Gynandromorphy in Vela carli: Rare Spider Phenomenon Explained

Context

In a first for the freshwater crab family Gecarcinucidae, researchers have discovered specimens of the species Vela carli exhibiting gynandromorphy (dual-sex traits) in the Silent Valley National Park, Western Ghats.

About Gynandromorphy

• Definition: A rare biological condition in which an organism possesses both male and female physical characteristics.
• Mechanism: Unlike hermaphroditism (where an organism has both sets of reproductive organs but may look like one sex), a gynandromorph’s body is often split—one side or certain parts may be phenotypically male while others are female.
• Discovery: The study observed male reproductive structures alongside female features in the same individual. This is a rare occurrence in crustaceans and a global first for this specific family.

About Vela Carli

• Habitat: It is an endemic freshwater crab found exclusively in the forests and streams of the Central Western Ghats.
• Micro-habitat: Specifically found in tree holes, which serve as unique ecological niches in tropical rainforests.
• Taxonomy: Belongs to the family Gecarcinucidae, a diverse group of freshwater crabs found across Asia and the Indian subcontinent.

About Silent Valley National Park

• Location: Palakkad district, Kerala, within the Nilgiri Biosphere Reserve.
• Significance: Known for being one of the last undisturbed tracts of South Western Ghats mountain rain forests and tropical moist evergreen forests in India.
• River: The Kunthipuzha River flows through the entire length of the park.
• Flora/Fauna: Famous for the Lion-tailed Macaque (Endangered).

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