Barypalpus shibatai, Schillhammer, 2019

Schillhammer, Harald, 2019, A review of Barypalpus Cameron, 1932 (Coleoptera: Staphylinidae) with descriptions of three new species, Zootaxa 4629 (4), pp. 571-582 : 574-575

Barypalpus shibatai sp. n.

Holotype ♂: “N-LAOS, May 1999, Oudom Xai prov. , Nam Miang riv., 30km SE Muang Xai, 1200m, Lao coll. leg.” ( NSMT) .— Paratype: 1 ♂: same data as holotype ( NMW) .

Description (Habitus: Fig. 2 ): 9.3–9.8 mm long (4.8–5.1 mm, abdomen excluded). Black, shining; mandibles dark brown, palpi and labrum pale reddish, antennae reddish brown; posterior margins of tergites V–VII narrowly dark reddish, that of tergite VII more broadly reddish, tergite VIII black with almost posterior half reddish; legs black to dark brown, protarsi reddish, meso- and metatarsi of similar color as tibiae at base, becoming paler distad, tarsomeres V usually reddish.

Head ( Fig. 10 ) rounded quadrangular, 1.21–1.23 times as wide as long, tempora subparallel or slightly divergent, 1.5–1.6 times as long as eyes, dorsal surface with only a few larger setiferous punctures along medial margin of eyes, on tempora and along base of head; hind angles of head broadly rounded; surface without microsculpture or with very faint, almost indiscernible traces of isodiametric microsculpture, in addition, with moderately dense micropunctation; antennae moderately long, segments 4–5 slightly oblong, segments 6–8 about as long as wide, segments 9 and 10 slightly transverse; pronotum slightly oblong, 1.06–1.10 times as long as wide, sides subparallel, in one specimen (paratype) slightly more distinctly narrowed posteriad than anteriad, surface without any setiferous punctures, micropunctation much less dense than on head, isodiametric microsculpture hardly discernible or lacking; scutellum moderately coarsely and moderately densely punctate; elytra ( Fig. 14 ) along sides markedly longer than pronotum along midline, with moderately dense and moderately coarse punctation, becoming somewhat finer laterad, with a longitudinal row of larger punctures sublaterally, hypomera densely, moderately coarsely punctate; abdominal characters hardly differing from those of B. ruficornis .

Aedeagus ( Figs 19, 20 , 26 ) with apical portion of median lobe widened as in B. ruficornis in ventral view ( Fig. 19 ), in lateral view ( Fig. 20 ) slightly bent toward paramere but not hooked, paramere ( Fig. 26 ) almost as long as median lobe, slightly narrowed toward apex, broad in lateral view, peg setae irregularly arranged in two diffuse longitudinal subapical clusters, regular setae rather short.

Female unknown.

Diagnosis: The species differs from both B. ruficornis and B. holzschuhi by the larger eyes, from the latter by the broader head and sparser, more irregular elytral punctation, and from B. chinensis by the darker color and broader head.

Distribution: The species is known only from the type locality.

Etymology: The species is named in honor of Yasutoshi Shibata, staphylinid expert from Japan, who has provided me with highly interesting material during the past two decades.

Figures

FIGURES 1–2. Habitus of Barypalpus ruficornis Cameron (1); B. shibatai sp. n. (2).

FIGURES 9–12. Head (dorsal view) of Barypalpus ruficornis (9), B. shibatai sp. n. (10), B. holzschuhi sp. n. (11), B. chinensis sp. n. (12).

FIGURES 13–16. Elytra of Barypalpus ruficornis (13), B. shibatai sp. n. (14), B. holzschuhi sp..n. (15), B. chinensis sp. n. (16).

FIGURES 17–24. Aedeagus of Barypalpus ruficornis (17, 18), B. shibatai sp. n. (19, 20), B. holzschuhi sp. n. (21, 22), B. chinensis sp. n. (23, 24)—ventral view (17, 19, 21, 23), lateral view (18, 20, 22, 24).

FIGURES 25–29. Paramere of Barypalpus ruficornis (25), B. shibatai sp. n. (26), B. holzschuhi sp. n. (27), B. chinensis sp. n. (28); male sternite VIII of B. ruficornis (29).