Cephennomicrus acupunctatus, Jałoszyński, 2017

Jałoszyński, Paweł, 2017, Ant-like stone beetles on the roof of the world. Cephenniini of Nepal and Bhutan (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4349 (1), pp. 1-120 : 8-9

Cephennomicrus acupunctatus sp. n.

( Figs 3 , 6, 10–11 , 17 )

Type material. Holotype: NEPAL (Sankhuwasabha District): ♂, " NEPAL, Sanhua Sabha Distr. / Arun Valley between Mure and Hurure / 2050–2150 m alt., 9.–11.VI.1988 / leg. J. Martens & W. Schawaller" [white, printed] ( SMNS).

Diagnosis. BL ~ 0.8 mm; head and pronotum covered with small but deep and dense punctures; elytra with fine but distinct punctures; aedeagus with lightly sclerotized bell-shaped internal armature, in lateral view subapical margin of dorsal wall strongly curved.

Description. Body of male ( Figs 3 , 6 ) elongate, with distinct constriction between pronotum and elytra, strongly convex, dark brown, covered with slightly lighter vestiture; BL 0.83 mm.

Head subtrapezoidal, HL 0.10 mm, HW 0.20 mm; vertex and frons confluent, evenly convex; supraantennal tubercles barely marked; eyes large, strongly convex, coarsely faceted. Punctures on vertex and frons moderately large and deep, densely and unevenly distributed, separated by spaces 0.5–1 × as wide as diameters of punctures; setae short, sparse and nearly recumbent. Antennae short, compact, slender, with trimerous and strongly thickened club, AnL 0.33 mm; antennomere I nearly twice as long as broad; II distinctly shorter and slightly narrower than I, 1.7 × as long as broad; III much narrower and shorter than II, slightly broader than long; IV–VIII subequal in length and width, each as broad as III but slightly longer, 1.1–1.2 × as long as broad; IX distinctly broader and slightly longer than VIII, as long as broad; X much larger than IX, distinctly transverse; XI as broad as X but slightly longer, with distinct subapical constriction.

Pronotum in dorsal view nearly subquadrate, equally broad between anterior fourth and base, PL 0.25 mm, PW 0.33 mm; anterior margin strongly arcuate; lateral margins indistinctly microserrate, nearly straight and parallel; hind corners nearly right-angled; posterior margin slightly arcuate; base of pronotum with two pairs of small but distinct lateral antebasal pits, obscured by very dense, moderately large and very deep punctures covering pronotal disc, distances between punctures distinctly shorter than diameters of punctures. Setae short and sparse, slightly suberect, additionally each hind corner bears one long, erect seta.

Elytra oval, moderately stout, broadest near anterior third, EL 0.48 mm, EW 0.40 mm, EI 1.19. Humeral calli small but well marked, mesally delimited by oblique, deep, relatively narrow basal impression; apices of elytra separately rounded. Punctures very small but relatively deep and sharply marked, dense; setae very short, but well visible under magnification 40 ×, dense and nearly recumbent, additionally each elytron bears a single long seta located in subhumeral area of lateral margin.

Hind wings not studied.

Aedeagus ( Figs 10–11 ) thin-walled, AeL 0.13 mm, with subtrapezoidal apex; internal armature composed of lightly sclerotized, bell-shaped structures located in middle of median lobe; parameres very slender, each with three apical setae.

Female. Unknown.

Distribution ( Fig. 17 ). Eastern Nepal.

Etymology. The name refers to particularly sharply marked, distinct punctures covering the pronotum.

Remarks. See remarks for C. arunensis .

Figures

FIGURES 2 – 4. Dorsal habitus of Cephennomicrus arunensis sp. n. (2), Cm. acupunctatus sp. n. (3), and Cm. taplejungensis sp. n. (4).

FIGURES 5 – 13. Body outline (5 – 7) and aedeagus in ventral (8, 10, 12) and lateral (9, 11, 13) views. Cephennomicrus arunensis sp. n. (5, 8 – 9), Cm. acupunctatus sp. n. (6, 10 – 11), and Cm. taplejungensis sp. n. (7, 12 – 13).

FIGURES 17 – 18. Distribution of Cephennomicrus arunensis sp. n. (17, circle), Cm. acupunctatus sp. n. (17, circle), Cm. taplejungensis sp. n. (17, triangle) and Hlavaciellus primitivus sp. n. (18, circle).