Rugilus (Rugilus) reticulatus, Assing, 2012

Assing, Volker, 2019, A revision of Palaearctic and Oriental Rugilus. VI. Two new species Irom China, a new synonymy, and additional records (Coleoptera, Staphylinidae, Paederinae), Linzer biologische Beiträge 51 (1), pp. 5-20 : 12-13

Rugilus (Rugilus) reticulatus ASSING, 2012

M a t e r i a l e x a m i n e d: China: 1♀, Shaanxi,QinlingShan, 34°01'N, 107°52'E, 1700-2200 m, sifted, 17.V.2011, leg. Grebennikov (cSme).

C o m m e n t: The above female was collected together with the material of R. reticulatus recorded by ASSING (2015). In all, 71 specimens of this wing-dimorphic species have been studied so far, 16 (22.5 %) of which are males.

Rugilus (Rugilus) reuteri nov.sp. ( Figs 13-15 , 21 ) T y p e m a t e r i a l: Holotype ♂: ̎ China, N-Sichuan, Huanglong Shan , 2611 m, Sanluogou

vill., 32°46'50''N, 103°55'25''E, 15-17.VI.2018, leg. Reuter / Holotypus ♂ Rugilus reuteri sp. n., det. V. Assing 2018̎ (cAss). Paratypes: 1♂, 3♀♀: same data as holotype (cFel, cAss).

E t y m o l o g y: This species is dedicated to Christoph Reuter (Hamburg), who collected the type series.

D e s c r i p t i o n: Body length 4.9-5.8 mm; length of forebody 2.9-3.0 (♂♂) and 2.8- 3.2 mm (♀♀). Habitus as in Figs 13-14 . Coloration: body blackish; elytra with weak metallic hue; legs and antennae reddish.

Head approximately 1.05 times as broad as long, broadest across eyes; lateral margins behind eyes convering towards posterior constriction in almost straight line in dorsal view, posterior angles obsolete; punctation moderately coarse, very dense, areolate, and partly confluent. Eyes large and bulging, as long as distance from posterior margin of eyes to posterior constriction, or nearly so. Anterior margin of labrum with two teeth on either side of the median incision.

Pronotum small in relation to head, approximately 1.25 times as long as broad and 0.65 times as wide as head; midline with more or less distinct glossy longitudinal patch in posterior portion; punctation similar to that of head.

Elytra and hind wings sexually dimorphic ( Figs 13-14 ); punctures dense, moderately coarse, and of variable size; interstices without microsculpture. Metatarsomere I approximately as long as the combined length of II and III.

Abdomen: tergites III-VI with moderately pronounced impressions anteriorly, these impressions with coarse, dense and irregular punctation; punctation of remaining tergal surfaces fine and dense; interstices on tergites III-VI with extremely shallow microsculpture visible only at high magnification (100 x), on tergite VII with slightly more distinct microreticulation; posterior margin of tergite VII with fully developed (♂♂) or rudimentary (♀♀) palisade fringe.

♂: elytra long ( Fig. 13 ), approximately 1.15 times as long as pronotum; hind wings fully developed; sternite VII not distinctly modified; sternite VIII with moderately deep and rather broad posterior excision; aedeagus 0.55-0.58 mm long and shaped as in Fig. 15 .

♀: elytra ( Fig. 14 ) short, 0.84-0.94 times as long as pronotum; hind wings reduced.

C o m p a r a t i v e n o t e s: Based on the similar external (including the sexual wing dimorphism) and male sexual characters, R. reuteri is closely allied to R. gansuensis ROUGEMONT, 1998 (Gansu, Shaanxi), R. daxuensis ASSING, 2012 (Sichuan), and R. emeimontis ASSING, 2015 (Sichuan). It is externally identical to R. daxuensis and additionally distinguished from the other two species as follows:

from R. gansuensis by smaller body size, smaller and shorter male elytra, paler legs, and a less deep and broader posterior excision of the male sternite VIII;

from R. emeimontis by smaller body size, smaller and shorter male elytra, paler legs, a smaller and narrower pronotum with a less pronounced median glossy band on the pronotum, denser and more distinct punctation of the abdomen, and a less deep and broader posterior excision of the male sternite VIII.

For illustrations of R. gansuensis , R. daxuensis , and R. emeimontis see ASSING (2012a, 2015).

D i s t r i b u t i o n a n d n a t u r a l h i s t o r y: The type locality ( Fig. 21 ) is situated in the Huanglong Shan, North Sichuan, China. The specimens were collected with pitfall traps in a shady moist forest at the foot of a rock wall at an altitude of approximately 2610 m (REUTER pers. comm.).

Rugilus (Rugilus) gonggaicus ASSING, 2012 M a t e r i a l e x a m i n e d: China: 1♂, 6♀♀, Sichuan, Gongga Shan, 29°52'N, 102°02'E,

3620 m, sifted, 12.VI.2011, leg. Grebennikov (CAS, cSme, cAss).

C o m m e n t: This species is endemic to the Gongga Shan. Only eleven (10.5 %) in a total of 105 specimens studied thus far are males ( ASSING 2012a, 2015).

Figures

Figs 13-18: Rugilus reuteri (13-15) and R. gryps (16-18): (13) male habitus; (14) female habitus; (15, 17-18) aedeagus in lateral and in ventral view; (16) forebody. Scale bars: 13-14, 16: 1.0 mm; 15, 17-18: 0.2 mm.

Fig. 21: Type locality of Rugilus reuteri. Foto: Christoph Reuter.