Data for: A taxonomic revision of ten whitefish species from lakes Lucerne, Sarnen, Sempach, and Zug, Switzerland, with descriptions of seven new species (Teleostei, Coregonidae)

<p><span>The taxonomy of the endemic whitefish of the lakes of the Reuss River system (Lucerne, Sarnen, Zug) and Lake Sempach, Switzerland, is reviewed and revised. Lake Lucerne harbours five species. <em>Coregonus</em> <em>intermundia</em> </span><span><strong>sp. nov.</strong> </span><span>and <em>C</em>. <em>suspensus</em> </span><strong><span>sp. nov.</span></strong><span>, are described. <em>Coregonus</em> <em>nobilis</em> Haack, 1882, <em>C</em>. <em>suidteri</em> Fatio, 1885, and <em>C</em>. <em>zugensis</em> Nüsslin, 1882, are redescribed. Genetic studies have shown that <em>C</em>. <em>suidteri</em> and <em>C</em>. <em>zugensis</em> are composed of several distinct species endemic to different lakes. The names <em>C</em>. <em>suidteri</em> and <em>C</em>. <em>zugensis</em> are restricted to the species of lakes Sempach and Zug, respectively. The whitefish populations previously referred to as <em>C</em>. <em>suidteri</em> and <em>C</em>. <em>zugensis</em> from Lake Lucerne are described as <em>C</em>. <em>litoralis</em> </span><span><strong>sp. nov.</strong> </span><span>and <em>C</em>. <em>muelleri</em> </span><strong><span>sp. nov.</span></strong><span>, respectively. Furthermore, the whitefish from Lake Zug that were previously referred to as <em>C</em>. <em>suidteri</em> are described as <em>C</em>. <em>supersum</em> </span><strong><span>sp. nov</span></strong><span><strong>.</strong> A holotype is designated for <em>C</em>. <em>supersum</em> that was previously one of two syntypes of <em>C</em>. <em>zugensis</em>. The other syntype is retained for <em>C</em>. <em>zugensis</em>. <em>Coregonus</em> <em>obliterus</em> </span><span><strong>sp. nov.</strong> </span><span>is described from Lake Zug, and <em>C</em>. <em>obliterus</em> and <em>C</em>. <em>zugensis</em> from Lake Zug are extinct. Finally, we describe <em>C</em>. <em>sarnensis</em> </span><span><strong>sp. nov.</strong> </span><span>from lakes Sarnen and Alpnach. <em>Coregonus</em> <em>suidteri</em> from Lake Sempach shows strong signals of introgression from deliberately translocated non-native whitefish species, which questions if the extant population still carries a genetic legacy from the original species and thus may need to be considered extinct. <em>Coregonus</em> <em>suspensus</em> is genetically partially of allochthonous origin, closely related to the radiation of Lake Constance. It is therefore compared to all known and described species of Lake Constance: <em>C</em>. <em>wartmanni</em> Bloch, 1784, <em>C</em>. <em>macrophthalmus</em> Nüsslin, 1882, <em>C</em>. <em>arenicolus</em> Kottelat,1997, and <em>C</em>. <em>gutturosus</em> Gmelin, 1818.</span></p>