Dianous nitidulus LeConte, 1874

Webster, Reginald P., Davies, Anthony E., Klimaszewski, Jan & Bourdon, Caroline, 2016, Further contributions to the staphylinid fauna of New Brunswick, Canada, and the USA, with descriptions of two new Proteinus species (Coleoptera, Staphylinidae), ZooKeys 573, pp. 31-83 : 56-57

Taxon classification Animalia Coleoptera Staphylinidae

Dianous nitidulus LeConte, 1874

Material examined.

New Brunswick, Albert Co., Caledonia Gorge P.N.A., 45.7930°N, 64.7764°W, 1.VII.2011, R. P. Webster //Small rocky clear-cold river [Caledonia Brook], splashing exposed rocks covered with moss in middle of river (1 ♀, NBM); Caledonia Gorge P.N.A., 45.7808°N, 64.7775°W, 4.VII.2011, R.P. Webster // Canada Creek, cold-clear, shaded rocky brook with small waterfalls, sifting saturated moss on rocks near flowing water (1 ♀, NBM); Caledonia Gorge P.N.A., 45.8432°N, 64.8411°W, 5.VII.2011, R.P. Webster // Turtle Creek, rocky, cool-water, shaded creek, in saturated moss on rocks 1 ♂, NBM); Caledonia Gorge P.N.A., 45.7985°N, 64.7755°W, 18.VIII.2012, R.P. Webster // Crooked Creek near Caledonia Brook, splashing sun-exposed moss covered rocks (1 ♂, NBM); Caledonia Gorge P.N.A., 45.7706°N, 64.8063°W, 2.VII.2011, 12.IX.2012, R.P. Webster // McKinley Brook, in moss on rocks in shaded brook (2 ♀, NBM). Carleton Co., Belleville, Meduxnekeag Valley Nature Preserve, 46.1895°N, 67.6704°W, 11.VI.2010, R.P. Webster // Rich Appalachian hardwood forest, margin of shaded spring-fed brook near small waterfall (2 sex undetermined, RWC). Madawaska Co., Gagné Brook at First Lake, 47.6077°N, 68.2534°W, 23.VI.2010, M. Turgeon & R. Webster // Northern hardwood forest, shaded brook, among gravel on gravel bar, splashing and turning gravel (1 ♂, NBM); at Green River, 47.6918°N, 68.3202°W, 21.VI.2010, M. Turgeon & R. Webster // River margin, among gravel on gravel bar (1 ♂, NBM); Jalbert Brook, 262 m elev., 47.6470°N, 68.3026°W, 23.VI.2010, R.P. Webster // Old-growth mixed forest, shaded brook, on gravel on gravel bar (1 sex undetermined, RWC). Restigouche Co., Jacquet River Gorge P.N.A. 47.8010°N, 66.0963°W, 15.VI.2009, 24.V.2010, R. P. Webster // Cold shaded brook, on rocks or in moss on rocks on brook margin or within brook (5 sex undetermined, NBM; 1, ♂, 1 ♀, 5 sex undetermined, RWC); same locality and collector, 47.8257°N, 66.0779°W, 24.V.2010 // Partially shaded cobblestone bar near outflow of brook at Jacquet River, under cobblestones & grav el on sand (1, NBM); Kedgwick Forks, 47.9085°N, 67.9057°W, 23.VI.2010, R. P. Webster // River margin, on clay/sand under alders (1 ♀, NBM).

Distribution in Canada and Alaska.

AK, YT, BC, AB, SK, QC, NB, NS, NF ( Bousquet et al. 2013).

Natural history.

In NB, most specimens of Dianous nitidulus were found along fast-flowing, cold, shaded brooks, shaded streams, and shaded river margins. Adults occurred on rocks or in moss (often saturated with water) on rocks on the stream margin and within the streams themselves. Some individuals were found on gravel bars or on clay/sand along shaded brooks and river margins. Adults were collected by splashing moss, rocks, and gravel in the above habitats, in May, June, July, and September.