on mosquito larvae.

Water striders have three pairs of legs. The front legs are relatively shorter than mid and hind legs and used to catch and hold prey. They possess needle-like mouth parts that are used for sucking the juice of prey. There are nearly 100 species of water striders found in India across different water bodies such as open ocean, ponds, pools, lakes, rivers, streams etc.

With discovery of Ptilomera nagalanda, the number of species of water striders belonging to subgenus Ptilomera has increased to six in India. These includes Ptilomera agriodes found in peninsular India, Ptilomera laticaudata, northern and northeastern India, Ptilomera assamensis found in northeastern India, Pltilomera occidentalis from Uttarakhand and Ptilomera tigrina found in the Andaman islands.

Month: Categories: Environment Current Affairs 2018


Odorrana arunachalensis: New new frog species discovered in Arunachal Pradesh

Scientists from Zoological Survey of India (ZSI) have discovered new frog species in the fast flowing streams in Talle Valley Wildlife Sanctuary (WLS) in Lower Subansiri district of Arunachal Pradesh.

The new species has been named Odorrana arunachalensis after the state Arunachal Pradesh were it was found. It is one of the five frog species discovered in India in recent times and the 59th in the world.

Odorrana Arunachalensis

Odorrana Arunachalensis belong to genus Odorrana (commonly known as the odorous frog). Odorrana is a genus of true frogs (Ranidae) from East Asia and surrounding regions including India. There are over 50 species of frogs belonging to the genus Odorrana.

Odorrana Arunachalensis is medium-sized green frog adapted for life in torrential waters of Arunachal Pradesh. It dwells in moss and fern covered rocky section along hill streams in mixed wet tropical forest type

It has black band-like mark between the eyes which is its distinguishing character that separates it from all the other frog species of this genus.This new species is majorly sighted during the wet season from April to September. They are not seen in the dry seasons.

Talley Valley Wildlife Sanctuary

It is a wildlife sanctuary as well as a bio-diversity hotspot located in Arunachal Pradesh. It is situated at the altitude of 2400 metres with rivers like Pange, Sipu, Karing and Subansiri flowing through the Reserved Forest and Sanctuary.

It mainly comprises sub-tropical and alpine forests and has variety of flora and fauna, many of which are endangered. Talley is plateau with dense forest of silver fir trees, pine clad plateau of beautiful grandeur, and vast wasteland. It is home to highly endangered species like clouded leopard. Pleioblastus simone is a bamboo variety only found in Talley Valley.

Month: Categories: Environment Current Affairs 2018