Cydnus Fabricius, 1803: 184. Type species by subsequent designation (Doyère, 1837: pl. 88): Cimex tristis Fabricius, 1775 (= Cimex aterrimus Forster, 1771).
Cydonus Hahn, 1834: 115. Unjustified emendation.
Brachypelta Amyot & Serville, 1843: 89 (syn. Dallas, 1851a: 121). Type species by monotypy: Cimex tristis Fabricius, 1775 (= Cimex aterrimus Forster, 1771).
Cydnopeltus Signoret, 1881d: 28 (syn. J.A. Lis, 1997b: 404). Type species by monotypy: Cydnopeltus horvathii Signoret, 1881, Oriental Region.
Orientocydnus J.A. Lis, 1994a: 102 (as subgenus of Cydnus; syn. J.A. Lis, 1997b: 404). Type species by original designation: Cydnus (Orientocydnus) borneensis J.A. Lis, 1994, Malaysia, New Guinea.