Geodromicus shii Cheng & Peng, 2020

Cheng, Zhi-Fei, Shavrin, Alexey V. & Peng, Zhong, 2020, New species and records of Geodromicus Redtenbacher, 1857 from China (Coleoptera: Staphylinidae: Omaliinae: Anthophagini), Zootaxa 4789 (1), pp. 132-170 : 156-159

Geodromicus shii Cheng & Peng sp. n.

( Figs. 81 , 83–89 , 113 )

Type material examined: Holotype ♂: ‘ China: Neimenggu A. R., | Kalaqinqi [Ṛůèû], | Jinshan Town [ ŔƜ Ř], | 1.vi.2006, | Hong-Liang Shi leg.’ <white rectangular label, printed>, ‘ HOLOTYPE | Geodromicus | shii sp. n. | Cheng & Peng des. 2019’ <red rectangular label, printed ( SNUC).

Paratypes (9 ♂♂, 11♀♀): 7 ♂♂ [five specimens dissected], 11 ♀♀: same data as the holotype ( SNUC); 1 ♂: ‘ China: Shanxi Prov., Ningwu County [ŤȄƃ], Luyashan [ḌṞƜ], Bingkouwa [ÝDṯ], 02.ix.2011, 1,930 –2,000 m a.s.l., Zhong Peng leg.’ <white rectangular label, printed> ( SNUC); 1 ♂: ‘ China: Ningxia A. R., Guyuan City [Ḏ āhv], Jingyuan County [ẼḒƃ], Huanghua Town [ỠÈş], Qiuqianjia [IJTã], 1,800 m a.s.l., 6.vii.2008, Wen- Xuan Bi leg.’ <white rectangular label, printed> ( SNUC). All paratypes with additional red rectangular printed la- bel: ‘ PARATYPE | Geodromicus | shii sp. n. | Cheng & Peng des. 2019’ <red rectangular label, printed> ( SNUC).

Description. Measurements (min-max; n=21): HW: 0.86–0.95; HL: 0.56–0.67; OL: 0.29–0.35; LT: 0.12–0.14; AL (holotype): 2.49; PL: 0.83–0.89; PWmax: 0.92–1.03; PWmin: 0.70–0.78; ESL: 1.39–1.56; EW: 1.50–1.67; MTbL (holotype): 1.11; MTrL (holotype): 0.51 (MTrL 1–4: 0.26; MTrL 5: 0.25); AW: 1.43–1.83; AedL: 0.82–0.97; BL: 4.28–5.56.

Body brown to reddish-brown, with slightly darker head and pronotum; posterior portion of pronotum, mediobasal and sutural portions of each elytron, and paratergites yellow-brown; mouthparts, antennae and legs yellow to reddish-brown. Body glossy, without microsculpture, except for neck with distinct isodiametric microreticulation and abdomen with fine transverse meshes. Habitus as in Fig. 81 .

Head 1.4–1.5 times as wide as long, distinctly convex in middle and infraorbital ridges, frontal portion with moderately deep and wide anteromedian depression; temples long, slightly less than twice shorter than eyes; interocellar depression deep and wide, separated from infraorbital ridges by slightly convergent latero-anteriad, moderately deep grooves in front of ocelli. Eyes large, strongly convex. Ocelli large, distance between ocelli about 1.5 times as long as distance between ocellus and posterior margin of eye. Punctation sparse, moderately large and deep, slightly denser on infraorbital ridges. Neck without distinct pucntation. Preapical segment of maxillary palp about as long as preceding segment, slightly widened apicad; apical palpomere slightly shorter than preapical segment, widest in middle portion, gradually narrowing apically. Antennae long, exceeding apical fourth of elytra when reclined; lengths × widths of antennomeres (holotype): 1: 0.29 × 0.11; 2: 0.17 × 0.08; 3: 0.23 × 0.08; 4: 0.19 × 0.08; 5: 0.21 × 0.08; 6–9: 0.22 × 0.09; 10: 0.21 × 0.09; 11: 0.34 × 0.09.

