Thromidia gigas is a species of starfish in the family Mithrodiidae.

It was described by Ole Theodor Jensen Mortensen in 1935.

[1] It lives in the Indian Ocean off the coast of eastern South Africa and southern Madagascar.

[1][2] This species is probably the largest echinoderm in terms of bulk, and may exceed 13 pounds (5.9 kg).

This article about a starfish is a stub.