无棘折尾虾（学名：Uroptychus anacaena）为劣柱虾科折尾虾属下的一个种。

Uroptychus anacaena is a species of chirostylid squat lobster first found in Taiwan. U. anacaena and U. anatonus are similar but can be distinguished from each other by the shape of their 4th sternite and the length of their antennal scale. Both species resemble U. maori and U. brucei, but lack a ventral subterminal spine on their first pereopod's ischium.