Thromidia gigas
Thromidia gigas is a species of starfish in the family Mithrodiidae. It was described by Ole Theodor Jensen Mortensen in 1935. It lives in the Indian Ocean off the coast of eastern South Africa and southern Madagascar. This species is probably the largest echinoderm in terms of bulk, and may exceed . References 

Mithrodiidae
Fauna of the Indian Ocean
Animals described in 1935
Taxa named by Ole Theodor Jensen Mortensen