Interior-highlands
Guides
Lirceus
Flat Waterslaters
Lirceus is a genus of freshwater isopod crustaceans in the family Asellidae, commonly known as flat waterslaters. The genus contains at least 18 described species distributed across southern Canada and the eastern United States, extending westward to the Great Plains. Many species inhabit caves and springs, particularly in the Interior Highlands region (Ozark and Ouachita Mountains), while others occupy surface streams and leaf pack habitats. Two species are listed as endangered or vulnerable on the IUCN Red List.