Revision of the Neotropical water scavenger beetle genus Hansen, 1999 (Coleoptera, Hydrophilidae, Acidocerinae).

The genus Hansen, 1999 is revised and redescribed. The genus is found to contain six species, including two that are here described as new: (Brazil, Guyana, Suriname) and (Suriname, French Guiana). Two species are found to be junior subjective synonyms of Hansen, 1999: García, 2000, and Hansen, 1999, The male of Hansen, 1999 is described for the first time. New records are provided for Hansen, 1999, Hansen, 1999, and . All species are described and illustrated in detail. Most species are confirmed as having a terrestrial way of life, with several species being found in rotten fruits, sap flows, and dead wood. Furthermore, we discuss ecological trends of the species given their collecting information.