Why in News?
Two new species of hoverflies, Eristalinus sapphirinus and Eristalinus brunettii, have entered the news following a historic discovery by scientists from the Zoological Survey of India (ZSI) in the Gangetic Plains of West Bengal.
About
- Century-Old Gap Filled: This discovery marks the first major addition to India's known Eristalinus hoverfly fauna in over 100 years, with the last major update recorded back in 1923.
- Everyday Biodiversity: The findings, published in the European Journal of Taxonomy, prove that highly human-modified areas like the Gangetic Plains still house undocumented life forms.
- Innovative Tracking: Because many hoverflies look nearly identical, the team successfully combined traditional physical analysis with advanced mitochondrial DNA barcoding to confirm the unique species.
Identification & Naming
- Eristalinus sapphirinus: Named for its distinct, striking metallic sapphire-blue coloration.
- Eristalinus brunettii: Named to honour Enrico Adelelmo Brunetti, a famous entomologist who historically studied Indian flies.
- The Research Team: Spearheaded by researchers Bristi Roy, Oishik Kar, and Jayita Sengupta from ZSI Kolkata.
Habitat & Discovery Location
- Location: Found across multiple districts in the Gangetic Plains of West Bengal, India.
- Environment Type: Discovered outside protected nature reserves, thriving directly within human-modified agricultural and everyday landscapes.
Dual Ecological Roles
- Adult Stage: Act as vital pollinators for both wild flora and cultivated agricultural crops.
- Larval Stage: Known as "rat-tailed maggots," they live in aquatic environments where they decompose organic waste and recycle critical nutrients.
General Hoverfly Facts
- The Illusion: Hoverflies (family Syrphidae) mimic bees and wasps with black-and-yellow markings to scare away predators, but they are entirely harmless and do not possess stingers.
- How to Spot Them: They have a single pair of wings (bees have two pairs), very short antennae, large bulbous eyes, and a signature flight style where they hover in place before darting quickly.
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