MetanonychusMetanonychus is a genus of harvestman in the family Paranonychidae. There are eight described species in Metanonychus, found in the northwestern United States.SpeciesThese eight species belong to the genus Metanonychus:Metanonychus cascadus Briggs, 1971Metanonychus idahoensis Briggs, 1971Metanonychus mazamus Briggs, 1971Metanonychus mechanicus Derkarabetian and Hedin, 2019Metanonychus navarrus Briggs, 1971Metanonychus nigricans Briggs, 1971Metanonychus oregonus Briggs, 1971Metanonychus setulus Briggs, 1971