Contacyphon variabilis is a species of marsh beetle in the family Scirtidae. It is found in Europe and Northern Asia (excluding China).
Further reading
Book: Checklist of the Beetles of North and Central America and the West Indies. 1983. Arnett . Ross H. Jr.. Flora & Fauna Publications. Family 36: Helodidae, The Marsh Beetles. 978-0916846121.