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Revision of the Hydroporus nigellus complex (Coleoptera: Dytiscidae) inciuding multivariate species separation

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The six species assigned to the Holarctic nigellus complex of Hydroporus Clairville are revised, and a key is given to the separation of males. Species limits were studied biometrically, chiefly using body length, penis length and male protarsal width. Principal components analysis was used to combine size variables taken from samples throughout species ranges. The two Holarctic species H. geniculatus Thomson, 1854, and H. nigellus Mannerheim, 1853, are separated on tarsal width, with H. nigellus being circumboreal and H. geniculatus confined to NW Europe and NW North America. Of the four other species H. semenowi Jakowlew, 1897, is Palearctic, and H. despectus Sharp, 1882, H. tartaricus LeConte, 1850, and H. tenebrosus LeConte, 1850, are Nearctic. Lectotypes are designated for the following nominal species: Hydrocoptus obscuripes Motschulsky, 1860, Hydroporus caminarius Motschulsky, 1860, Hydroporus despectus Sharp, 1882, Hydroporus eugeniae Zaitzev, 1909, Hydroporus lugubris Motschulsky, 1845, Hydroporus melancholicus Motschulsky, 1860, Hydroporus opacus Wehncke, 1871, Hydroporus pyrenaeus Wehncke, 1871, Hydroporus rusticus Sharp, 1882, Hydroporus semenowi Jakowlew, 1897, and Hydroporus tartaricus LeConte, 1850. The following new synonymies are established: Hydroporus longitarsis J. Sahlberg, 1910, and Hydroporus afflatus Scholz, 1917 = Hydroporus semenowi Jakowlew, 1897; Hydrocoptus obscuripes Motschulsky, 1860, Hydroporus pyrenaeus Wehncke, 1871, Hydroporus bungei Zaitzev, 1910, and Hydroporus tungus Zaitzev, 1910 = Hydroporus nigellus Mannerheim, 1853; Hydroporus eugeniae Zaitzev, 1909 = Hydroporus elongatulus Sturm, 1835.

Affiliations: 1: A. N. Nilsson, Department of Animal Ecology, University of Umea, S-901 87 Umea, Sweden


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