Atheta (Microdota) curtipenis Klimaszewski & Webster

Klimaszewski, Jan, Webster, Reginald P., Sikes, Derek, Bourdon, Caroline & Labrecque, Myriam, 2015, A review of Canadian and Alaskan species of the genera Clusiota Casey and AthetaThomson, subgenusMicrodota Mulsant & Rey (Coleoptera, Staphylinidae, Aleocharinae), ZooKeys 524, pp. 103-136 : 110-111

Taxon classification Animalia Coleoptera Staphylinidae

Atheta (Microdota) curtipenis Klimaszewski & Webster sp. n. Figs 17-24

Holotype (male).

Canada, New Brunswick, Saint John Co., ca 2 km NE of Maces Bay, 45.1168°N, 66.4552°W, 8.V.2006, R.P. Webster, coll. // eastern white cedar swamp, under moose dung (LFC). Paratypes: labelled as the holotype (RWC) 1 male, 1 female.

Etymology.

The specific name curtipenis refers to a short median lobe of aedeagus of this species.

Diagnosis.

Body length 2.0-2.3 mm, subparallel, moderately convex, dark brown, abdomen slightly darker than remainder of the body, legs yellowish brown (Fig. 17); integument glossy, densely punctate and densely pubescent on forebody and less so on head and abdomen, microsculpture of forebody fine; head slightly narrower than pronotum, strongly narrowed posteriad and slightly angular posteriorly, eyes large and slightly shorter than postocular area dorsally; pronotum transverse, narrower than elytra; elytra wider and longer than pronotum; abdomen subparallel. MALE. Tergite VIII truncate apically (Fig. 18); sternite VIII broadly rounded apically (Fig. 19); median lobe of aedeagus narrowly oval in dorsal view (Fig. 20), tubus sinuate basally and then straight and rounded apically in lateral view (Fig. 21); internal sac structures as illustrated (Figs 20, 21). FEMALE. Tergite VIII truncate apically (Fig. 22); sternite VIII slightly emarginated apically (Fig. 23); spermatheca compressed S-shaped, capsule spherical with short and narrow apical invagination, stem narrow and U-formed posteriorly (Fig. 24).

Natural history.

Adults were found in an eastern white cedar swamp under moose dung in May.

Distribution.

Known only from NB, Canada.

Comments.

This species is distinguished by the moderately transverse pronotum, and the shape of the median lobe of the aedeagus and spermatheca.