Checklist of all amphipods (class Crustacea, order Amphipoda) hitherto known from Switzerland, as well as tentative year of arrival for the non-native species.

1 Ketmaier & De Matthaeis 2010 show that the continental European population is an undescribed but different species from the nominal species described from Cyprus, and will likely be given a different name. Ruffo et al. 2014 described it under the name “Cryptorchestia garbinii” as a new species based on specimens collected near lake Garda. For reasons of consistency and continuity, and with taxonomic work still ongoing, we use the name Orchestia cavimana ( = Cryptorchestia cavimana after Ruffo et al. 2014), but point out that the specimen reported might fall under what is now described as Cryptorchestia garbinii.2 Probably comprises more than one species. Molecular analyses are needed to clarify taxonomic structure of the complex.3 Populations in the type locality (Lake Geneva) possibly extinct.4 A complex of at least six species (Lefébure et al. 2007), of which three are found in Switzerland.5 A species closely related to N. fontanus, molecular analyses needed to clarify taxonomic structure of the complex.6 Species complex with three morphologically similar species (Lefébure et al. 2006), of which one is found in Switzerland.7 G. fossarum is a species complex with at least three species in Switzerland, called until formal description type A, B and C (Westram et al. 2011, 2013, Müller 1998, Weiss et al. 2013).8 Karaman & Pinkster 1977 report it from the Jura mountains, and show a range-map extending into the Swiss Jura, but no specimens could be retrieved. Based on the species' distribution it is likely to occur in Switzerland (if it is not part of the G. fossarum complex) and its locality has been estimated from the map.9 This species has likely been replaced by D. villosus and transient populations were found in Switzerland only for a few years.Checklist of all amphipods (class Crustacea, order Amphipoda) hitherto known from Switzerland, as well as tentative year of arrival for the non-native species.