Perkins, P. D. New Neotropical and Nearctic Species of Water Beetles in the Genera Hydraena Kugelann and Ochthebius Leach, a Key to North American Genera and Subgenera of the Family, New Distribution Records, and a Synopsis of Ecology, Behavior and Morphology Related to Aquatic Life (Coleoptera: Hydraenidae). Zootaxa 2023, 5367, 1-86.