Why in news?
A research team working in Silent Valley National Park, part of the Nilgiri Biosphere Reserve in the Western Ghats, has discovered two previously unknown species of moniligastrid earthworms. The findings, published in the journal Zootaxa, highlight the region’s exceptional biodiversity.
Background
The Western Ghats are a global hotspot for soil fauna, especially primitive earthworms belonging to the family Moniligastridae. The newly discovered species are Moniligaster girishi and Drawida reynoldsi. The former was collected from tropical wet evergreen forests near Chembotti, while the latter was found in montane grasslands between Sispara and Anginda. Both species were named to honour scientists: P. Girish Kumar, noted for work on wasps, and John Warren Reynolds, a renowned earthworm taxonomist.
Key features
- Moniligaster girishi: Belongs to the gravelyi species‑group. It is distinguished by a single undivided spermathecal atrial gland on each side of the anterior body and by the structure of its prostate and prostatic capsule.
- Drawida reynoldsi: Belongs to the robusta species‑group. It has glandular prostates, bilobed spermathecal atria and a sausage‑shaped prostatic capsule. Its spermathecal atrium is large and erect compared with related species.
Significance of the discovery
- Biodiversity insights: With these additions, India’s moniligastrid fauna now comprises 95 recognised species, about 70 of which occur in the Western Ghats. Kerala alone hosts 43 per cent of Tamil Nadu’s moniligastrid species, underscoring the region’s richness.
- Conservation importance: The discoveries confirm Silent Valley as a biogeographical hotspot for soil fauna. Detailed surveys may reveal more species, emphasising the need to protect these unique habitats from deforestation and climate change.
- Potential applications: Researchers note that some countries are exploring the use of enzymes and proteins from earthworms in allopathic medicines. Understanding earthworm diversity could open avenues for bio‑prospecting and sustainable soil management.
Conclusion
The identification of M. girishi and D. reynoldsi enriches our knowledge of India’s soil biodiversity and reinforces the conservation value of the Silent Valley landscape. Continued taxonomic studies and habitat protection are crucial to uncover and preserve earthworm diversity in the Western Ghats.
Source: The Hindu
