Revision of Quedius sensu stricto (Coleoptera: Staphylinidae) Author Hansen, Aslak Kappel Natural History Museum of Denmark, Zoological Museum, Universitetsparken 15, 2100 Copenhagen, Denmark; e-mails: akhansen @ snm. ku. dk; asolodovnikov @ snm. ku. dk & Natural History Museum Aarhus, Wilhelm Meyers Allé 10, 8000 Aarhus, Denmark & Department of Bioscience, University of Aarhus, Ny Munkegade 116, 8000 Aarhus, Denmark Author Brunke, Adam Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa, Ontario, K Author Simonsen, Thomas Natural History Museum Aarhus, Wilhelm Meyers Allé 10, 8000 Aarhus, Denmark Author Solodovnikov, Alexey Natural History Museum of Denmark, Zoological Museum, Universitetsparken 15, 2100 Copenhagen, Denmark; e-mails: akhansen @ snm. ku. dk; asolodovnikov @ snm. ku. dk & Zoological Institute, Russian Academy of Science, Universitetskaja nab. text Acta Entomologica Musei Nationalis Pragae 2022 Acta. Ent. Mus. Natl. Pragae 2022-11-26 62 1 225 299 http://dx.doi.org/10.37520/aemnp.2022.017 journal article 217329 10.37520/aemnp.2022.017 795cf556-a4a9-477b-b55d-cb80ed8a0f2d 1804-6487 7399702 28D55112-98B1-49A5-B382-58B1B068570B Key to species and species groups of Quedius sensu stricto 1 Presence of 4 or 6 additional setiferous punctures between anterior frontal punctures ( Fig. K1A ). Palearctic, two species introduced to the Nearctic. Q. fuliginosus -group .................................................. 5 – Presence of 2 or no additional setiferous punctures between anterior frontal punctures ( Fig. K1B ). ..... 2 2 Presence of 2 additional setiferous punctures between anterior frontal punctures ( Fig. K2A ). Nearctic. Q. molochinoides -group ..................................... 15 – No additional setiferous punctures between anterior frontal punctures ( Fig. K2B ). ................................. 3 3 Additional 1 to 3 punctures in the posterior half of the sublateral row ( Fig. K3A ). W Palearctic. Q. pallipes - group ...................................................................... 8 – No additional puncture in the posterior half of the sublateral row ( Fig. K3B ). ..................................... 4 4 Palearctic. Q. molochinus -group .......................... 9 – Nearctic. Q. laticollis -group and Q. molochinus introduced from Palearctic. .................................. 19 5 Scutellum punctured and pubescent ( Fig. K5A ). W Palearctic, usually preferring warmer drier habitats. ................................. Quedius levicollis Brullé, 1832 – Scutellum unpunctured and glabrous ( Fig. K5B ). ......................................................................................6 6 Head with 4 additional punctures between posterior frontal punctures, but without additional puncture between anterior and posterior frontal punctures ( Fig. K6A ). Median lobe without apical ridge. Paleartic. Introduced to multiple Nearctic localities. ............. 7 – Presence of 4 additional punctures between posterior frontal punctures and one additional puncture on either side between anterior and posterior frontal punctures ( Fig. K6B ). Median lobe with apical ridge ( Fig. 14A ). Palearctic, known only from North Africa and the islands of Sardinia and Corse . ...................... .................. Quedius afrofuliginosus Gusarov, 1991 7 Basal three antennomeres at least slightly darkened. Eyes clearly protruding making the head seem more rectangular wider across ( Fig. K7A ). Apex of median lobe not laterally flattened ( Fig. 14D ). Palearctic. Introduced to E Canada . Prefers wetter humus rich habitats. Paleartic. Introduced to multiple Nearctic localities. ................................................................... ................. Quedius fuliginosus ( Gravenhorst, 1802 ) – Basal three antennomeres completely pale. Eyes not clearly protruding making the head seem round ( Fig. K7B ). Apex of median lobe laterally flattened ( Fig. 14C ). Paleartic. Introduced to multiple Nearctic localities. ..... Quedius curtipennis Bernhauer, 1908 8 Sides of median lobe apex folded with distinct tooth situated at lower part ( Fig. 15C ). Western Europe along Atlantic Coast from Denmark to Iberia and inland in Southern France and Iberian Peninsula, also on the islands of Madeira, Azores, Canaries, and Balearic ( Fig. K8A ). .................................................. ....................... Quedius hispanicus Bernhauer, 1898 – Sides of median lobe apex folded with distinct tooth situated at medial part ( Fig. 15D ). North Africa, Italy and islands of Sardinia and Corse ( Fig. K8B ). .......... ................................... Quedius pallipes Lucas, 1846 9 Elytra shortened, distinctly shorter than pronotum ( Fig. K9A ), obviously brachypterous species without whitish apical seam on abdominal tergite VII ( Fig. 11F ). East Palearctic. ................................................. .......................... Quedius sundukovi Smetana, 2003 – Elytra normal, not shortened, about as long as pronotum ( Fig. K9B ), with whitish apical seam on abdominal tergite VII. ............................................................ 