On the taxonomy of water mites (Acari: Hydrachnidia) described from the Palaearctic, part 1: Hydrachnidae, Limnocharidae and Eylaidae Davids, Kees Sabatino, Antonio Di Gerecke, Reinhard Gledhill, Terence Smit, Harry Zootaxa 2005 1061 36 64 Koenike, 1895 Koenike 1895 [264,693,1548,1574] Arachnida Hydrachnidae Hydrachna Animalia Trombidiformes 4 39 Arthropoda species conjecta  Material examined: "  Hydrachna distincta" NHUBfemale "Ostfriesland, Sandwater bei Simoniswalde, 22.7.1910Leege" (err., non  H. distinctaKoenike); NHMLfemale "Lincolnshire, Dr. C.F. George Coll. [slide] 1926­VI­24.160 Balsam: 1898" (err., non  H. distinctaKoenike). Discussion: The specimen from the collection of Koenike is desiccated and mounted with the gnathosoma in situ, but there is sufficient evidence that it agrees well with  H. conjecta. An area posterior to the genital field bears very distinct papillae that could have been confused with acetabula, suggesting the presence of an elongated genital field as is characteristic for  H. distincta. The Lincolnshire specimen is mounted with the gnathosoma in situ. Probably it was attributed to  H. distinctadue to the equally rounded medial margin of the frontal sclerites, a character which is found to be variable when larger numbers of  H. conjectaare studied. In view of the enlarged genital field, the attribution of both specimens to  H. distinctais surely erroneous, they belong to  H. conjecta(see below).