Naddia hainanensis Yang & Zhou, 2010

Yang, Zhuo & Zhou, Hong-Zhang, 2010, Three new species of Naddia Fauvel (Coleoptera: Staphylinidae) from China, Zootaxa 2531 (1), pp. 1-14 : 7-8

3. Naddia hainanensis Yang & Zhou , sp. n.

( Figs. 3A–I )

Type material. Holotype: CHINA: Hainan: ♂, Wuzhi Mountain [N24.95187°, E112.93079°], 785 m, 10.VII.2004, Jie Wu and Yongjie Chen collected ( IZCAS).

Description. Body length: 11.7 mm.

Male measurements (n = 1): HL: 1.81; HW: 2.18; CL: 0.67; PO: 0.88; PL: 2.06; PW: 2.25; EL: 2.74; EW: 2.84; ELS: 1.67.

Male. Body small, black, almost dull, elytra brown-black, mouthparts and posterior margin of abdominal segments reddish brown, tibiae yellow and tarsi brown.

Head ( Fig. 3C ) nearly quadrate, wider than long, sides almost straight and not widened backward, a little narrower than pronotum; eyes small, oval, moderately protruding from lateral outline of head, longitudinal diameter somewhat shorter than postocular area; base deeply and broadly emarginate, posterior angles obviously protruding backward with apices rounded; surface densely covered with umbilicate punctures, with short black pubescence. Antennae ( Fig. 3F ) short and stout, hardly reaching midlength of pronotum, moderately thickened, last segment distinctly longer than wide, almost oval-shaped, ratios of antennomere length (1 to 11) as follows: 40:20:18:21:21:19:21:21:18:31:21:46.

Pronotum nearly horseshoe-shaped and convex, wider than long, wider than head, widest at about anterior two-fifths, anterior margin obliquely emarginate on each side, sides narrowed anteriorly before the widest part; anterior angles obtuse, posterior angles widely rounded; surface densely covered with umbilicate punctures, forming irregular rugae anteriorly, with impunctate, posteriorly broader midline; pubescence similar to that on head. Scutellum triangular, densely covered with black velvety pubescence.

Elytra subquadrate, not dilated posteriad, wider than long, longer and wider than pronotum; sides straight, posterior margin slightly emarginate medially; surface densely covered with umbilicate punctures, covered with dense brownish pubescence.

Abdomen elongate and gradually narrowed posteriad; surface finely and densely punctate, 3–7 th tergites with patches of yellow pubescence laterally, patches gradually decreasing in size towards apex; 8 th tergite ( Fig. 3A ) with symmetrical pubescence towards middle, posterior margin of 8 th sternite ( Fig. 3B ) slightly and shallowly excised medially, with pubescence towards middle, apex of 9 th sternite ( Fig. 3E ) slightly emarginate medially; surface bearing moderately long yellow pubescence. 10 th tergite ( Fig. 3D ) triangular, with long golden pubescence along midline.

Legs robust, with dense yellow pubescence, protarsus strongly dilated, with brownish yellow pubescence.

Aedeagus ( Figs. 3G–I ) symmetrical; with weakly sclerotized middle part and globular basal part, in ventral view, median lobe narrowed in middle, posterior part dilated towards apex; paramere slender, gradually narrowed apicad, almost half as long as median lobe; in lateral view also slightly curved ventrad, paramere large and elongate, apex with two pairs of fine setae.

Female. Unknown.

Distribution. China (Hainan).

Notes. The species differs from all other known Chinese species by the remarkably small size.

Etymology. The species is named after the type locality, Hainan Province, China.

Figures

FIGURES 3A–I. Naddia hainanensis Yang & Zhou sp. n., male (A–I, holotype). A—8th tergite; B—8th sternite; C— head; D—10th tergite; E—9th sternite; F—antennae; G—aedeagus, dorsal view; H—aedeagus, ventral view; I—aedeagus, lateral view. Scale bar 1mm.