10 10 Basal three antennomeres at least slightly darkened ( Fig. K10A ). ......................................................... 11 – Basal three antennomeres pale ( Fig. K10B ). ....... 13 11 Elytra most often reddish, very rarely darkened. Appendages only slightly darkened. Tibia, tarsi and apical antennomeres of antennae pale reddish brown ( Figs K11A, 11E ). Found near water bodies in Central-Eastern Europe and Middle Asia (Fig. 23). .. .................................. Quedius balticus Korge, 1960 – Elytra always dark. Appendages darkened. Tarsi slightly paler brown to dark brown at most ( Figs K11B , 10E–F ). Found at higher elevations or latitudes (Figs 25, 27). .......................................... 12 12 Head disc with fine isodiametric microsculpture ( Fig. K12A ). Without C-sclerite of the internal sac ( Fig. 16A ). Found at alpine sites of Central and Southern Europe ( Fig. K12C ). .................................................. ...................... Quedius unicolor Kiesenwetter, 1847 – Head disc most often with microsculpture of fine transverse waves, rarely isodiametric ( Fig. K12B ). With clear C-sclerite of the internal sac ( Fig. 15C ). Found disjunct in boreal Scandinavia and Russia , as well as alpine in Altai Mountains and Transbaikalia ( Fig. K12D ). ..... Quedius subunicolor Korge, 1961 13 Body brown. Elytra yellowish red. Apex of paramere pointing ventral, away from median lobe in form of a small blunt hook ( Figs K13B , 15A ). Central Anatolia , Middle East, Transcauscasus, Central Asia ( Fig. K13A ). ..... Quedius vicinus ( Ménétriés, 1832 ) – Body most often black, or at most brownish. Elytra brick or brownish red. Apex of paramere straight, not pointing ventrad, away from median lobe ( Figs K13C–D , 15D, 15F ). Distribution more northern ( Figs K14A–B )...................................................... 14 14 C-shaped sclerite of internal sac without spine-like basal extension ( Figs K13C , 15F ). SE European distribution ( Fig. K14A ). ........................................... ........... Quedius meridiocarpathicus Smetana, 1958 – C-shaped sclerite of internal sac with spine-like basal extension ( Figs K13D , 15D ). N Palearctic distribution ( Fig. K14B ). ........................................... ............... Quedius molochinus ( Gravenhorst, 1806 ) 15 Basal three antennomeres pale and antennae more elongate (antennomere 10 clearly longer than wide) ( Fig. K15A ). Elytra light to dark brown. Generally larger. Forebody length 5.49–5.93 (5.78) mm ( Fig. 13F ). Boreal North America (Fig. 28). ...................... ..................... Quedius labradorensis Smetana, 1965 – Basal three antennomeres darkened and antennae more robust (antennomere 10 more or less transverse) ( Fig. K15B ). Elytra black or reddish. Generally smaller. Forebody length 4.97–5.86 (5.39) mm. ........................................................... 16 16 Paramere with basal attenuation and broadening towards apex forming a spoon like shape, peg setae situated in a semi-circle along the edge of the paramere ( Figs K16A , 8 , 17B ). Coastal to mid elevation from Oregon to Southern Alaska including Vancouver and Haida Gwaii. ..................................... ...................................... Quedius horni Hatch, 1957 – Paramere only with at most slight attenuation forming a lanceolate shape ( Figs K16B–D ). ...................... 17 17 Distributed across Boreal North America. South of the Northern Rocky Mountains ( Fig. K17A ). Teeth of median lobe clearly folded inwards ( Figs K16B , 17E ). ......... Quedius molochinoides Smetana, 1965 – Central and Southern Rocky Mountains, Cascades, Blue Mountains and Sierra Nevada ( Fig. K17B ). Teeth of median lobe either protruding or not clearly formed ( Figs K16C–D ). ....................................... 19 18. Found in the Cascades, Blue Mountains and Sierra Nevada ( Fig. K18A ). Paramere and median lobe clearly broader ( Figs K16C , 17D ). ............................ ....................................... Quedius lanei Hatch, 1957 – Found in Central and Southern Rocky Mountains ( Fig. K18B ). Paramere and median lobe clearly more slender ( Figs K16D , 17C ). ........................................ ........................................... Quedius altanai sp. nov. 19 Paramere rather slender and clear C-sclerite of the internal sac ( Figs K19A , 15D ). Introduced in parts of Eastern North America, seems to be spreading. ........ ............... Quedius molochinus ( Gravenhorst, 1806 ) – Paramere rather broad and No C-sclerite of internal sac ( Figs K19B–C ). Q. laticollis -group .............. 20 20 Peg setae of paramere forming a solid triangular field, usually with two wide and short extensions posteriorly ( Figs K20A , 16E ). E North America ( Fig. K20B ). ........ Quedius laticollis ( Gravenhorst, 1802 ) – Peg setae of paramere arranged into two short longitudinal rows, which more or less diverge posteriorly ( Figs K20C , 16F ). Great American Plains ( Fig. K20D ). ........... Quedius strenuus Casey, 1915