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The genus  Pseudocalanus  (Copepoda, Calanoida) consists of seven species, all of which are known to co-occur with two or more sibling species in some areas of their geographic ranges. Despite the ecological importance of this abundant genus, there is no available method that can reliably and accurately identify  Pseudocalanus  species without knowledge of origin. We present evidence of several observations of  Pseudocalanus moultoni  [ Frost (1989)  Can. J. Zool., 67, 525–551] in fjords of Svalbard and northern Norway; this species has previously been known to occur only on the east and west coasts of North America. Patterns of DNA sequence variation of the mitochondrial cytochrome oxidase subunit I (COI) gene allow us to confidently identify the species, discriminate it from co-occurring sibling species and infer relationships among the newly discovered and previously sampled  P. moultoni  populations. Our observations suggest that NE Atlantic populations of  P. moultoni  are self-sustaining and we discuss potential source populations and pathways of transport. In light of recent reports of climate-driven shifts in distributional ranges of marine zooplankton, accurate species identification is essential for monitoring and understanding marine ecosystems.

Discovery of Pseudocalanus moultoni ( Frost, 1989 ) in Northeast Atlantic waters based on mitochondrial COI sequence variation