Comparison of the mesoventral process in Hydrobius. A Large and acute process found in all northern European variants of H. fuscipes, here represented by a specimen of H. f. fuscipes B Small and blunt process characteristic of H. arcticus.

  Part of: Fossen EI, Ekrem T, Nilsson AN, Bergsten J (2016) Species delimitation in northern European water scavenger beetles of the genus Hydrobius (Coleoptera, Hydrophilidae). ZooKeys 564: 71-120.