Gabrius invisus, Li & Schillhammer & Zhou, 2012

Li, Liang, Schillhammer, Harald & Zhou, Hong-Zhang, 2012, Taxonomy of the genus Gabrius Stephens, 1829 (Coleoptera: Staphylinidae: Philonthina) from China, with description of two new species, Journal of Natural History 46 (15 - 16), pp. 955-967 : 959-964

Gabrius invisus sp. nov.

( Figure 2A–I )

Type material

Holotype: male, China: Beijing: Xiaolongmen: Nangou, 1140–1270 m, 21–22 September 2001, leg. Yu Xiaodong (IZ-CAS). Paratypes: three males, nine females, same data as holotype (IZ-CAS); one male, CHINA: Beijing: Mentougou: Liyuanling, 13–16 May 2000, leg. Yu Xiaodong (IZ-CAS); one male, two females, Beijing: Mentougou: Liyuanling, 18–21 July 1999, leg. Luo Tianhong (IZ-CAS); one male, four females, Beijing: Badaling, 9 September 1980 [B.M.1980-491, P.M. Hammond (4 BMNH, 1 NMW); five males, six females, Bejing: Xiaolongmen, 25–29 June 1995, leg. G. de Rougemont (nine CRL, two NMW); one male, two females, Beijing: Songshan, 14 May 1993, leg. G. de Rougemont (CRL); one female, Beijing: Huangsangyu, 9 May 1995, leg. G. de Rougemont (CRL); two males, four females, China: Zhejiang: Lin’an: Qianqingtang, 1100 m, 6 August 2008, leg. Zhou Yulingzi (IZ-CAS); four males, seven females, Zhejiang: Fengyangshan, 1250–1450 m, 2–4 August 2008, leg. Zhou Yulingzi (IZ-CAS); one male, Zhejiang: Fengyangshan, 1400 m, 28–31 July 2007, leg. Zhao Zongyi (IZ-CAS); one female, Lin’an Co., W Tinamu Shan N.R., 300 m, 22 May 1996, leg. J. Cooter, Cryptomeria, Liriodendron dominant forest, Leaf litter, Winkler extractor (CRL); five males, Zhejiang: Tienmushan, 29 April 1993, leg. G. de Rougemont (CRL); 11 males, seven females, Zhejiang: Tienmushan, 2 September 1994, leg. G. de Rougemont (16 CRL, 2 NMW); eight males, 12 females, Anji Co., Longwangshan N.R., ca. 400 m, 14 May 1996, leg. J. Cooter, flight intercetion trap (18 CRL, 2 NMW); three females, China: Shaanxi: ca. 20 mi. S Xi’an, Nan Wutai, 19 September 1980 [B.M.1980–491, P.M. Hammond (BMNH); one male, Shaanxi: Qinlingshan above Houzhenzi, 115 km WSW Xi’an (33 ◦ 47 ′ N, 107 ◦ 47 ′ E), 1450 m, 5 July 2001, leg. A. Smetana [C95b] (CSO); one male. Shaanxi: Qinlingshan, pass on road Zhouzhi-Foping, 105 km SW Xi’an, N-slope, (33 ◦ 44 ′ N, 107 ◦ 59 ′ E), 1990 m, small creek valley, mixed dec. forest, bamboo, small meadows, 2–4 July 2001, leg. D. Wrase [01] (CSB); one female, Shaanxi: Qinlingshan, pass on road Zhouzhi-Foping, 105 km SW Xi’an, N-slope (33 ◦ 46 ′ N, 107 ◦ 58 ′ E), 1990 m, 3 July 2001, leg. M. Schülke [C01-02], small creek valley, mixed dec. forest, moss, sifted (CSB); three males, two females, Shaanxi: Nan Wutai, 17 September 1995, leg. G. de Rougemont (4 CRL, 1 NMW); one female, Shaanxi: Qinlingshan (34 ◦ 00 ′ N 108 ◦ 30 ′ E), riv. vall. 30 km SSW Xi’an, autoroute 33 km, env. source, 600 m, 31 August 1995, leg. D. Wrase (CSB); one female, Shaanxi: Qinlingshan (34 ◦ 00 ′ N 108 ◦ 30 ′ E), riv. vall. 30 km SSW Xi’an, autoroute 33 km, 600 m, sifted, 31 August 1995, leg. M. Schülke (CSB); one female, Shaanxi: Qinlingshan (34 ◦ 00 ′ N 108 ◦ 30 ′ E), riv. vall. 30 km SSW Xi’an, autoroute 33 km, 600 m, sifted, 31 August 1995, leg. A. Pütz (CSB); four males, one female, Shaanxi: Huashan, N-valley, 118 km E Xi’an, 1200–1400 m, sifted, 18 / 20 August 1995, leg. M. Schülke (4 CSB, 1 NMW); one male, two