Three species of the amphipod genusSyrrhoeare described from the North Atlantic. The differences between these species are primarily the patterns of serration of the posterior margins of pleonite 3 and urosomite 1 and 2:Syrrhoeaffinishas a wide convex space on the posterior margin between the epimeron 3 and the dorsal serration. InSyrrhoecrenulataandSyrrhoeanneheleneaesp. nov.there is only a small notch on the posterior margin of pleonite 3.Syrrhoeanneheleneaesp. nov., otherwise similar toS.crenulata, has an additional serration on the posterior margin of urosomite 1. The inter- and intraspecific distances analyzed from COI confirm the morphological species concept of North AtlanticSyrrhoe.
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