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Macronychus quadrituberculatus Mueller, 1806
Family: Elmidae
Size: 3,0 mm (2,8 to 3,3 mm)
Distribution: Europe
Ecology: lives on  submerged wood in river rapids
Location: Germany, Upper Bavaria, Muenchen, Ampermoching, Amper river
leg. A.Skale, 28.VIII.2001; U.Schmidt, 2001
Photo: U.Schmidt, 2015

Macronychus quadrituberculatus   (Flickr)