Gabrius appendiculatus (Sharp, 1910)

Brunke, Adam J. & Marshall, Stephen A., 2011, Contributions to the faunistics and bionomics of Staphylinidae (Coleoptera) in northeastern North America: discoveries made through study of the University of Guelph Insect Collection, Ontario, Canada, ZooKeys 75, pp. 29-68 : 45-46

Gabrius appendiculatus (Sharp, 1910)

Materials.

CANADA: ON: Huron Co., Auburn, Hullett-McKillop Rd. nr. Limekiln Line, 43.744, -81.507, soybean field, pitfall, 23-VI-2010 (1), 7-VII-2010 (2), A. Brunke; Auburn, Limekiln Line, 43.736, -81.506, soybean field, pitfall, 23-VI-2010 (1), 7-VII-2010 (1), 4-VIII-2010 (1), 18-VIII-2010 (1), A. Brunke; Waterloo Reg., Blair, Dickie Settlement Rd. nr. WhistleBear golf course, 43.373, -80.400, soybean field, pitfall, 23-VI-2009 (1), 7-VII-2009 (1), 21-VII-2009 (6), 4-VIII-2009 (1), A. Brunke; Blair, Dickie Settlement Rd. nr. WhistleBear golf course, 43.373, -80.400, hedgerow, canopy trap in buckthorn, 27-X-2009, A. Brunke (1); Blair, Fountain St. S. nr Speed River, 43.391 -80.373, soybean field, canopy trap, 15-IX-2009, A. Brunke (1);Blair, Whistlebare Rd. and Township Rd.1, 43.372, -80.362, hedgerow, pitfall, 4-V-2010, A. Brunke (1); Blair, Whistlebare Rd. and Township Rd.1, 43.372, -80.362, soybean field, pitfall, 29-VI-2010, A. Brunke (1); Blair, Whistlebare Rd. and Township Rd. 1, 43.367, -80.358, soybean field, pitfall trap, 13-VII-2010 (1), 25-VIII-2010 (1), A. Brunke; Wellington Co., Eramosa, Wellington County Rds. 124 and 29, 43.615, -80.215, hedgerow, pitfall, 4-V-2010, A. Brunke (2); Eramosa, Wellington County Rds. 124 and 29, 43.615, -80.215, soybean, pitfall, 15-VI-2010 (3), 29-VI-2010 (3), A. Brunke; Guelph, Victoria Rd. and Conservation Line, 43.580, -80.275, soybean field, pitfall, 21-VII-2009 (1), 4-VIII-2009 (6), 1-IX-2009 (4), A. Brunke; Guelph, Victoria Rd. and Conservation Line, 43.580, -80.275, soybean field, canopy trap, 4-VIII-2009 (1), 18-VIII-2009 (1), A. Brunke

Diagnosis.

Gabrius appendiculatus can be distinguished from congenersin the northeast by the following combination of characters: area between basal lines on tergites two and three impunctate; basal antennomeres not distinctly paler than rest of antenna; males with sternite eight broadly notched; females with tergite 10 pointed (as opposed to truncate) apically.

This Palaearctic species was first recognized in North America by Smetana (1989) (as Gabrius subnigritulus (Reitter)) based on specimens collected as early as 1978 in Ormstown, Québec and from other localities in British Columbia and Newfoundland; the earliest records from the west coast of North America were from 1979. Klimaszewski et al. (2005) newly recorded it from red spruce-dominated forests in New Brunswick. Herein we report the dispersal of Gabrius appendiculatus into the southern portion of Ontario from specimens collected in 2009-2010 (Map 25). No other specimens before this period are known to have been collected in Ontario. In its native range, Gabrius appendiculatus is widespread in distribution ( Smetana in Löbl and Smetana 2004). Numerous specimens collected from soybean fields in Ontario further support the conclusion of Smetana (1989) that this species is well-adapted to agricultural habitat in North America.