Japan-endemic-radiation
Guides
Actenicerus
Marsh Click Beetles
Actenicerus is a genus of click beetles (Elateridae: Dendrometrinae) comprising approximately 37 species distributed primarily across the Northern Hemisphere, with exceptional diversity in Japan where 26 species are endemic. The genus includes the well-documented Marsh Click-beetle (A. siaelandicus), a Palaearctic wetland specialist. Members exhibit the family's characteristic escape mechanism—producing an audible click to right themselves when overturned.