Oulimnius tuberculatus (Mueller, 1806)
Family: Elmidae
Size: 1.8 mm (1.7 to 1.9 mm)
Distribution: Europe
Ecology: Lives in rivers of the plane in moss of stones and on water crowfoot
Location: Germany, Bavaria, Upper Franconia, Selbitz, Weidesgruen, Selbitz river
leg. det. U.Schmidt, 10.VII.2002
Photo: U.Schmidt, 2015

 Oulimnius tuberculatus  (Flickr)