females, Shaanxi: Huashan, N-valley, 118 km E Xi’an, 1200–1400 m, sifted, 18–20 August 1995, leg. A. Pütz (2 CSB, 1 NMW); two males, two females, border Shaanxi-Sichuan, Dabashan, pass 20 km SSE Zhenping, 1700–1800 m (31 ◦ 44 ′ N, 109 ◦ 35 ′ E), 9 July 2001, leg. A. Smetana [C96a] (3 CSO, 1 NMW); two males, 11 females, same but [C96b] (12 CSO, 1 NMW); four males, two females, same but 12 July 2001, [C101] (5 CSO, 1 NMW); 23 males, 20 females, border Shaanxi-Sichuan, Dabashan, pass 20 km SSE Zhenping, 1700–1800 m (31 ◦ 44 ′ N, 109 ◦ 35 ′ E), 12 July 2001, leg. M. Schülke [C01-07C], mixed forest, small creek valley, moss, bark, sifted (38 CSB, 5 NMW); eight males, 10 females, border Shaanxi-Sichuan, Dabashan, pass 20 km SSE Zhenping, 1700–1800 m (31 ◦ 44 ′ N, 109 ◦ 35 ′ E), 9–12 July 2001, small creek valley, young mixed forest, leaf litter, moss, leg. D. Wrase [07] (16 CSB, 2 NMW); two males, four females: China: Hubei: Dabashan, pass E Mt. Dashennongjia, 12 km NW Muyuping (31 ◦ 30 ′ N, 110 ◦ 21 ′ E), 1950 m, 19 July 2001, leg. A. Smetana [C111] (CSO); one male, one female, Hubei: Dabashan, pass E Mt. Dashennongjia, 12 km NW Muyuping (31 ◦ 30 ′ N, 110 ◦ 21 ′ E), 2050 m, 19 July 2001, leg. A. Smetana [C112] (CSO); one male, two females, Hubei: Dabashan, pass E Mt. Dashennongjia, 12 km NW Muyuping (31 ◦ 30 ′ N, 110 ◦ 21 ′ E), 1950 m, 16 July 2001, leg. M. Schülke [C01-13], dry creek valley, mixed deciduous forest, dead wood, mushrooms, sifted (CSB); one male, two females, Hubei: Dabashan, pass E Mt. Dashennongjia, 12 km NW Muyuping (31 ◦ 30 ′ N, 110 ◦ 21 ′ E), 1950–2050 m, 19 July 2001, leg. M. Schülke [C01-13C], creek valley, mixed deciduous forest, dead wood, mushrooms, sifted (CSB); one male, four females, Hubei: Dabashan, pass E Mt. Dashennongjia, 12 km NW Muyuping (31 ◦ 30 ′ N, 110 ◦ 21 ′ E), 1950–2050 m, 22 July 2001, leg. M. Schülke [C01-13E], dry creek valley, mixed deciduous forest, dead wood, mushrooms, sifted (CSB); three males, three females, Hubei; Dabashan, creek valley 8 km NW Muyuping (31 ◦ 29 ′ N, 110 ◦ 22 ′ E), 1550–1650 m, 18 July 2001, leg. A. Smetana [C115b] (5 CSO, 1 NMW); one male, Hubei: Dabashan, creek valley 8 km NW Muyuping (31 ◦ 29 ′ N, 110 ◦ 22 ′ E), 1550–1650 m, 18 July 2001, leg. M. Schülke [C01-16A], deciduous forest, moss, sifted (CSB); 13 males, three females, Hubei: Dabashan, crk. valley 4 km N Muyuping, 1700 m, 21 July 2001, leg. A. Smetana [C116] (13 CSO, 3 NMW); one male, Hubei: Dalaoshan forest park, 9–15 June 2004, pitfall traps, leg. J. Turna (NMW); three males, two females, Henan: N-Henan, Wangwushan (35 ◦ 11 ′ N, 112 ◦ 16 ′ E), 1175 m, 13 June 2007, leg. J. Turna (NMW); one male, China: Hunan: Wulingyuan, N Dayong, Zhangjiajie, 650 m, 29 October 1993, leg. H. Schillhammer [CWBS 1] (NMW); two males, China: Sichuan: Emeishan, 28–29 August 2005, leg. Zhang Yejun (IZ-CAS); one male, Sichuan: Jiulong, 2130 m, 9–12 July 2001, leg. Yu Xiaodong (IZ-CAS); one male, Sichuan: Ebian, Lawu Xiang, Xiaoliang Shan, 1820 m, 7 October 1997, leg. Toshio Kishimoto (CTK); five males, one female, Sichuan: Chengkou, Gaonan, Hojiawan, 1250 m, 26 September 1997, leg. Toshio Kishimoto (CTK); one female, W-Sichuan: Ya’an Pref., Tianquan Co., Jiajin Shan, Vall. above Labahe N.R. St., 57 km W Ya’an (30 ◦ 06 ′ N 102 ◦ 25 ′ E), litter bark, fungi, 1800 m, 12 July 1999, leg. M. Schülke (CSB).

