Cercyon dux
Sharp, 1873
Cercyon dux is a small water scavenger beetle in the Hydrophilidae, first described by David Sharp in 1873. The has a native distribution in East Asia including Russia (Far East, Kuriles), Japan (Hokkaido, Honshu), the Ryukyu Islands (Okinawa), and southern Korea. It has been recorded as possibly introduced to western North America, with reports from British Columbia, Canada and Washington State, USA. As a member of the Cercyon, it belongs to a group of beetles commonly associated with moist organic matter and decaying vegetation.
Pronunciation
How to pronounce Cercyon dux: //ˈsɜr.si.ɒn ˈdʌks//
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Distribution
Native range: Russia (Far East, Kuriles), Japan (Hokkaido, Honshu), Ryukyu Islands (Okinawa), and southern Korea. Introduced or possibly introduced reported from Canada (British Columbia) and USA (Washington State).
More Details
Taxonomic Status Note
Catalogue of Life lists Cercyon dux as a synonym, while GBIF and NCBI treat it as an accepted . This discrepancy may reflect ongoing taxonomic revision in the Cercyon.
Observation Data
Only 4 observations recorded on iNaturalist as of the data cutoff, suggesting the is either genuinely rare, underreported, or identification-challenging.