The widely known and ecologically important sea star species, Luidia clathrata, was originally named Asterias clathrata by Say, 1825. This name is a junior homonym of Asterias clathrataPennant, 1777. The senior homonym has not been used as a valid name since 1899, fulfilling Article 23.9.1 of the Code, which reverses the priority of Asterias clathrataSay, 1825 over its senior homonym Asterias clathrataPennant, 1777. Here, in accordance with Article 23.9.2, we declare Asterias clathrataSay, 1825 a nomen protectum and Asterias clathrataPennant, 1777 a nomen oblitum.