ThromidiaThromidia is a genus of starfish in the family Mithrodiidae.Description and characteristicsThese are unusually massive sea stars with five sausage-shaped arms, containing probably the heaviest species of Asteroidea, up to 6 kg.SpeciesThere are four recognized species according to World Register of Marine Species:Thromidia brycei Marsh, 2009 – Western AustraliaThromidia catalai Pope & Rowe, 1977 – West PacificThromidia gigas – South-west Indian oceanThromidia seychellesensis Pope & Rowe, 1977 – Seychelles