Chilocorus renipustulatus (Scriba, 1791)

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

Chilocorus renipustulatus (Scriba, 1791) Figure 33

Distribution.

Native to the Palaearctic region. Widespread in Europe, also recorded from Siberia and the Russian Far East ( Kovář 2007). Adventive in the Nearctic region (Ontario, Canada).

Canadian records.

Ontario: Hamilton, 22-Sep-2014 to 03-Oct-2014 (1 ex, CBG); Mississauga, 19-Sep-2016 to 30-Sep-2016 (3 exx, CBG); Windsor, 22-Sep-2014 to 03-Oct-2014 (1 ex, CBG).

Diagnostic information

(based on Fürsch 1967 and Gordon 1985). Body length 4-5 mm. Habitus as in Fig. 33A . Black, shiny, with a single rounded or slightly transverse orange-red macula on each elytron, abdomen laterally and apically orange, medial part of first ventrite black. Pronotum without distinct microsculpture on disc. Male genitalia as in Fig. 33B, C .

Bionomic notes.

The main habitat in Europe is broadleaf forest, and the preferred prey are scale insects, in particular Chionaspis salicis (Linnaeus, 1758) ( Koch 1989b). The Canadian specimens were collected with Malaise traps in suburban residential areas.

Comments.

Chilocorus kuwanae Silvestri, 1909, an East Asian species introduced to the United States and recorded from across the country ( Gordon 1985; Hendrickson et al. 1991), was recently synonymized with C. renipustulatus by Bieńkowski (2018). According to Bieńkowski, male genitalia are similar throughout the distribution areas of both species. However, Bieńkowski did not study any type material. One of the Canadian specimens shares an identical barcode haplotype with specimens of C. renipustulatus from Germany and Finland, others are slightly divergent (p-distance to European material varies from 0.006 to 0.015). Unfortunately, no barcode data are available for C. kuwanae . No Canadian records have been previously published under either name.

Chilocorus renipustulatus is externally very similar to Chilocorus stigma (Say, 1835) and its closest relatives. It can be distinguished using the male genitalia and microsculpture of the pronotum. In C. stigma and allied species, the interspace between punctures on the disc of the pronotum is covered by finely engraved, netlike microsculpture. In C. renipustulatus , the interspace is smooth and shiny, with no visible microsculpture on disc. The orange maculae on the elytra are more transverse in C. renipustulatus than in C. stigma in the examined DNA barcoded Canadian material of these species, but the maculae are known to vary in size and shape in C. renipustulatus ( Bieńkowski, 2018).

Figures

Figures 33, 34. 33 Chilocorus renipustulatus (Scriba) 33 A habitus, L. Borowiec 33 B median lobe (penis guide) and parameres, ventral view 33 C penis (sipho), tip in lateral view 34 Nephus bisignatus (Boheman) 34 A habitus, S. Karjalainen 34 B median lobe (penis guide) and parameres, lateral view 34 C penis (sipho), tip in lateral view. Scale bars: 1.0 mm (33 A), 0.5 mm (33 B; 34 A), 0.2 mm (33 C; 34 B), 0.1 mm (34 C).