Stenus cirrus L. Benick 1940
Creators: name: Tang, Liang
name: Liu, Sheng-Nan
name: Dong, Xin-Yu
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Stenus
Stenus cirrus

description: Key to species of the Stenus cirrus group of Sichuan
1 Hind legs with tarsomeres IV simple...................................................................... 2
- Hind legs with tarsomeres IV distinctly bilobed.............................................................. 3
2 Abdominal tergites without reticulation. BL= 2.6–2.8 mm, FB= 1.3 mm. Aedeagus: Fig. 5 in Puthz, 2012 ................................................................................................. S. beckeri L. Benick, 1941
- Last abdominal tergites reticulated. BL= 2.3–2.8 mm, FB= 1.2–1.3 mm. Aedeagus: Fig. 6 in Puthz, 2012 ............................................................................................... S. erlangmontium Puthz, 2012
3 Abdominal segments III and IV with paratergites............................................................ 4
- Abdominal segments III and IV without paratergites.......................................................... 5
4 Abdominal segments V and VI with paratergites. BL: 4.1–4.3 mm, FL: 2.0 mm. Habitus: Fig. 3; sexual characters: Figs. 22–27........................................................................................ S. lineatus sp. n.
- Abdominal segments V and VI without paratergites. BL: 4.2–4.6 mm, FL: 1.9–2.3 mm. Habitus: Fig. 7; sexual characters: Figs. 44–49.......................................................................... S. brevilineatus sp. n.
5 Elytra stout with EL/EW=0.75–0.76; pronotum bicolor with lateral portions distinctly lighter. BL: 4.1–4.5 mm, FL: 1.8–1.9 mm. Habitus: Fig. 6; sexual characters: Figs. 40–43.......................................... S. xichangensis sp. n.
- Elytra slender with EL/EW≥0.85; pronotum unicolor......................................................... 6
6 Head distinctly narrower than elytra, macropterous. BL= 3.3–4.5 mm, FL: 1.9–2.1 mm. Aedeagus: Fig. 4 in Puthz, 1998 .................................................................................... S. aeneonitens Puthz, 1998
- Head distinctly wider than elytra, brachypterous............................................................. 7
7 Smaller species, BL= 3.2–3.3 mm, FL= 1.5 mm; head black and rest parts reddish brown. Habitus: Fig. 5; sexual characters: Figs. 34–39......................................................................... S. jiudingshanus sp. n.
- Larger species, BL≥ 3.7mm, FL≥ 1.8 mm; body with different coloration.......................................... 8
8 Elytra with distinct spots, disk relatively even, punctation distinctly wider than apical cross section of antennal segment II. BL: 3.7–4.9 mm, FL: 1.8–2.1 mm. Habitus: Fig. 4; sexual characters: Figs. 28–33....................... S. emeishanus sp. n.
- Elytra with indistinct spots or without spots, disk uneven, punctation as wide as apical cross section of antennal segment II....................................................................................................... 9
9 Larger species; elytra broader than long. BL: 4.6–5.2 mm, FL: 2.0– 2.3 mm. Habitus: Fig. 1; sexual characters: Figs. 8–15....................................................................................... S. cariniventris sp. n.
- Smaller species; elytra at least as long as wide. BL: 4.0– 4.1 mm, FL: 1.9–2.0 mm. Fig. 2; sexual characters: Figs. 16–21........................................................................................... S. jiangrixini sp. n.
description: Published as part of Tang, Liang, Liu, Sheng-Nan & Dong, Xin-Yu, 2018, Seven new species of the Stenus cirrus group (Coleoptera, Staphylinidae) from Sichuan, Southwest China, pp. 527-540 in Zootaxa 4425 (3) on page 539, DOI: 10.11646/zootaxa.4425.3.6, http://zenodo.org/record/1270419