Onisimus turgidus (Sars, 1879) (Amphipoda, Uristidae), an overlooked amphipod from sea anemones in Northern Norway

• Published in: European Journal of Taxonomy
• Main Authors: Wim Vader, Jan Roger Johnsen, Anne Helene S. Tandberg
• Format: Article in Journal/Newspaper
• Language: English
• Published: Consortium of European Natural History Museums 2020
• Subjects: sibling species; Crustacea; species complex; Zoology; QL1-991; Botany; QK1-989; Barents Sea; Norway; Northern Norway
• Online Access: https://doi.org/10.5852/ejt.2020.724.1155; https://doaj.org/article/2d58a9bd859d4f938de0169e1f3b8925

Two Norwegian uristid amphipods, obligate associates of sea anemones, have for a long time been confused sub nomine Onisimus normani Sars, 1890. In reality this species only occurs in south Norway, while the north-Norwegian material belongs to O. turgidus (Sars, 1879), described from the Barents Sea and for a long time forgotten. This paper fully illustrates both species, gives a key, and provides data on their distribution and ecology.