Trematocoris Mayr, 1865: 431. New name for Megatrema Mayr, 1865. Type species by subsequent designation (Hsiao, 1963c: 614, 621): Cimex tragus Fabricius, 1787.
Megatrema Mayr, 1865: 431 (junior homonym of Megatrema Leach, 1825, Cirripedia). Type species as for Trematocoris.