Meghalaya’s new cave-dwelling fish adapts to streams overground: study, Pg14

A new troglophile loach species, named Schistura densiclava, was discovered in a cave system in East Khasi Hills, Meghalaya.

• It is a bottom-dwelling fish adapted to underground (subterranean) and surface streams.
• Notably, unlike many cave-dwelling species, it retains pigmentation and eyesight.
• The discovery was made in Krem Mawjymbuin, where a conflict over a Shivalinga-like stone formation drew attention.
• The species is endemic to this particular cave system, as confirmed by genetic testing.

Detailed Insights:

• Species Adaptation:

  • Troglophile animals can thrive in both cave (subterranean) and surface (epigean) environments.
    • Schistura densiclava lives in cool, fast-flowing streams (~18°C) inside caves with low oxygen levels but can also survive in surface waters.
  • Morphological Features:
    • Body: Pale yellow-green with 14–20 faint black bars and a thick dorsal stripe.
      • Name origin: Densiclava = “thick stripe” in Latin.
    • Males: Slimmer with puffier cheeks and irregular markings.
    • Females: Sturdier, with more consistent patterns.
  • Taxonomic Placement:
    • Family: Nemacheilidae (stone loaches)
    • Genus: Schistura, widely distributed across Asia.
    • Found ~60 meters inside the cave, making it geographically and ecologically significant.
  • Scientific and Conservation Implications:
    • Genetic analysis confirms it as a new species, likely endemic to the Krem Mawjymbuin cave system.
    • Calls for protection of cave habitats, which are often biodiversity hotspots but under threat from tourism, mining, and human conflict.

• Troglophile: Species adapted to both cave and surface ecosystems.

• Endemism: A species restricted to a specific geographic location.

• Barbels: Sensory structures near the mouth used to detect food.

• Cave Biodiversity: Often includes unique, blind, or pigment-lacking species, adapted to dark and low-oxygen habitats.

Significance:

• Adds to India’s rich inventory of undiscovered cave biodiversity.
• Highlights Meghalaya’s ecological uniqueness and potential for biogeographic research.
• Emphasises the need for conservation of subterranean habitats, which are rarely protected despite hosting specialised endemic fauna.

Mains Mock Question:

Q. What are troglophile species? Examine the significance of recent zoological discoveries in Meghalaya’s cave systems for biodiversity research and conservation.