Coryphella verrucosa rufibranchialis from Maine, USA. April 2022. © CC-BY-NC J. Goddard.
C. v. rufibranchialis, or species or forms resembling it, are usually recorded as C. verrucosa, in North America.
C. v. verrucosa is confined to Shetland and Scandinavia where it is frequent and sympatric with C. v. rufibranchialis.