Glabraster

Glabraster is a genus of starfish in the family Poraniidae. It is monotypic, the sole species being Glabraster antarctica. It is also known as the red spiny cushion star.

Glabraster antarctica is found in the Southern Ocean, southern Pacific Ocean, and southern Atlantic Ocean on rock, sand, and shell substrates from the intertidal zone down to a depth of . Although morphologically variable, genetic analyses do not support splitting this species into subspecies.