Guwahati: A rare parasitic wasp belonging to a little-known insect group has been recorded from a tea estate in Assam, drawing attention to the rich but largely unexplored biodiversity that exists within tea plantations.
The finding comes from a taxonomic study by scientists from the Zoological Survey of India (ZSI), the Centre for Biodiversity Genomics at the University of Guelph in Canada, and the Kalinga Foundation, who reviewed the rare wasp subgenus Carinichelonus (family Braconidae) from India.
During the study, the team discovered a new species — Chelonus (Carinichelonus) mahadeb — from Nahortoli Tea Estate in Assam. They also documented Chelonus siangensis from Chubwa Tea Estate, extending its known distribution beyond Arunachal Pradesh, where it had previously been recorded.
Parasitic wasps of the genus Chelonus are tiny insects but play an important ecological role. They are known as egg–larval parasitoids, meaning they lay their eggs inside the eggs of other insects, usually moths and butterflies. The developing wasp larva eventually consumes the host, helping regulate insect populations naturally.
Because many moth larvae are major agricultural pests, species of Chelonus are often considered beneficial insects that contribute to natural pest control in crop ecosystems, including plantations.
Researchers say the discovery is notable because the subgenus Carinichelonus is extremely rare and poorly documented worldwide. Only a handful of species have been described from India, and records remain scattered.
The newly described species, Chelonus (Carinichelonus) mahadeb, has been named after Lord Mahadeb, the Hindu deity associated with creation and destruction.
“The discovery and documentation of species under the rare subgenus Carinichelonus adds important information to the understanding of parasitoid diversity in India,” the authors noted.
They added that the description of Chelonus (Carinichelonus) mahadeb from the Himalayan region represents a significant finding, as it is only the second new species of this subgenus described from India in recent times.
“This discovery not only expands the known biodiversity of the Braconidae family in the country but also highlights the potential for uncovering new insect taxa in underexplored biogeographical regions like the Eastern Himalayas,” the researchers said.
The presence of such parasitoid wasps in tea landscapes is particularly significant for agricultural ecosystems. Although tea plantations are cultivated landscapes, they often support a wide range of insects, spiders and other arthropods that form complex ecological networks.
Scientists say these natural enemies can help suppress pest populations without heavy reliance on chemical pesticides, making them valuable allies in sustainable agriculture.
Assam’s tea gardens, spread across vast areas of the Brahmaputra Valley, are increasingly being recognised as important habitats for biodiversity. Studies in recent years have documented diverse butterflies, birds, spiders and beneficial insects within tea estates.
However, insect groups such as parasitoid wasps remain poorly studied due to their small size and the specialised expertise required to identify them.
The latest discovery underscores the importance of continued biodiversity surveys in tea-growing landscapes. For scientists, such findings serve as a reminder that tea plantations can function not only as agricultural systems but also as reservoirs of hidden biodiversity.
With more systematic exploration, researchers believe many more unknown or rarely recorded insect species may still be waiting to be discovered within the tea ecosystems of Northeast India.
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