Description

Head and pronotum black, shining. Antennae black with basal three segments reddish brown. Elytra and scutellum dark brown. Abdomen black with posterior margin of tergites III–VII narrowly reddish brown. Mandibles, maxillary and labial palpi and legs reddish brown.

Body 5.88–6.53 mm long (HPL = 1.72–1.96 mm). Head of rounded quadrangular shape, 0.82–0.90 mm long, 0.65–0.73 mm wide (HW:HL = 0.80–0.82). Tempora 0.33–0.41 mm long, almost evenly rounded, sparsely and coarsely punctate; eyes moderately large, slightly protruding, 0.25 mm long, 0.60–0.75 times as long as tempora. Dorsal surface of head with scattered, large setiferous punctures along lateral sides, vertex largely impunctate; entire head with distinct and profound microsculpture of transverse waves. Antennae short, first segment long, slightly thickened towards apex, third segment distinctly longer than second, fourth–sixth segments almost as long as wide, seventh–10th segments distinctly transverse, last segment longer than wide, obliquely truncated.

Pronotum slightly narrowed anteriad, 0.90–1.06 mm long, 0.82 mm wide, slightly wider than head (PW:HW = 1.11–1.25); dorsal rows each with 6–7 punctures, sublateral rows each with two punctures; microsculpture similar to that on head.

Elytra 1.06–1.22 mm long, 1.06–1.22 mm wide, along sides 1.08–1.25 times as long as pronotum, densely and finely punctate, punctures separated by 2–3 times their diameter. Scutellum large, triangular, densely and finely punctate.

Abdomen slightly narrowed posteriad, widest 0.98–1.14 mm, densely and finely punctate, punctures separated by 1–2 puncture diameters at base, gradually becoming sparser toward apex of each tergite; surface between punctures with exceedingly fine and dense microsculpture of transverse striae; tergites III–V with two basal lines, elevated area between basal lines almost impunctate.

