Pentaster is a genus of sea stars in the family Oreasteridae. It is also known as the Blunt Arm Sea Star. Taxonomy List of species according to the World Register of Marine Species: Pentaster hybridus Döderlein, 1936 Pentaster obtusatus (Bory de St. Vincent, 1827) References Oreasteridae Taxa named by Ludwig Heinrich Philipp Döderlein