Sinacrulia fortiterpunctata, Shavrin, 2023

Shavrin, Alexey V., 2023, A new genus of Omaliini from China (Coleoptera: Staphylinidae: Omaliinae), Zootaxa 5375 (3), pp. 429-438 : 435-436

Sinacrulia fortiterpunctata sp.n.

( Figs 1 , 3–12 , 16–17 )

Type material examined. Holotype ♂ ( Fig. 1 ; dissected; a plastic plate with aedeagus in Canada balsam was pinned under the card with the beetle; mouthparts, abdominal tergite VIII, sternite VIII and apical segment are glued on the same card under the specimen): ‘ CHINA: Yunnan [ CH 07-03], | Dali Bai Auton[omous]. Pref[ecture]., Diancang Shan W | Dali, 25°41’49’’N, 100°06’24’’E | 2970 m, sifted at rock edges and under | small shrubs, 28. V.2007, M. Schülke’ <printed>, ‘Museum für Naturkunde | Berlin | Sammlung M. Schülke’ <printed>, ‘ Sinaculia | fortiterpunctata Shavrin sp.n. | Shavrin A. V. des. 2023’ <red label, printed> (cSch).

Description. Measurements: HW: 0.42; HL: 0.27; OL: 0.09; TL: 0.05; AL: 0.68; PL: 0.32; PWmax: 0.55; PWmin: 0.50; ESL: 0.69; EW: 0.74; MTbL: 0.37; MTrL: 0.15 (MTrL 1–4: 0.05; MTrL 5: 0.10); AW: 0.72; AedL: 0.25; BL: 2.22.

Habitus as in Fig. 1 . Body brown, with distinctly paler apical tergites of the abdomen; antennomeres 9–11, femora and tibiae yellow-brown; mouthparts, antennomeres 1–8 and tarsi yellowish. Frontal portion of clypeus without punctures, middle portion of head between anterior margins of eyes with dense and moderately fine punctation, punctation in middle dense and moderately large, dorsal portions around eyes with dense, indistinct and very fine punctures; neck with very dense and fine regular pucntation; punctation of pronotum very dense, large and deep, with interstices between punctures in middle about as broad as diameters of one-two nearest punctures, punctation sparser and finer in medioapical and mediobasal, and sparser in lateral portions; punctation of elytra about as that on pronotum, but coarser and deeper, especially in medioapical portion of each elytron, finer and sparser around scutellum and markedly sparser and finer along suture; abdominal tergites without visible punctures.

Head 1.5 times as broad as long, with narrow indistinct transverse elevation between ocelli. Surface between punctures in middle with distinct, irregular, transverse and longitudinal elevations. Neck with narrow longitudinal elevations between punctures. Ocelli convex and moderately large; distance between ocelli about 1.3 times as long as distance between ocellus and posterior margin of eye. Labrum as in Fig. 3 . Mandibles as in Figs 4−5 . Labium as in Fig. 6 . Mentum as in Fig. 7 . Maxilla as in Fig. 8 . Antenna with very wide oval basal antennomere slightly less than twice as long as broad, antennomere 2 oblong and moderately broad, slightly narrower and distinctly shorter than basal antennomere, 3 narrow, slightly shorter and about twice narrower than 2, 4−5 small, suboval, about twice shorter than 3, 6 very small, distinctly shorter than 5, about as long as broad, 7 slightly transverse, markedly longer and broader than 6, 8 slightly shorter and more transverse than 7, 9−10 transverse, slightly longer than 8, apical antennomere about 1.2 times as long as 10, from about middle gradually narrowed toward rounded apex.

Pronotum 1.7 times as broad as long, 1.3 times as broad as head, widest in middle, slightly more narrowed posteriad than anteriad; anterior angles widely rounded; posterior angles obtuse; anterior margin widely rounded, slightly shorter than somewhat straight basal margin; lateral margins with regular small acute thorn-shaped crenulation, stronger and more regular laterobasally. Median surface with distinct transverse elevations in medioapical portion and longitudinal elevations in middle and lateral portions.

Elytra indistinctly broader than long, slightly more than twice as long as pronotum; hind margins rounded, mediobasal portion along suture and below scutellum indistinctly depressed. Surface between punctures in mediobasal basal part with transverse and diagonal elevations, stronger in mediobasal portion of each elytron, surface between punctures in lateral and apical portions with distinct longitudinal elevations.

Male. Posterior margin of abdominal tergite VIII rounded ( Fig. 11 ). Posterior margin of abdominal sternite VIII widely concaved ( Fig. 12 ). Aedeagus ( Fig. 9 ) short, with very wide basal part, gradually narrowed toward middle, with elongate and moderately narrow accessory plates rounded apically; median lobe very wide, with widelrounded lateral margins in about middle, strongly narrowed toward subacute apex; parameres wide and short, reaching widest part of median lobe, slightly narrowed toward widely rounded apices and slightly concaved on outer margins in preapical portions, each paramere with three moderately short apical setae and a row of four setae along each inner margin; internal sac short, weakly sclerotized, with very long flagellum, sprially folded in middle portion. Lateral aspect of the aedeagus as in Fig. 10 ; inner margin slightly above middle of each paramere forming elongate triangular tooth with acute apex.

Female unknown.

Distribution. Sinacrulia fortiterpunctata sp.n. is known only from the type locality in Diancang Shan mountains in Yunnan, China ( Fig. 17 ).

Etymology. The specific epithet is the Latin adjective fortiterpunctatus, - a, - um (with strong punctation). It alludes to strong punctation of the pronotum and the elytra.

Natural history. Specimen was collected by sifting of litter at rock edges and under small shrubs at elevation 2970 m a.s.l. (photograph of the type locality as in Fig. 16 ).

Figures

FIGURE 16. Type locality of Sinacrulia fortiterpunctata in the Diancang Shan, Yunnan, China (photograph: M. Schülke).

FIGURE 17. Distribution of Sinacrulia in China (black circle: S. fortiterpunctata, white circle: S. sp.).

FIGURES 1–2. Habitus of Sinacrulia: 1–S. fortiterpunctata (holotype), 2–S. sp. Scale bars: 1.0 mm.

FIGURES 3–8. Mouthparts of Sinacrulia fortiterpunctata (holotype): 3–labrum (dorsal view), 4–left mandible (dorsal view), 5–right mandible (dorsal view), 6–labium (ventral view), 7–mentum (ventral view), 8–right maxilla (dorsal view). Scale bars: 0.1 mm.

FIGURES 9–10. Aedeagus of Sinacrulia fortiterpunctata (holotype): 9–parameral view, 10–lateral view. Scale bar: 0.1 mm.

FIGURES 11–15. Abdominal segments of Sinacrulia (Figs 11–12: S. fortiterpunctata (holotype), Figs. 13–15: S. sp.): 11–male tergite VIII (dorsal view), 12–male sternite VIII (ventral view), 13–female tergite VIII (dorsal view), 14–female sternite VIII (ventral view), 15–female genital segment (dorsal view). Scale bars: 0.1 mm.