Stethusa spuriella (Casey)

Klimaszewski, Jan, Langor, David W., Bourdon, Caroline, Gilbert, Amelie & Labrecque, Myriam, 2016, Two new species and new provincial records of aleocharine rove beetles from Newfoundland and Labrador, Canada (Coleoptera, Staphylinidae, Aleocharinae), ZooKeys 593, pp. 49-89 : 68

Taxon classification Animalia Coleoptera Staphylinidae

Stethusa spuriella (Casey) Figs 101-108

Atheta (Stethusa) spuriella Casey, 1910: 8. As Stethusa : Gusarov 2003b: 239; Brunke et al. 2012: 181.

Diagnosis.

This species may be distinguishable from two other Nearctic Stethusa species by the following combination of characters ( Gusarov 2003b): Stethusa spuriella differs from Stethusa dichroa (Gravenhorst) in a smaller body size (length 2.1-2.5 mm), the lack of sub-basal impressions of the terminal antennal article (Fig. 101), the lack of the distal spines of the internal sac (Figs 102, 103); the shape of the spermatheca (Fig. 108); and the lack of a female accessory sclerite. Stethusa spuriella differs from Stethusa klimschi (Bernhauer) in having a smaller body size, the bent apex of the median lobe in lateral view (Fig. 102), and a shorter spermatheca (Fig. 108).

Distribution.

Bionomics.

In Newfoundland, one female was captured in a pitfall trap in mixed forest. In Ontario, Stethusa spuriella appears to be a common species in both forested and open habitats, some specimens were captured on fungi ( Brunke et al. 2012). Adults were collected from May to August.

Comments.

This species probably reaches its northernmost distribution limit in Newfoundland.