Gynandromorphy in Crab: Rare Freshwater Crab Found in Silent Valley for UPSC GS-3

1. Context

A rare freshwater crab of the species Vela carli displaying both male and female biological traits was discovered in Silent Valley National Park by researchers working with the Zoological Survey of India.

2. What is Special About This Finding

1. The crab shows gynandromorphy — a rare condition where one organism has both male and female characteristics.
2. Observed features included male reproductive structures along with female traits (such as gonopores).
3. This is the first recorded case of gynandromorphy in the freshwater crab family Gecarcinucidae.
4. Significant for understanding crustacean development, genetics and biodiversity.

3. Silent Valley National Park

1. Located in the Nilgiri hills of the Western Ghats in Kerala (Palakkad district).
2. Part of the Nilgiri Biosphere Reserve.
3. Known for undisturbed tropical evergreen rainforest ecosystems.
4. Drained by the Kunthipuzha River (a tributary of Bharathapuzha).
5. Biodiversity hotspot with endemic species like lion-tailed macaque, Nilgiri langur and rare flora.