Diplonychus Laporte, 1833: 18. Type species by monotypy: Nepa rustica Fabricius, 1781 (see note under Diplonychus rusticus).
Sphaerodema Laporte, 1833: 18 (as subgenus of Diplonychus; syn. Burmeister, 1835: 194). Type species by monotypy: Sphaerodema rotundatus Laporte, 1833 (= Nepa annulata Fabricius, 1781).
Atomya Spinola, 1850: 48 (syn. Spinola, 1850: 108). Type species by subsequent designation (Štys & Jansson, 1988: 6): Diplonychus (Sphaerodema) rotundatus Laporte, 1833 (= Nepa annulata Fabricius, 1781).
Cyclodema Dufour, 1863: 397. Suggested new name for Sphaerodema Laporte.
Nervinops Dufour, 1863: 398 (syn. Kirkaldy, 1906a: 151). Type species by monotypy: Nepa rustica Fabricius, 1781 (see note under Diplonychus rusticus).
Nectocoris Mayr, 1871: 432 (syn. Lauck & Menke, 1961: 649). Type species by monotypy: Nectocoris stali Mayr, 1871, Thailand.