Micropsalis Burmeister, 1861 (Prioninae) is preoccupied by Micropsalis Meyer, 1859 (Crustacea). Thus, Apterocaulus Fairmaire, 1864, currently synonym of Micropsalis Burmeister, is reinstated. A historical review about Apterocaulus and Micropsalis Burmeister is added. Microcometes Villiers, 1959 (Disteniinae) is a junior homonym of Microcometes Cienkowsky, 1875 (Protozoa), and Villiersicometes is proposed to replace it.
Apterocaulus; Microcometes; Micropsalis; Villiersicometes