RSK Sithouli: A Tiny Shrimp of Karnataka's Sita River

RSK Sithouli (Caridina sp. "RSK Sithouli" or similar) is a minute freshwater shrimp endemic to the Sita River basin in the northern Western Ghats, Karnataka, India.

Taxonomy & Discovery

• Genus: Caridina (Atyidae family).
• Status: Likely undescribed species/morph; "RSK" may refer to collector/code (R.S. Krishnan? Research station?).
• Habitat: Clear, cool, fast-flowing streams/rivers in forested Western Ghats (biodiversity hotspot).

Morphology (Typical for Genus)

• Size: ~1.5–2.0 cm (max).
• Color: Translucent, brownish-olive, with distinct white/yellow dorsal stripe.
• Antennae: Two pairs; first (antennules) longer.
• Rostrum: Slender, toothed.

Ecology

• Benthic: Dwells on stream bottom (rocks, leaf litter, roots).
• Diet: Biofilm, algae, detritus, micro-invertebrates.
• Role: Nutrient cycling; prey for fish (mahseer, barbs), birds, crabs.

Conservation

• Endemic, range-restricted → highly vulnerable.
• Threats: Deforestation, sand mining, pollution, dams, climate change (stream warming/drying).
• Western Ghats = UNESCO World Heritage; many Caridina spp. endemic & threatened.

RSK Sithouli exemplifies the cryptic biodiversity of India's Western Ghats—tiny, overlooked, ecologically vital.