Hello

Ephemeroptera Recording Scheme (Mayflies), Plecoptera Recording Scheme (Stoneflies) and Trichoptera Recording Scheme (Caddisflies), through Biological Records Centre have produced 10KM range, recording and seasonal period rules for riverflies (mayflies, stoneflies and caddisflies). Additionally they have also assigned identification difficulties and highlighted species that require additional verification (species that are rare or new arrivals).  These are now available to download and use in the NBN Record Cleaner

Best wishes

Graham