Gyronycha pseudoobscura Klimaszewski & Webster

Klimaszewski, Jan, Webster, Reginald P., Zanetti, Adriano & Bourdon, Caroline, 2017, First Canadian records of genera Apimela Mulsant & Rey and Gyronycha Casey from New Brunswick: description of two new species and new provincial distribution records (Coleoptera, Staphylinidae, Aleocharinae), ZooKeys 672, pp. 35-48 : 39-40

Gyronycha pseudoobscura Klimaszewski & Webster sp. n. Figs 23-26

Holotype

(female). CANADA, New Brunswick, Restigouche Co., Jacquet River Gorge PNA, 47.8257°N, 66.0779°W, 24.V.2010, R.P. Webster coll. // partially shaded cobblestone bar near outflow of brook at Jacquet River, under cobblestones and gravel on sand (LFC). PARATYPE: New Brunswick, Queens Co., Bayard at Nerepis River, 45.4426°N, 66.3280°W, 24.V.2008, R.P. Webster coll. // River margin, in gravel (RWC) 1 female.

Etymology.

The name of this new species, pseudoobscura , derives from a similar species of Gyronycha obscura Casey described from California, USA.

Description.

Body length 3.9-4.0 mm, subparallel, yellowish brown with head and pronotum and antennae dark brown, moderately glossy, forebody with fine and dense pubescence, punctation fine; head round, eyes moderately large and shorter than postocular region of head, posterior angles rounded, pubescence directed straight and obliquely anteriad; antennomeres V-X slightly elongate, head about as broad as pronotum; pronotum slightly transverse, posterior angles slightly angular; elytra elongate, at suture longer than pronotum, and about one fifth wider than pronotum, abdomen subparallel, with first visible four tergites deeply impressed basally. MALE. Unknown. FEMALE. Spermatheca with subspherical capsule, and with apical narrow, tubular and coiled apically projection, stem sinuate, with large, overlapping coils (Fig. 26); tergite VIII truncate apically (Fig. 24); sternite VIII rounded apically (Fig. 25).

Collection and habitat data.

The holotype was captured under cobblestones and gravel on sand on a partially shaded cobblestone bar near the outflow of a brook flowing into the Jacquet River. The paratype was captured in gravel along a river margin.

Comments.

This species is similar externally and has similar shape of spermatheca and female tergite and sternite VIII to those of G. obscura Casey. Gyronycha pseudoobscura may be distinguished from G. obscura by narrower body, dark brown color of head and pronotum (light brown in G. obscura ), and the differently shaped pronotum with anterior angles rounded and strongly converging apically in apical part of the disc, while the pronotal angles are rectangular and moderately converging apically in G. obscura . The two species have allopatric distribution, and are known from remote and disjunctive localities in New Brunswick, Canada, and California, United States of America.