Description. Wahlberg (1850: 219).
Type specimens. The lectotype (male) and two paralectotypes (females) were designated by Grichanov (2006 b: 184).
Synonymy. Junior synonym of D. lepidus proposed by Kahanpää (2008) based on nematode infected specimens.
Material examined. 1 male: Finland, Kuusamo, Sohramonlampi, (73302: 36057), 7.VII. 2006, leg. J. Kahanpää, jka06-01579 (MCSN).
Type locality. “Habitat ad Quickjock, Lapponiae Lulensis. In palude profundiore infra alpem Snjerak d. 9–20 Jul. 1845 utrumque sexum inveni.” [Kvikkjokk, Norrbotten County (Sweden)] (Wahlberg 1850).
= Dolichopus picipes Haliday, 1851 : 157 [misidentification] not Meigen, 1824 (Verrall 1875: 31)
= Dolichopus lapponicus Becker, 1917
Description. Becker (1917: 141–142).
Type specimens. Becker (1917) solely indicated “ɗ &” in his description, without specifying the number of specimens the name was based upon. We herein designate the lectotype (1 male) and 4 paralectotypes (2 males and 2 females) from Becker's collection from the type locality (see below).
Synonymy. Dolichopus lapponicus was first synonymized with D. cruralis by Stackelberg (1930) and later Ringdahl (1949) listed D. lapponicus under several “ monströse Formen ” in his paper, where he was aware of the modifications that altered the appearance of male specimens. Kahanpää (2008) synonymized D. cruralis with D. lepidus based on nematode-infected specimens and proposed the new synonymy of D. lapponicus with D. lepidus. Based on the type material examined here, we confirm this synonymy.
Material examined. LECTOTYPE (here designated) male labelled: “Gellivara VII/ 59807.”; “ Type ”; “ Dolichopus / lapponicus / Type Beck. ɗ”; “Dol. cruralis v./ 930 Wahlb./ Stackelberg det. ”; “Zool. Mus./ Berlin” (Fig. 1 C). 2 males, 2 females (paralectotypes) “Gellivara VII/ 43495.”; “ Typus ”; “Zool. Mus./ Berlin”.
Type locality. “Aus Gellivara, Lappland” [Gällivare, Norrbotten County (Sweden)] (Becker 1917).
Remarks. Additional to the type locality, Becker mentioned: “... und aus Lautaret, Dauphiné [France]; meine Samml. ”. However, this specimen, also examined during this study, belongs to Dolichopus consimilis Wahlberg, 1850 and not to D. lapponicus, which has already been reported by previous authors (e.g., Parent 1938). Dolichopus consimilis has been synonymized very recently with Dolichopus picipes Meigen, 1824 by Kahanpää (2008), also based on nematode-infected specimens.
= Dolichopus uliginosulus Dyte, 1980
Description. Becker (1925: 165–166) (first description); Dyte (1980: 224) (replacement name).
Type specimens. The description was based on at least one male and one female specimen (see below); however, solely a male specimen was found in Becker’s collection. We herein designate the lectotype (1 male).
Remarks. Dolichopus uliginosulus is the replacement name of D. uliginosus Becker, 1925 (Becker 1925: 165), which is a junior homonym of D. uliginosus Van Duzee, 1923 (Van Duzee 1923: 69).
Synonymy. Junior synonym of D. lepidus proposed by Negrobov & Maslova (2004).
Material examined. LECTOTYPE (here designated) male labelled: “ uliginosus / Beck.”; “Seefeld [?]/ O. W. N./ 10.VII. 22 ” [partly written in Sütterlin, an old German script (H. Ulrich, pers. comm.)]; “ Dolichopus / lepidus Staeg. / Negrobov det. ”; “ Typus ”; 5 th label: “Zool. Mus./ Berlin” (Fig. 1 D). A separate vial contains the hypogygium of the specimen with the following indications: Dolichopus uliginosus Zool. Mus. Berlin. Although Becker (1925) mentioned at least a male and a female specimen in his description (expressed by symbols of both sexes in his paper), we found only the here reported male lectotype specimen.
Type locality. The type locality is interpreted as “Seefeld” in Germany (former Ostpreußen), where the study of O. Harnisch – Becker's description is integrated therein – about the ecology of the peat bog landscape was conducted.