Echinaster luzonicus, the Luzon sea star,[2] is a species of starfish in the family Echinasteridae,[1] found in shallow parts of the western Indo-Pacific region.

It sometimes lives symbiotically with a copepod or a comb jelly, and is prone to shed its arms, which then regenerate into new individuals.

[5] A species of copepod, lives symbiotically on the oral (under) surface of Echinaster luzonicus; it is so cryptically coloured as to be almost indistinguishable from its host.

[6] Another associate of this starfish is the comb jelly, Coeloplana astericola, which grows in abundance on its aboral (upper) surface.

[7] Three symbionts recorded on E. luzonicus was the ectoparasitic snail Melanella martinii (A. Adams in Sowerby, 1854), followed by the pontoniine shrimp Zenopontonia soror (Nobili, 1904) and the polychaete scaleworm Asterophilia carlae Hanley, 1989 in the waters of a volcanic island.