Trichiusa compacta Casey, 1894

Brunke, Adam J., Klimaszewski, Jan, Dorval, Julie-Anne, Bourdon, Caroline, Paiero, Steven M. & Marshall, Stephen A., 2012, New species and distributional records of Aleocharinae (Coleoptera, Staphylinidae) from Ontario, Canada, with a checklist of recorded species, ZooKeys 186, pp. 119-206: 157

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Trichiusa compacta Casey, 1894

New Canadian Record

Trichiusa compacta Casey, 1894   New Canadian Record Figs 76155-157Map 76

Trichiusa compacta   Casey, 1894: 341. Lectotype(female): USA, DC; Type USNM 39416; Casey bequest 1925; Lectotypus, male, Trichiusa compacta   Casey, V.I. Gusarov des. 2010 [unpublished designation]; our lectotype designation label, present designation (NMNH).

Material examined.

CANADA: ON: Chatham-Kent Co.,Rondeau Prov. Pk., 1 to 9.viii.1985, Int. trap at edge of oak forest, L. LeSage & A. Woodliffe, 1 (CNC), Rondeau Prov. Pk., South Point Trail, slough forest, leaf litter, 27.ix.2009, Brunke & Cheung, 1 (DEBU); Hald.-Norfolk Reg., Cronmiller prop., 6 km W St. Williams, 42°40'21"N, 80°29'26"W, forest, Berlese vernal pool litter, 17.v.2011, A. Brunke, 1 (DEBU), Cronmiller prop., 6 km W St. Williams, 42°40'20"N, 80°29'29"W, forest, sand ridge, malaise pans, 17 to 31.v.2011, Brunke & Paiero, 1 (DEBU), Cronmiller prop., 6 km W St. Williams, 42°40'21"N, 80°29'26"W, low forest, malaise, 17 to 31.v.2011, Brunke & Paiero, 1 (DEBU).


Canada: ON; USA: DC, OH. Native.


The species of Trichiusa   are currently under revision by V. Gusarov and so Trichiusa compacta   is currently best recognized by the combination of habitus and the following sexual characters: median lobe of aedeagus in lateral view with tubus narrow, evenly subparallel and narrowly rounded apically (not sharp) (Fig. 156); spermatheca with moderately large, spherical and basally narrowed capsule bearing a deep apical invagination, stem C-shaped, looped and twisted posteriad (Fig. 157).

Trichiusa compacta   appears to be forest inhabiting and was collected from a variety of passive traps and by sifting litter near vernal and semi-permanent forest pools.