This species range extends from Labrador, Canada to North Carolina, USA (Cobb and Castro 2006). Van der Meeren et al. (2006) also note that it has been found in Iceland during the 1960s and more recently in Norway (2005). The Icelandic presence was not genetically verified, and it is believed that the waters are too limnic for this species to survive (van der Meeren et al. 2006). The Norwegian specimens are thought to have been introduced by imports of the species (van der Meeren et al. 2006).