Researchers from four universities in West Bengal have been looking for fossils in the sediments of Chotanagpur plateau for almost a year
A team of scientists from West Bengal has discovered the first dragonfly fossil in India from Jharkhand’s Latehar district. The fossil is at least 2.5 million years old. A paper on the finding was published in the October 10 edition of Current Science journal.
“This is the first dragonfly fossil from India. It is a well-preserved one. The fossil belongs to the late Neogene period, which dates between 2.5 million and five million years ago,” said Subir Bera, a professor with the Centre for Advanced Study of the Botany department, University of Calcutta.
The dragonfly is around 3cm long and has a wingspan of around 2.5cm. This is, however, much smaller than the fossils of giant dragonflies, which have been found elsewhere in the world. Experts said that the wingspan of one of the giant dragonflies Meganeuropsis permiana measured around 2.5 feet. It dates back to the Permian era, around 300 million years ago. In 2013, a giant, well-preserved dragonfly fossil, dating back 200 million years, was discovered in China.
Researchers from four universities in West Bengal have been looking for fossils in the sediments of Chotanagpur plateau for almost a year. In January 2020, they dug the dragonfly fossil from a depth of around 5m below the soil surface.The team has also found fossils of various insects, fishes and leaves of some flowering plants.
The research was headed by Mahasin Ali Khan, assistant professor of Botany at Sidho-Kanho-Birsha University.
“The nearest living member of the fossil is Libellula depressa, a species of dragonfly that is found in any tropical country, including India,” said Manoshi Hazra, one of the team members and the first author of the research paper, which has been published in Current Science.
As dragonflies spend most of their lives near fresh water bodies, the scientists said that millions of years ago a freshwater body might have existed there, which has now dried up. The other fossils of plants and fishes, which the scientists have found, also support the theory.
“The very fact that the team has found the fossil of an adult dragonfly from the sedimentary bed is very interesting. Usually the prospect of finding an immature dragonfly from the sedimentary bed is huge because dragonfly-larvae live underwater. The prospect of finding insect fossils from sedimentary beds and coal beds is huge, but unfortunately little work has been done in India in this regard,” said TK Pal, a former scientist of the Zoological Survey of India.
source: http://www.hindustantimes.com / Hindustan Times / Home> Kolkata / by Joydeep Thakur / Hindustan Times, Kolkata / October 08th, 2020