Fikáček, M., Hebauer, F. and Hansen, M. 2009. Taxonomic revision of New World species of the genus Oosternum Sharp (Coleoptera: Hydrophilidae: Sphaeridiinae) I. Definition of species groups and revision of the Oosternum aequinoctiale group. Zootaxa. 2054, 1 (Mar. 2009), 1–37. DOI:https://doi.org/10.11646/zootaxa.2054.1.1.