Oreodytes sanmarkii is a species of predaceous diving beetle in the family Dytiscidae. It has a holarctic distribution, found in aquatic habitats in Europe, northern Asia (excluding China), and North America. It has an affinity toward low-velocity currents and pebbly microhabitat substrates. It was described by Finnish entomologist Carl Reinhold Sahlberg in 1826.
Subspecies There are two named subspecies of Oreodytes: Oreodytes sanmarkii alienus (Sharp, 1873) Oreodytes sanmarkii sanmarkii (C. R. Sahlberg, 1826)
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