Cantao Amyot & Serville, 1843: 29. Type species by monotypy: Cimex dispar Fabricius, 1794 (= Cimex ocellatus Thunberg, 1784).
Iostethus Stål, 1873a: 10 (as subgenus of Cantao; syn. McDonald, 1988: 287). Type species by subsequent designation (Kirkaldy, 1909a: xxxv): Calidea parentum A. White, 1839, Australia.