Callicerus rigidicornis (Erichson)

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 : 61-64

Taxon classification Animalia Coleoptera Staphylinidae

Callicerus rigidicornis (Erichson) Figs 77-83

Homalota rigidicornis Erichson 1839: 82. As Callicerus : Assing 2001: 286; Brunke et al. 2012: 175.

Diagnosis.

There are two adventive species of Callicerus reported from Canada ( Brunke et al. 2012). Males of Callicerus rigidicornis do not have their antennomere X conspicuously elongate (Fig. 77) as in Callicerus obscurus (for illustration, see Brunke et al. 2012). Callicerus rigidicornis may be distinguished externally from Callicerus obscurus by the more transverse pronotum (Fig. 77), larger body (length 3.5-5.0 mm), and by body colouration with lighter basal half of abdomen (entirely dark brown in Callicerus obscurus ). The habitus and genital structures of Callicerus rigidicornis are illustrated in Figs 77-83. For details of European Callicerus species, see Assing (2001).

Distribution.

Bionomics.

The Newfoundland females were captured using pitfall traps in agricultural fields in 2007. In Ontario, specimens were collected in agricultural hedgerows using pitfall traps in 2009 and 2010 ( Brunke et al. 2012). Adults were collected in May and June.

Comments.

Callicerus rigidicornis was recorded from North America as an adventive species for the first time based on Ontario specimens collected in agricultural hedgerows ( Brunke et al. 2012). The NL record may suggest a broader distribution of this adventive species in Canada, but it is unknown whether these records represent separate introduction events. For information on natural history of this species in Europe, see Assing (2001).