Epeorus (Caucasiron) bicolliculatus, larva: A habitus in dorsal view B habitus in ventral view C habitus in lateral view D head of male in dorsal view E head of female in dorsal view F middle leg in dorsal view G abdominal terga H abdominal terga VI–X (arrows point on postero-medial protuberances) I gills VII (in natural position from ventral view) J–L abdominal sterna II–VI.