Omoglymmius (s. str.) wukong, Wang, Cheng-Bin, Ruzicka, Jan & Liu, Bin, 2017

Wang, Cheng-Bin, Ruzicka, Jan & Liu, Bin, 2017, Omoglymmius (s. str.) wukong sp. n., a new species from Xizang, China (Coleoptera, Rhysodidae, Omoglymmiini), ZooKeys 706, pp. 95-107 : 97-102

Omoglymmius (s. str.) wukong sp. n. Figs 2, 3, 4, 5, 6 D–F

Material examined.

Holotype: ♂, CHINA: Xizang, / Chayu County, / Shangchayu Town [上察隅镇], / 16.VIII.2015, / Lu Qiu leg. (NMPC). Paratypes: 6♂♂2♀♀, same data as holotype (2♂♂ in BITS, 2♂♂1♀ in COHP, 1♂ in NHMB, 1♂ in NMEG and 1♀ in NMPC); 3♂♂1♀, same data as holotype except: 2000 m, fallen wood, / 24.VIII.2005 (BITS); 1♀, same data as holotype except: 2000 m, Populus stump, / 24.VIII.2005 (BITS).

Diagnosis.

Head with orbital groove extended before or near the middle of eye, following 1-2 separate coarse dorsal punctures far away from posterior margin of temporal lobe (Figs 2A, C; red arrow in 3A). Pronotal sides gently curved (Figs 2A, C; 3E); (pronotal length)/(pronotal width) = 1.1-1.2 (Figs 2A, C; 3E); outer carina with a distinct oblique microgroove at about basal 1/4 of medial margin (Figs 2A, C; 3E); inner carina impunctate, gradually narrowed in apical part, and weakly undulated at medial margin (Figs 2A, C; 3E); median groove much narrowed in middle part (Figs 2A, C; 3E); marginal groove narrower (Figs 2A, C; 3E); propleuron smooth, almost impunctate except sporadic coarse punctures near margins (Fig. 2B, D); prosternum with sparse coarse punctures and distinct precoxal carinae (Fig. 2B, D). Elytra with stria punctures relatively small (Figs 2A, C; 3F); stria IV with one seta at about basal 2/9, one seta at about apical 2/7 of its length and one seta subapically (Fig. 2A, C). Metasternum with only a few coarse punctures sparsely located along the midline; more coarse punctures closely arranged almost into a row near lateral margins; remainder of disc smooth; a shallow median pit present posteriorly (Figs 2B, D; 3G). Aedeagus with right paramere simply curved at outer margin and expanded in apical part (Fig. 6E). Female profemur without tooth on ventral side (Fig. 2D).

Description.

Male. Medium size, body 6.5-7.0 mm long (6.7 mm in holotype). Length (mm) of different body parts: head (1.0-1.1), pronotum (1.5-1.7), antenna (1.7-1.8), elytra (3.8-4.1); width (mm): head (0.9-1.0), pronotum (1.2-1.3), elytra (1.5-1.6).

Habitus (Fig. 2 A–B) elongate, rather narrow, lustrous. Body colour mostly blackish brown to black; antennae and legs somewhat reddish brown; mouthparts reddish brown to yellowish brown.

Head (Fig. 3 A–C) broad, as wide as long. Median lobe short, broad, subtruncate at tip. Frontal space short, nearly V-shaped, margins only shallowly sinuate. Temporal lobes longer than wide; medial angles rounded, contiguous; posteriomedial margin evenly rounded into posteriolateral margin; occipital angle scarcely evident; orbital groove impressed, extended before or near the middle of eye, following one or two separate coarse dorsal punctures far away from posterior margin of temporal lobe (red arrow in Fig. 3A); remainder of temporal lobe smooth except micropunctures; temporal setae absent; postorbital tubercle minute, not pilose, appearing as a slight convexity in lateral view. Eye entire, curvilinearly triangular, length/width = 1.1. Mentum surface coarsely and continuously punctate, with many setae. Antenna (Fig. 3D) without stylet; antennomeres V–X with minor setae in form of subapical rings; basal setae absent; all antennomeres impunctate.

Pronotum (Fig. 3E) subelliptical, distinctly narrowed anteriorly and posteriorly, widest at about basal 4/9, length/width = 1.1-1.2. Sides gently curved, hardly sinuate before hind angle; hind angles broadly rounded. Carinae subequal at middle; outer carina with base distinctly narrowed, with medial margin sinuate before base and with a distinct oblique microgroove at about basal 1/4 of its length; inner carina distinctly narrowed in basal part, gradually narrowed in apical part, and weakly undulated at medial margin; both pairs of carinae impunctate except micropunctures. Median and paramedian grooves narrow; median groove much narrower in middle part, opening both anteriorly and posteriorly. Pronotal setae absent. Pronotal hypomeron with many small punctures. Propleuron smooth, almost impunctate except sporadic coarse punctures near margins. Prosternum with sparse coarse punctures; precoxal carinae distinct, sinuate.

Elytra (Figs 2A; 3F) elongate, narrow, length/width = 2.2-2.3. Striae impressed, coarsely punctate, punctures relatively small and deep; intervals only slightly convex; stria IV with one seta at about basal 2/9, one seta at about apical 2/7 of its length and one seta subapically; subapical striole with one seta; stria VII with four setae near apex (some specimens with one seta behind the insertion level of hind leg). Metathoracic wings fully developed.

Protibia (Fig. 4A) nearly cylindrical, not swollen at middle; profemur with a large and somewhat rounded tooth at medial position of ventral side. Mesotibia (Fig. 4A) with one curved spur and one minute calcar. Metatibia (Fig. 4C) with one straight spur and one calcar small, subtriangular, obtusely rounded at apex.

Ventral surfaces of pterothorax and abdomen (Figs 2A; 3G) obviously much smoother than in the related Omoglymmius (s. str.) sakuraii and O. (s. str.) laticeps . Metaster num with only a few coarse punctures sparsely located along the midline; more coarse punctures closely arranged almost into a row near lateral margins; remainder of disc smooth; a shallow median pit present posteriorly. Each abdominal sternum with coarse punctures arranged into two or three irregular transverse rows; sternum IV with deep, round lateral pits; sternum V without visible pits; sternum VI with two setae near apical margin.

Genital ring (Fig. 5E) subquadrate, with long handle, nearly parallel-sided, and rounded at tip.

Aedeagus (Fig. 5 A–C) with median lobe thick, tubular; opening of apical orifice (Fig. 5D) large, subelliptical; left paramere (Fig. 6D) broad, subelliptical; right paramere (Fig. 6E) small, simply curved at outer margin, expanded in apical part. Endophallus as shown in Fig. 6F.

Female. Similar to male in general appearance, but distinguished by the following characteristics (Fig. 2 C–D): mentum surface with fewer setae, less coarsely punctate; profemur without tooth on ventral side; meso- and metatibiae without calcars; abdominal sternum IV with lateral pits distinctly larger.

Etymology. The specific epithet is from the name of "Sun Wukong", also known as the Monkey King, a mythological figure who features in a body of legends, which can be traced back to the period of the Song dynasty.

Distribution. China (Xizang) (Fig. 7).

Remarks. This new species is probably closely allied to the two known species of the subgenus Omoglymmius from East Asia, O. (s. str.) sakuraii (Nakane) and O. (s. str.) laticeps Bell. They resemble each other in general appearance, but detailed comparison of selected morphological characters of importance show their differences (Table 1).