Fikáček, Martin, Franz Hebauer, and Michael Hansen. 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). Auckland, New Zealand:1–37. https://doi.org/10.11646/zootaxa.2054.1.1.