Cercyon roseni
Knisch, 1922
Cercyon roseni is a small water scavenger beetle in the Hydrophilidae, first described by Knisch in 1922. It belongs to the Cercyon, a diverse group of beetles commonly found in moist or aquatic environments. The is documented across much of North America, with records spanning from Canada to the United States.
Pronunciation
How to pronounce Cercyon roseni: /ˈsɛr.si.ɒn ˈroʊ.se.ni/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Members of Cercyon are small, oval-shaped beetles typically measuring 2-5 mm in length. They are characterized by short, clubbed with a distinct 3-segmented club, and a pronotum that is often margined or with distinct lateral edges. Identification to level within Cercyon requires examination of male genitalia and other fine morphological details not readily visible in field observations.
Habitat
in the Cercyon are typically found in moist microhabitats including decaying organic matter, , compost, and the margins of ponds and streams. They are often associated with environments rich in decomposing plant material.
Distribution
Cercyon roseni is recorded from Canada (Alberta, British Columbia, Manitoba, New Brunswick, Northwest Territories, Nova Scotia, Ontario, Quebec) and the United States (California, Connecticut, Illinois, Indiana, Maine, Massachusetts, Michigan, Minnesota, Missouri, New Hampshire, New Jersey, Nevada, New York, Ohio, Pennsylvania, Rhode Island, South Dakota, Wisconsin).
Ecological Role
As a water scavenger beetle, Cercyon roseni likely contributes to nutrient cycling by feeding on decaying organic matter and microorganisms in moist .
Similar Taxa
- Cercyon unipunctatusSimilar small size and preferences; distinguished by specific elytral markings and male genitalia structure.
- Cercyon analisOverlapping distribution and ; requires detailed examination of pronotal and elytral sculpturing for separation.
More Details
Taxonomic Note
Catalogue of Life lists Cercyon roseni as a synonym, though GBIF and NCBI recognize it as an accepted . This discrepancy suggests ongoing taxonomic evaluation.
Collection Records
The is represented by only one observation in iNaturalist as of the available data, indicating it may be underreported or genuinely uncommon in citizen science datasets.