Ephydrolithus is a Neotropical genus of water scavenger beetle in the family Hydrophilidae represented by five described species known from Brazil.
The genus Ephydrolithus was described for the first time by Girón & Short in 2019.
It belongs in the subfamily Acidocerinae and contains three described species from Brazil (BahÃÂa, Minas Gerais).
Small beetles (1.8âÂÂ3.3 mm), yellowish-brown to dark brown in coloration, with relatively short maxillary palps. A complete diagnosis was presented by Girón and Short.
According to Girón and Short "All known species are exclusively associated with rock seepages".