Larval description and chaetotaxic analysis of Dineutus sinuosipennis Laporte, 1840, with a key for the identification of larvae of the tribe Dineutini (Coleoptera, Gyrinidae)

Larval structures (instar I). 19–20 Cephalic capsule, dorsal view 21–26 Anterior margin of frontoclypeus, dorsal view 27–29 Stipes, lacinia and galea, dorsal view 30–31 Tracheal gills, dorsal view 19Macrogyrus (Andogyrus) seriatopunctatus (Régimbart, 1883) 20Macrogyrus (Macrogyrus) oblongus (Boisduval, 1835) 21 Gyretes sp. 22M. (A.) seriatopunctatus23M. (M.) oblongus24 Enhydrus sulcatus (Wiedemann, 1821) 25 Dineutus sinuosipennis Laporte, 1840 26 Dineutus sp. (specimen from Bayfield County, Wisconsin, USA) 27 Gyrinus monrosi Mouchamps, 1957 28M. (M.) oblongus29 D. sinuosipennis 30 E. sulcatus 31 D. sinuosipennis.