Stenus aureolus, Fauvel, 1875

Shuai, Qi, Tang, Liang & Luo, Yong-Ting, 2020, A review of the Stenus aureolus group of China (Coleoptera: Staphylinidae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 60 (2), pp. 615-627 : 626-627

publication ID	https://doi.org/ 10.37520/aemnp.2020.043
publication LSID	lsid:zoobank.org:pub:33D1CD77-7BC6-4083-8FD7-8F7DDAE309A6
DOI	https://doi.org/10.5281/zenodo.5188900
persistent identifier	https://treatment.plazi.org/id/03E34929-645B-FF94-DB27-FF30FD189092
treatment provided by	Carolina
scientific name	Stenus aureolus
status

Treatment

Key to species of the Stenus aureolus View in CoL group from China

1 Abdominal tergite VII with apical membranous fringe; elytra longer with EL/EW = 0.90–1.09, macropterous or brachypterous species. .............................................. 2

– Abdominal tergite VII without apical membranous fringe; elytra shorter with EL/EW = 0.77–0.88, brachypterous species. ......................................................... 5

2 Relatively smaller species with FL = 1.8–2.3 mm; hind tarsi with segments IV shortly but distinctly bilobed; elytra shorter with EL/EW = 0.90–1.02. The species should be best identified by examining male and female genitalia. ........................................................................................ 3

– Relatively larger species with FL = 2.3–2.6 mm; hind tarsi with segments IV indistinctly emarginated on apical margin; elytra longer with EL/EW = 1.02–1.09. Habitus: Fig. 3 View Figs 1–5 ; aedeagus: Fig. 19 View Figs 19–26 ; spermatheca unknown. Yunnan, Qinghai. ............................................ ...................................... S. musicola Cameron, 1930 View in CoL

3 Apical sclerotized area of aedeagal median lobe relatively longer ( Figs 15 View Figs 11–18 , 38 View Figs 34–41 ); spermatheca tube very coiled at the first bend ( Figs 18 View Figs 11–18 , 41 View Figs 34–41 ). ........................................ 4

– Apical sclerotized area of aedeagal median lobe relatively shorter; spermatheca tube simple at first bend. BL: 3.5–4.2 mm. Habitus: Fig. 1 View Figs 1–5 ; sexual characters: Figs 11–14 View Figs 11–18 . Heilongjiang, Jilin, Neimenggu. .......................... ............................................... S. aureolus Fauvel, 1875 View in CoL

4 HW/EW = 0.83–0.96; apical sclerotized area of aedeagal median lobe relatively broader and shorter; hind wings longer, 1.88–3.19 times as long as elytra. BL: 3.4– 4.5 mm. Habitus: Fig. 2 View Figs 1–5 ; sexual characters: Figs 15–18 View Figs 11–18 . Sichuan, Yunnan, Ningxia, Shaanxi, Qinghai. ............... ....................................... S. trigonuroides Zheng, 1993 View in CoL

– HW/EW = 0.91–0.98; apical sclerotized area of aedeagal median lobe relatively narrower and longer; hind wings shorter, slightly longer than half the elytra. BL: 3.8–4.5 mm. Habitus: Fig. 9 View Figs 6–10 ; sexual characters: Figs 38–41 View Figs 34–41 . Yunnan. ............. S. paratrigonuroides View in CoL sp. nov.

5 Head and pronotum with interstices distinctly reticulated. Habitus: Fig. 4 View Figs 1–5 ; sexual characters: Figs 22 View Figs 19–26 . Xinjiang. .................................. S. nigraureolus Ryvkin, 2003 View in CoL

– Head and pronotum with interstices smooth or at most indistinctly and partially reticulated. ........................... 6

6 Smaller species with FL: 1.6–1.7 mm; hind tarsi with segments IV indistinctly emarginated on apical margin. BL: 3.5–3.7 mm. Habitus: Fig. 5 View Figs 1–5 ; sexual characters: Figs 23–26 View Figs 19–26 . Qinghai. ................ S. mendaensis View in CoL sp. nov.

– Larger species with FL: 1.8–2.4 mm; hind tarsi with segments IV shortly but distinctly bilobed. The species should be identified by genitalia dissections. .............. 7

7 Apical sclerotized area of aedeagal median lobe short, expulsion clasps ( Fig. 28 View Figs 27–33 ) less protruded inwards medially. Habitus: Fig. 6 View Figs 6–10 ; sexual characters: Figs 27–29 View Figs 27–33 . Sichuan. ............................................ S. aduncus View in CoL sp. nov.

– Apical sclerotized area of aedeagal median lobe long, expulsion clasps more protruded inwards medially ( Fig. 30 View Figs 27–33 ). ........................................................................... 8

8 Aedeagus with expulsion clasps stout; spermatheca ( Fig. 33 View Figs 27–33 ) with basal porch less emarginated on apical margin, and spermatheca duct slender. Habitus: Fig. 7 View Figs 6–10 ; sexual characters: Figs 30–33 View Figs 27–33 . Yunnan. .......................... .............................................. S. platydentatus View in CoL sp. nov.

– Aedeagus with expulsion clasps slender; spermatheca with basal porch more emarginated on apical margin and spermatheca duct stout. ......................................... 9

9 Apical sclerotized area of aedeagal median lobe relatively short and wide, expulsion clasps slender in apical half; spermatheca duct ( Fig. 37 View Figs 34–41 ) more coiled at first bend. Habitus: Fig. 8 View Figs 6–10 ; sexual characters: Figs 34–37 View Figs 34–41 . Yunnan. .................................. S. tenuidentatus View in CoL sp. nov.

– Apical sclerotized area of aedeagal median lobe relatively long and narrow, expulsion clasps stout in apical half; spermatheca duct ( Fig. 45 View Figs 42–45 ) less coiled at first bend. Habitus: Fig. 10 View Figs 6–10 ; sexual characters: Figs 42–45 View Figs 42–45 . Yunnan. .......................................... S. alpigenus View in CoL sp. nov.