Tachyporus atriceps Stephens, 1832

Pentinsaari, Mikko, Anderson, Robert, Borowiec, Lech, Bouchard, Patrice, Brunke, Adam, Douglas, Hume, Smith, Andrew B. T. & Hebert, Paul D. N., 2019, DNA barcodes reveal 63 overlooked species of Canadian beetles (Insecta, Coleoptera), ZooKeys 894, pp. 53-150 : 53

Tachyporus atriceps Stephens, 1832 Figure 5

Distribution.

Native to the Palaearctic region, where it is widespread ( Schülke 2012b). Adventive in the Nearctic region (British Columbia, Ontario, Quebec, Nova Scotia, New Brunswick, and Prince Edward Island, Canada).

Canadian records

(DNA barcoded specimens). British Columbia: Burnaby, 21-Sep-2015 to 02-Oct-2015 (1 ex, CBG). Ontario: Ancaster, 21-Sep-2015 to 02-Oct-2015 (1 ex, CBG); Ausable-Bayfield Conservation Authority, 30-Jun-2015 (1 ex, CBG); Cambridge, 22-Sep-2014 to 03-Oct-2014 (2 exx, CBG); Cambridge, 24-Apr-2015 to 01-May-2015 (49 exx, CBG); Carillon Park, 06-May-1982 (2 ex, CNC); Courtice, 19-Sep-2016 to 30-Sep-2016 (1 ex, CBG); Guelph, 22-Sep-2014 to 03-Oct-2014 (1 ex, CBG); Guelph, 23-Sep-2013 to 04-Oct-2013 (2 exx, CBG); Guelph, 26-Sep-2014 to 29-Sep-2014 (1 ex, CBG); Hartington, 04-Oct-2017 (1 ex, CBG); Mississauga, 24-May-2016 to 26-May-2016 (1 ex, CBG); Point Pelee National Park, 06-Jul-2015 (1 ex, CBG); Puslinch Township, 19-Sep-2010 to 27-Sep-2010 (2 exx, CBG); Puslinch Township, 24-Oct-2010 to 31-Oct-2010 (1 ex, CBG); Red Rock, 21-Sep-2015 to 02-Oct-2015 (1 ex, CBG); Rondeau Provincial Park, 09-Jul-2015 (1 ex, CBG); Rouge National Urban Park, 03-Jun-2013 to 09-Jun-2013 (13 exx, CBG); Rouge National Urban Park, 15-Sep-2013 (1 ex, CBG); Stayner, 21-Sep-2015 to 02-Oct-2015 (1 ex, CBG). Quebec: Forillon National Park, 16-Sep-2013 to 23-Sep-2013 (2 exx, CBG). New Brunswick: Florenceville-Bristol, 22-Sep-2014 to 03-Oct-2014 (3 exx, CBG); Fredericton, 19-Sep-2016 to 30-Sep-2016 (1 ex, CBG). Nova Scotia: Cape Breton Highlands National Park, 13-Sep-2013 to 20-Sep-2013 (1 ex, CBG); Hubbards, 19-Sep-2016 to 30-Sep-2016 (1 ex, CBG). Prince Edward Island: Prince Edward Island National Park, 11-Sep-2013 to 18-Sep-2013 (1 ex, CBG).

Additional Canadian records.

Ontario: Carillon Park, 06-May-1982 (2 exx, CNC); Renfrew County, 4 km SE Cobden, 15-Sep-1980 (1 ex, CNC); Wentworth County, Stoney Creek, 03-Mar-1973 (1 ex, CNC). Quebec: Montreal, 07-Sep-1984 (1 ex, CNC). Nova Scotia: Halifax, 1988 (1 ex, CNC).

Diagnostic information.

Body length 2.4-3.6 mm. Habitus as in Fig. 5A . Head black, strongly contrasting with pronotum, elytra with either medial and ovoid lateral markings across disc or disc nearly entirely darkened ( Fig. 5B ). Elytral chaetotaxy as in Fig. 5B , with sutural row of punctures and three rows of discal punctures, with two punctures in inner discal row. Aedeagus as in Fig. 5C .

Bionomic notes.

This species occurs in a variety of moist to very dry microhabitats ( Schülke 2012b). In the Nearctic, this species occurs in disturbed habitats. It was collected by Brunke et al. (2014) in soybean fields and adjacent hedgerows in Ontario (misidentified as T. canadensis Campbell, 1979, to which it is similar). The barcoded specimens were collected in suburban residential areas and protected land adjacent to cities, mainly with Malaise or pitfall traps. Some of the barcoded specimens are larvae extracted from soil or leaf litter.

Comments.

Tachyporus atriceps has the same elytral chaetotaxy as T. borealis Campbell, 1979, T. nimbicola Campbell, 1979, and T. canadensis Campbell, 1979 but can be separated from the first two by the elytra with discal markings. Tachyporus canadensis has a dark red-brown head, bright yellow pronotum, and either a pair of narrow linear lateral dark markings (and medial darkening) or entirely immaculate elytra, while T. atriceps has a deep black head, slightly darkened (dingy yellow-orange) pronotum and lateral elytral markings that are ovoid or entirely fused with the medial marking to form a broad darkened area over much of the elytra. The internal sac sclerite of T. atriceps is similarly shaped to T. nimbicola and T. borealis (cane-shaped, Fig. 5C ) while T. canadensis possesses a characteristic arc-shaped sclerite that is not hooked. Tachyporus atriceps appears to be common in at least southern Canada and has been present in the Nearctic since at least 1973. This species was probably recently introduced, or has only recently become widespread and common, as it was not detected by Campbell (1979). Tachyporus atriceps is split into two closely clustered BINs which show no differences in morphology, including male genitalia.

Figures

Figures 5, 6. 5 Tachyporus atriceps Stephens 5 A habitus 5 B elytral chaetotaxy (re-drawn from Assing and Schuelke 2012) and pattern variability 5 C aedeagus, ventral view, M. Schuelke, modified. Abbreviations: OD outer discal row, MD middle discal row, ID inner discal row, S sutural row 6 Amischa decipiens (Sharp) 6 A habitus 6 B spermatheca, re-drawn from Muona (1990). Scale bars: 1.0 mm (5 A; 6 A), 0.5 mm (5 B, C), 0.1 mm (6 B).