Researchers discover 4 new species of parasitic wasps

Kolkata: Researchers from the Kolkata-headquartered Zoological Survey of India (ZSI) discovered four new species of microscopic parasitic wasps. These wasps, belonging to the genus Idris Förster (Hymenoptera: Scelionidae), were found in West Bengal and are primary egg parasitoids of jumping spiders (Salticidae). Uniquely, they exhibit gregarious parasitism, where multiple wasps develop within a single spider egg sac.The newly identified species—Idris bianor, Idris furvus, Idris hyllus, and Idris longiscapus—were collected between 2021 and 2023 from agroecosystems and semi-natural habitats across West Bengal. Their identification was achieved through a meticulous combination of detailed morphological examination and cutting-edge DNA barcoding. The discovery, led by senior scientist Ks Rajmohana and her research team, was recently published in the European Journal of Taxonomy. This study not only expands highlights the remarkable variety of parasitoid wasps in lesser-explored habitats."It represents a modern, integrative approach to understanding biodiversity," ZSI director Dhriti Banerjee said."Each new species discovery adds a critical piece to the puzzle of life's diversity. Understanding these hidden members of ecosystems can reveal essential insights into ecological processes, evolution, and biodiversity patterns," said K Rajmohana, scientist E at ZSI."An integrated taxonomic approach, which combines traditional morphological studies with modern molecular analysis, is crucial for species delimitation," explained K P Dinesh, Scientist E at ZSI, Pune, who provided the molecular expertise for the study.Co-author Rupam Debnath, a researcher on the team, commented on the global significance of the findings: "DNA sequences are currently available for only a small number of described Idris species globally. This makes our contribution particularly valuable in expanding the genetic reference library for the group."Parasitoid wasps like Idris play a crucial ecological role by regulating host populations, such as spiders, thereby helping to maintain the balance of arthropod communities. "Despite their minute size, parasitoids are powerful natural regulators," noted Sushama V, lead author and DST-Inspire Fellow.This latest research builds upon earlier findings by the team, first published in the open-access journal PLOS ONE, which documented the phenomenon of gregarious parasitism by Idris species from India.