Pie chart showing percentage of infection summary of the higher-level classification of endoparasite diversity among Palearctic subterranean rodents derived from a survey of published records from 1927 through 2022. Protozoa constitute the greatest diversity of endoparasites accounting for 39% of the total parasite species recovered followed by Nemata (30%), Cestoda (27%), Acanthocephala (3%), and the Trematoda coming in at only 1%.