Douglas Stenelmis Riffle Beetle (Stenelmis douglasensis), a Wisconsin Special Concern beetle, is found in large spring-fed lakes, river edges, and small streams with sandy bottoms, where they occupy shallow, clear, unpolluted water. They are often found on pieces of wood. Riffle beetles are scrapers belonging to the Elmidae family and are generally quite small. Unlike beetles in most other families, they reside underwater during every stage of life and breath using gills, which limits their range, as many species need highly oxygenated water.
