In News:

Researchers have discovered a new species of earthworm, Drawida vazhania, from the Vazhani Dam region of the Peechi–Vazhani Wildlife Sanctuary in Kerala’s Thrissur district, highlighting the rich and still unexplored biodiversity of the Western Ghats.

About Drawida vazhania

• It belongs to:
  • Genus: Drawida
  • Family: Moniligastridae
• Distribution of the Genus: The genus Drawida is naturally distributed across South, Southeast, and East Asia, indicating its biogeographical significance.

Key Morphological Features

• Small body size, classified under the Barwelli species group.
• Distinct characteristics that differentiate it from related species include:
  • Grooved male genital field
  • Kidney/bean-shaped prostate gland
  • Narrow, tubular C-shaped prostatic capsule
  • Small sessile atrium on the body wall

These unique anatomical features played a crucial role in identifying it as a new species.

Biodiversity Significance

• With this discovery:
  • Total Drawida species in India: 83
  • Total Drawida species in the Western Ghats: 55

Importance

• Highlights the Western Ghats as a global biodiversity hotspot.
• Demonstrates that even less conspicuous organisms like earthworms remain underexplored.
• Reinforces the role of soil biodiversity in maintaining ecosystem health.

Ecological Importance of Earthworms

• Known as “ecosystem engineers” due to their role in:
  • Soil aeration and nutrient cycling
  • Decomposition of organic matter
  • Enhancing soil fertility and agricultural productivity

Their diversity reflects the health of terrestrial ecosystems.