It includes the genera Baciliometra (Esaki), with four species from tropical South America, Chaetometra (Hungerford) and Dolichocephalometra (Hungerford), two monotypic genera from the Marquesas Islands, and Hydrometra, of at least 80 species worldwide and all North American species. The final subfamily is Limnobatodinae, which is closely related to Hydrometrinae, although it has hairs only on its head, thorax, and base of the abdomen, and pronotum longer than the ante-ocular portion of its head.
It includes the genera Baciliometra (Esaki), with four species from tropical South America, Chaetometra (Hungerford) and Dolichocephalometra (Hungerford), two monotypic genera from the Marquesas Islands, and Hydrometra, of at least 80 species worldwide and all North American species. The final subfamily is Limnobatodinae, which is closely related to Hydrometrinae, although it has hairs only on its head, thorax, and base of the abdomen, and pronotum longer than the ante-ocular portion of its head.