Pronotum subcordate, convex, 1.1 times as wide as long, slightly wider than head, widest in anterior third, more narrowed posteriad than anteriad; narrowest basal part parallel-sided and moderately long, not concaved on lateral margins; anterior margin rounded; posterior margin straight; middle portion with distinct, moderately deep, oval depression in mediobasal third. Punctation finer and denser than that head, evenly distributed.

Scutellum without punctures.

Elytra convex, slightly wider than long, 1.6–1.7 times as long as pronotum, slightly widened posteriad; hind margins straight. Punctation distinctly denser, larger and deeper than that on pronotum, smaller in basal and prescutellar portions, rather smooth in apical portion.

Metatarsi more than half as long as metatibia; apical metatarsomere about as the combined length of preceding four tarsomeres.

Abdomen about as wide as elytra, with two large, transverse tomentose spots in the middle of abdominal tergite IV. Punctation with dense and fine punctation.

Male. Protarsomeres 1–4 markedly wide. Apical margin of abdominal tergite VIII ( Fig. 83 ) somewhat straight. Apical margin of abdominal sternite VIII ( Fig. 84 ) sinuate. Aedeagus ( Figs. 85, 87–89 ) with moderately wide median lobe, sharply narrowed before middle towards lancet-shaped apex; parameres long, but not exceeding apex of median lobe, slightly widened apically, each bearing three long and one short apical setae; internal sac with wide and long parallel structures, convergent in middle portion and with short and moderately wide flagellum between them. Lateral aspect of aedeagus as in Fig. 88 .

Female. Protarsomeres 1–4 narrow.Apical margins of abdominal tergite VIII and sternite VIII straight or slightly rounded.

Comparative notes. Based on the structure of the internal sac, G. shii sp. n. belongs to the plagiatus group ( Bordoni 1984). Regarding the body size, punctation of the forebody, shape of the elytra, and the general shape of the aedeagus, it similar to G. sprius Watanabe, 1990 from the Central Honshu ( Japan), from which it differs by the paler coloration with less contrasting pale spots in the anterior portion of the elytra, longer antennomeres 3–10, a less transverse pronotum, the laterally not concave apical portion of the median lobe, slightly longer parameres, and the different structure of the internal sac.

Distribution. The species is known from several localities in Neimenggu Autonomous Region, Shanxi and Ningxia Autonomous Region, China ( Fig. 113 ).

Bionomics. The specimens were collected at elevations from 1800 to 2000 m a.s.l. by sifting mixed leaf litter near small streams.

Etymology. The species is named in honour of our colleague Hong-Liang Shi (Beijing, China), one of the collectors of the type specimens.

Figures

FIGURE 113. Distribution of 21 species of Geodromicus in China: 1–G. abdominalis, 2–G. amplissimus, 3–G. aokii, 4–G. beibienkoi, 5–G. chinensis, 6–G. cupreostigma, 7–G. formosanus, 8–G. frigidus, 9–G. hammondi, 10–G. lestevoides, 11–G. magnus sp. n., 12–G. namucuoicus sp. n., 13–G. ohkurai, 14–G. philydroides, 15–G. shii sp. n., 16–G. sibiricus, 17–G. sinuatocollis, 18–G. sinuatus, 19–G. smetanai, 20–G. subquadratus sp. n., 21–G. taiwanensis.

FIGURES 81–82. Habitus of species of Geodromicus: 81–G. shii sp. n. (holotype, Neimengu), 82–G. sibiricus (Anhui). Scale bar: 2.0 mm.

FIGURES 83–87. Male of Geodromicus shii sp. n. (paratype, Ningxia): 83–abdominal tergite VIII, 84–abdominal sternite VIII, 85–aedeagus, dorsal view, 86–aedeagus, lateral view, 87–aedeagus, parameral view. Scale bar: 0.2 mm.

FIGURES 88–89. Aedeagus (parameral view) of paratypes of Geodromicus shii sp. n.: 88–Neimenggu, 89–Shanxi. Scale bar: 0.2 mm.