Geodromicus, Redtenbacher, 1857

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 : 167

Key to the Geodromicus species recorded from China

1 Pronotum with the anterior angles slightly or distinctly protruded anteriad. Abdomen with tomentose spots in the middle of abdominal tergites IV and V............................................................................ 2

- Pronotum with rounded anterior angles. Abdomen with tomentose spots only in the middle of abdominal tergite IV....... 4

2 Elytra short, markedly less than twice as long as pronotum. Body reddish-brown to brown. Aedeagus as in Fig. 63. Body length 5.34–5.50 mm. Habitus as in Fig. 57 . China (Xizang)....................................... G. namucuoicus sp. n.

- Elytra longer, twice or more than twice as long as pronotum. Body brown to black................................. 3

3 Apical portion of median lobe narrow; parameres longer, extending to apex of median lobe, with small setae on inner margins (Shavrin 2019: figure 8). Body length 5.55–7.50 mm. Habitus as in Shavrin (2019: figure 2). Southern China......................................................................................... G. amplissimus Shavrin, 2019

- Apical portion of median lobe moderately wide; parameres shorter, not extending to apex of median lobe, without setae on inner margin ( Fig. 101 ). Body length 5.26–6.84 mm. Habitus as in Fig. 95 . China (Xizang)............. G. subquadratus sp. n.

4 Pronotum with very wide and deep longitudinal impression................................................... 5 - Pronotum with or without narrow longitudinal impression.................................................... 6

5 Head with postocular parts wide and arcuate. Elytra shorter, slightly more than 1.5 times as long as pronotum. Forebody black, abdomen dark-brown. Habitus as in Shavrin & Smetana (2016: figure 1). Aedeagus wider, parameres exceeding to apex of median lobe ( Shavrin & Smetana 2016: figure 12). Body length 4.50–4.75 mm. China (Taiwan) .......................................................................................... G. philydroides Shavrin & Smetana, 2016

- Head with narrower postocular part. Elytra longer, approximately twice as long as pronotum. Body reddish-brown to brown, basal third of elytra bicoloured, yellow-brown to reddish-brown. Habitus as in Shavrin & Smetana (2016: figure 2). Aedeagus narrower, parameres almost reaching apex of median lobe ( Shavrin & Smetana 2016: figures 14, 16). Body length 3.30–4.60 mm. China (Taiwan) .................................................. G. taiwanensis Shavrin & Smetana, 2016

Figures

FIGURES 57–58. Habitus of species of Geodromicus: 57–G. namucuoicus sp. n. (holotype), 58–G. paramerus (Ningxia). Scale bar: 2.0 mm.

FIGURES 97–101. Male of Geodromicus subquadratus sp. n. (paratype): 97–abdominal tergite VIII, 98–abdominal sternite VIII, 99–aedeagus, dorsal view, 100–aedeagus, lateral view, 101–aedeagus, parameral view. Scale bar: 0.2 mm.

FIGURES 95–96. Habitus of species of Geodromicus: 95–G. subquadratus sp. n. (holotype), 96–G. szechwanensis (Shaanxi). Scale bar: 2.0 mm.