Hesperodiaptomus is a genus of copepods in the family Diaptomidae, containing 18 species. Two species – Hesperodiaptomus augustaensis and Hesperodiaptomus californiensis – are endemic to the United States and listed as vulnerable species on the IUCN Red List.

It is one of the most diverse genera of freshwater copepods in North and Central America, where its members live in alpine communities.

Species Hesperodiaptomus arcticus (Marsh, 1920) Hesperodiaptomus augustaensis (Turner, 1910) Hesperodiaptomus breweri M. S. Wilson, 1958 Hesperodiaptomus caducus Light, 1938 Hesperodiaptomus californiensis Scanlin & Reid, 1996 Hesperodiaptomus eiseni (Lilljeborg in Guerne & Richard, 1889) Hesperodiaptomus franciscanus (Lilljeborg in Guerne & Richard, 1889) Hesperodiaptomus hirsutus M. S. Wilson, 1953 Hesperodiaptomus kenai M. S. Wilson, 1953 Hesperodiaptomus kiseri (Kincaid, 1953) Hesperodiaptomus morelensis Granados-Ramírez & Suárez-Morales, 2003 Hesperodiaptomus nevadensis Light, 1938 Hesperodiaptomus novemdecimus M. S. Wilson, 1953 Hesperodiaptomus schefferi M. S. Wilson, 1953 Hesperodiaptomus shoshone (S. A. Forbes, 1893) Hesperodiaptomus victoriaensis (Reed, 1958) Hesperodiaptomus wardi (Pearse, 1905) Hesperodiaptomus wilsonae (Reed, 1958)

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