Acylomus ergoti Casey, 1890

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

Acylomus ergoti Casey, 1890 Figure 30

Distribution.

United States ( Gimmel 2013). Tinodemus grouvellei Guillebeau, 1894, synonymized under A. ergoti by Gimmel (2013), was described from Michigan.

Canadian records.

Ontario: Brantford, 19-Sep-2016 to 30-Sep-2016 (1 ex, CBG); Breslau, 22-Apr-2013 to 03-May-2013 (1 ex, CBG); Cambridge, 07-May-2015 to 14-May-2015 (3 exx, CBG); Cambridge, 14-May-2015 to 21-May-2015 (1 ex, CBG); Cambridge, 25-May-2015 to 31-May-2015 (1 ex, CBG); Elizabethtown-Kitley, 30-Apr-2010 to 02-May-2010 (1 ex, CBG); Elizabethtown-Kitley, 09-May-2010 to 14-May-2010 (1 ex, CBG); Elizabethtown-Kitley, 14-May-2010 to 18-May-2010 (1 ex, CBG); Elizabethtown-Kitley, 30-May-2010 to 02-Jun-2010 (1 ex, CBG); Embro, 22-Apr-2013 to 03-May-2013 (1 ex, CBG); Georgian Bay Islands National Park, 06-May-2013 to 12-May-2013 (1 ex, CBG); Georgian Bay Islands National Park, 12-May-2013 to 23-May-2013 (9 exx, CBG); Georgian Bay Islands National Park, 30-Jul-2013 to 06-Aug-2013 (1 ex, CBG); Hagersville, 23-Sep-2013 to 04-Oct-2013 (1 ex, CBG); Hartington, 28-Jun-2017 (1 ex, CBG); London, 22-Apr-2013 to 03-May-2013 (1 ex, CBG); Mississauga, 21-Sep-2015 to 02-Oct-2015 (1 ex, CBG); Orangeville, 22-Sep-2014 to 03-Oct-2014 (1 ex, CBG); Peterborough, 31-May-2015 to 06-Jun-2015 (1 ex, CBG); Peterborough, 29-Jun-2015 to 02-Jul-2015 (1 ex, CBG); Point Pelee National Park, 02-May-2012 to 09-May-2012 (8 exx, CBG); Point Pelee National Park, 16-May-2012 to 23-May-2012 (10 exx, CBG); Point Pelee National Park, 27-Jun-2012 to 04-Jul-2012 (1 ex, CBG); Point Pelee National Park, 05-Sep-2012 to 12-Sep-2012 (1 ex, CBG); Rouge National Urban Park, 07-Jun-2013 (2 exx, CBG); Rouge National Urban Park, 03-Jun-2013 to 09-Jun-2013 (10 exx, CBG); Rouge National Urban Park, 17-Jun-2014 to 24-Jun-2014 (1 ex, CBG); Rouge National Urban Park, 08-Jul-2014 to 15-Jul-2014 (1 ex, CBG); Williamstown, 22-Sep-2014 to 03-Oct-2014 (2 exx, CBG). Quebec: Montreal, 24-Jul-2014 to 02-Aug-2014 (1 ex, CBG); Montreal, 19-Sep-2014 to 26-Sep-2014 (1 ex, CBG). New Brunswick: Springfield, 21-Sep-2015 to 02-Oct-2015 (1 ex, CBG).

Diagnostic information

(based on the redescription of Tinodemus grouvellei by Švec 2002). Body length 2.0 mm. Oval, dark brown, elytral suture and base of pronotum laterally paler. Legs, antennae and mouthparts red, ventral side orange. Head and pronotum without microsculpture. Scutellum and elytra finely and densely transversely strigose. Sutural stria of elytra present in the apical 5/8. Male metatibiae short and widened apically, twice as wide at apex as proximally, medio-apical spine ca. twice as long as metatarsomere 1, curved at apex ( Fig. 30A ). Female metatibiae not modified. Male genitalia as in Fig. 30B, C .

Bionomic notes.

The Canadian specimens were collected in various habitats (grasslands, forests, wetlands, residential areas etc.), mainly with Malaise traps.

Comments.

The lack of a modern species-level revision of Acylomus prevents detailed comparison to most other Nearctic species of Acylomus . The only other species of Acylomus previously known from Canada, A. pugetanus Casey, 1916, was redescribed by Steiner and Singh (1987). It is darker, especially ventrally, and has different male genitalia and no apparent sexual dimorphism in metathoracic leg structure. At least one more species of Acylomus (BOLD:ACM7465) occurs in Canada according to DNA barcode data and initial morphological analysis of the barcoded specimens, but we have not been able to identify it to species level.

Figures

Figures 30, 31. 30 Acylomus ergoti Casey 30 A male metatibia, ventral view 30 B aedeagus, dorsal view 30 C tegmen, dorsal view 30 D tegmen, lateral view 31 Olibrus liquidus Erichson, habitus, L. Borowiec. Scale bars: 0.2 mm (30 A-D), 1.0 mm (31).