Genus Helius Lepeletier & Serville, 1828

Megarhina Lepeletier and Serville, 1828: 585 (as genus). Type species, Limnobia longirostris Meigen, 1818 (monotypic). Helius Latreille et al., 1828: 655 (as genus). Type species, Limnobia longirostris Meigen, 1818 (autom.).

Leptorhina Stephens, 1829: 243 (as genus). Type species, Limnobia longirostris Meigen, 1818 (monotypic).

Rhamphidia Meigen, 1830: 281 (as genus). Type species, Limnobia longirostris Meigen, 1818 (designation: Westwood, 1840).