Male. Tergite VIII with apical margin distinctly produced medioapically ( Figure 2F ). Sternite VIII with wide and shallow medioapical emargination filled by dense and long apical setae laterally, similar to that of G. kambaitiensis Scheerpeltz. Sternite IX largely membranous at middle portion, basal portion narrow and long, almost symmetrical; apical piece very short, shortly and sparsely setose ( Figure 2D ). Tergite X simple, triangular, with apex subtruncated, bearing two long apical setae ( Figure 2G ).

Aedeagus large; median lobe long, distinctly exceeding paramere, apical portion narrowed into subacuate apex ( Figure 2A ); in lateral view, median lobe with a small subapical dorso-lateral extension ( Figure 2B ); paramere with apical margin shallowly and widely emarginated, with four strong medial setae, face adjacent to median lobe with sensory peg setae arranged closely at apical margin, but sparing out middle, where stout medial setae situated. ( Figure 2C ).

Female. Tergite VIII with apical margin slightly produced medio-apically ( Figure 2H ). Sternite VIII subrounded at apex, without medio-apical emargination ( Figure 2I ). Tergite X triangular, with inconspicuously emarginate apex, bearing two long apical setae ( Figure 2E ).

Etymology

The specific epithet invisus (Latin: unseen) refers to the fact that initially the species was erroneously mistaken for Gabrius kambaitiensis .

Distribution

The species is widely distributed in China (Beijing, Zhejiang, Shaanxi, Hubei, Hunan, Henan, Sichuan) .

Remarks

In this group, the new species is closely related to Gabrius kambaitiensis Scheerpeltz, 1965 and G. eminens Schillhammer, 2001 . Gabrius invisus sp. nov. can be easily distinguished from G. kambaitiensis by distinctly acute apex of median lobe of aedeagus. The new species differs from G. eminens by middle portion of apical margin of paramere without sensory peg setae and distinctly narrower apical portion of median lobe of aedeagus in lateral view.

Gabrius cinctiventris Scheerpeltz, 1965 ; first record from China Scheerpeltz 1965, p. 229 (type locality: Kambaiti).

Schillhammer 1997, p. 52 (characters, Myanmar).

Herman 2001, p. 2617 (world catalogue).

Examined material

Four males, four females, China: Yunnan: Nujiang Lisu Aut. P., Gongshan Co., Gaoligongshan , creek valley 17 km N Gongshan (27 ◦ 45 ′ N, 98 ◦ 35 ′ E), 2500 m, 21 June 2005, leg. M. Schülke [C2005-12], litter and debris around snow field, sifted during rain (6 CSB, 2 NMW); one male, one female, Yunnan: Dali: Cangshan, 2085–2200 m, 30 July 2006, leg. Li Xiaoyan ( IZ-CAS) .

Distribution

China (Yunnan), Myanmar.

Gabrius kambaitiensis Scheerpeltz, 1965 ; first record from China Scheerpeltz 1965, p. 228 (type locality: Kambaiti).

Schillhammer 1997, p. 54 (characters, Myanmar).

Herman 2001, p.: 2629 (world catalogue).

Examined material

Two males, China: Yunnan: Nujiang Lisu Aut. P., Gongshan Co., Gaoligongshan , creek valley 17 km N Gongshan (27 ◦ 45 ′ N, 98 ◦ 35 ′ E), 2500 m, 21 June 2005, leg. M. Schülke [C2005-12A], litter and debris around snow field ( CSB, NMW) .

Distribution

China (Yunnan), Myanmar.

Figures

Figure 2. Gabrius invisus sp. nov. (A) aedeagus, ventral view; (B) median lobe of aedeagus (paramere removed), lateral view; (C) underside of paramere; (D) sternite IX of male; (E) tergite X of female; (F) tergite VIII of male; (G) tergite X of male; (H) tergite VIII of female; (I) sternite VIII of female. Scale bars 0.5 mm.