Caecidotea communis (Say, 1818)
- GB IUCN status: Not applicable (non-native)
- GB rarity status: Naturalised
Caecidotea communis is introduced from North America and is only known from Bolam Lake in Northumberland, where it appears to occur at the exclusion of the typically ubiquitous Asellus aquaticus.
It generally occurs in clear water with a substrate of mud or fine gravel and large quantities of decaying leaves from trees and shrubs (Harding & Collis, 2006).