Monolistra is a genus of troglobiotic isopod crustaceans in the family Sphaeromatidae. Its members are distributed in the European continental karst groundwaters, restricted to countries of the former Yugoslavia, Italy and Switzerland. It contains the following subgenera and species, four of which are listed as vulnerable (VU) or endangered (EN) on the IUCN Red List:
Microclista is a monophyletic clade within the Monolistra genus, with a distribution limited to the area of the Dinaric alps . All species are found in fresh karst-groundwater.