See image for index to numbers.

1. Acilius sulcatus L. = Acilius sulcatus (Linnaeus, 1758) (1^a: larva, dorsal view, 1^b: adult male, dorsal view, 1^c: adult female, dorsal view, 1^d: head of adult from dorsal, 1^e: mandible of adult, 1^f: maxilla of adult, 1^g: labium of adult)
2. [Acilius] canaliculatus Nicol. = Acilius canaliculatus (Nicolai, 1822) (2^a: adult male, dorsal view, 2^b: adult female, dorsal view)
3. Dytiscus latissimus L. = Dytiscus latissimus Linnaeus, 1758 (3^a: adult male, dorsal view, 3^b: adult female, dorsal view)
4. [Dytiscus] punctulatus F. = Dytiscus semisulcatus O.F.Müller, 1776 (4^a: adult male, dorsal view, 4^b: adult female, dorsal view, 4^c: hindcoxa appendages)
5. [Dytiscus] dimidiatus Bergst. = Dytiscus dimidiatus Bergsträsser, 1778 (5^a: adult male, dorsal view, 5^b: adult female, dorsal view)
6. [Dytiscus] marginalis L. = Dytiscus marginalis Linnaeus, 1758 (6^a: larva, dorsal view, 6^b: adult male, dorsal view, 6^c: adult female, dorsal view, 6^d: labrum of adult, 6^e: mandible of adult, 6^f: maxilla of adult, 6^g: labium of adult, 6^h: hindcoxa appendages of adult)