Ocychinus, Smetana, 2003

Zhao, Xin & Tang, Liang, 2020, Three new species of the genus Ocychinus (Coleoptera, Staphylinidae) from China, Zootaxa 4789 (1), pp. 204-216 : 214-215

Key to Ocychinus species

The key is based on species descriptions in literature and the photos of O. caeruleatus taken from SHNU collection and 12 species taken from Dr. Aleš Smetana’s collection by the second author in 2012.

1 Head and pronotum with strong metallic tint, interstices densely reticulated throughout; underside of aedeagal paramere with sensory peg setae..................................................................................... 2

- Head and pronotum without metallic tint, interstices smooth, rarely with partial portions indistinctly microsculptured or reticulated; underside of aedeagal paramere with/without sensory peg setae............................................ 3

2 Larger species, FL: 9.1 mm; head with posterior angles less rounded ( Fig. 42 ); TL/EYL: 2.41; many large punctures on pronotum ( Fig. 42 ); abdominal tergites with punctation denser ( Fig. 44 )................................ O. motuoensis sp. n.

- Smaller species, FL: 6.7–7.1 mm; head with posterior angles more rounded ( Fig. 43 ); TL/EYL: 1.46–1.73; few large punctures on pronotum ( Fig. 43 ); abdominal tergites with punctation sparser ( Fig. 45 )......................... O. smetanai sp. n.

3 Abdominal tergites VI and VII each with golden tomentose patch at middle; underside of aedeagal paramere with sensory peg setae............................................................................................... 4

- Abdominal tergites VI and VII without golden tomentose patch at middle; underside of aedeagal paramere without sensory peg setae............................................................................................... 6

4 Head ( Fig. 46 ) with punctation unevenly spread, very sparse on vertex and becoming denser and coarser laterad and posteriad; pronotum ( Fig. 46 ) with punctation quite fine, interstices distinctly wider than the diameter of punctures and appearing polished; pronotum with poorly defined impunctate midline....................................... O. huanghaoi sp. n.

- Head ( Fig. 47 ) with punctures almost even; pronotum ( Fig. 47 ) with punctation coarse, interstices distinctly narrower than the diameter of punctures and appearing dull; pronotum with elevated impunctate midline.............................. 5

5 Legs reddish. Habitus: Fig 15 . Aedeagus: Figs 3, 4 in Smetana (2010). China (Sichuan)...... O. bohemorum Smetana, 2010

- Legs dark brownish. Habitus: Fig 17 . Aedeagus: Figs 15–17 in Smetana (2005). China (Sichuan)................................................................................................... O. businskius ( Smetana, 2010)

6 Elytra purplish-blue or blue............................................................................. 7

- Elytra reddish to brownish............................................................................. 11

7 Elytra distinctly shorter than wide, abdominal tergite VII without apical membranous fringe; legs reddish. Habitus: Fig 5 in Smetana (2014). Male unknown. Eastern Nepal....................................... O. schneideri Smetana, 2014

- Elytra distinctly longer than wide, abdominal tergite VII with apical membranous fringe; legs black with somewhat paler tarsi ................................................................................................... 8

8 Disc of head with simple punctation, coarser punctures presented only on lateral portion. Habitus: Fig 20 . Aedeagus: Figs 50, 51 in Smetana (2003). China (Xizang).................................................... O. yeti ( Dvořák, 2000)

- Disc of head with dual punctation........................................................................ 9

9 Head 1.2 times wider than long with rounded hind angles; disc of pronotum without microsculpture, though rudimentary microsculpture gradually appearing toward anterior and both lateral portions of pronotum............................. 10

- Head 1.1 times wider than long with obtuse hind angles; disc of pronotum with fine and dense microsculpture. Aedeagus: Figs 56, 57 in Smetana (2003). China (Yunnan)............................................ O. capitalis Smetana, 2003

10 Smaller species, BL= 12 mm. Habitus: Figs 7, 8. Male unknown. China (Yunnan)............ O. caeruleatus Smetana, 2014

- Larger species, BL= 15–16 mm, Disc of pronotum with fine and dense microsculpture. Habitus: Fig 9 . Aedeagus: Figs 52–54 in Smetana, 2003. China (Xizang)..................................................... O. tibetanus Smetana, 2003

11 Head and pronotum with interstices distinctly smaller than the diameter of larger punctures and thus surface of head and pronotum appearing dull................................................................................. 12

- Head and pronotum with interstices distinctly larger than the diameter of punctures and thus surface of head and pronotum appearing polished..................................................................................... 13

12 Disc of head and pronotum ( Fig. 48 ) with punctation deep and dense. Habitus: Fig 11 . Aedeagus: Figs 86–88 in Smetana (2003). China (Sichuan)........................................................ O. meridionalis Smetana, 2003

- Disc of head and pronotum ( Fig. 49 ) with punctation relatively shallow and relatively sparse. Habitus: Fig 12 . Aedeagus: Figs 93, 94 in Smetana (2003). China (Yunnan)........................................... O. monticola Smetana, 2003

13 Pronotum ( Fig. 50 ) with relatively fine but distinct punctures................................................. 14

- Pronotum ( Fig. 51 ) with punctures nearly invisible.......................................................... 15

14 Pronotum longer than wide; abdominal tergite II densely punctate. Habitus: Fig 19 . Aedeagus: Figs 78–80 in Smetana (2003). China (Xizang)............................................................... O. businskorum Smetana, 2003

- Pronotum as long as wide; abdominal tergite II with scattered punctures on apical half. Habitus: Fig 13 . Aedeagus: Figs 58–60 in Smetana (2003). China (Xizang)................................................ O. xizangensis Smetana, 2003

15 Pronotum longer than wide; elytra with lateral sides parallel. Habitus: Fig 10 . Aedeagus: Figs 8, 9 in Smetana (2006). China (Sichuan).......................................................................... O. frater Smetana, 2008

- Pronotum as long as wide; elytra with lateral sides divergent apicad............................................ 16

16 Aedeagus with apical portion of median lobe and paramere symmetrical. Habitus: Fig 16 . Aedeagus: Figs 69, 70 in Smetana (2003). China (Sichuan)........................................................ O. paramerosus Smetana, 2003

- Aedeagus with apical portion of median lobe and/or paramere distinctly asymmetrical.............................. 17

17 Paramere slender, gradually narrowed apicad; median lobe with apical portion pointed apicad. Habitus: Fig 14 . Aedeagus: Figs 64–66 in Smetana (2003). China (Sichuan)......................................... O. sichuanensis Smetana, 2003

- Paramere robust, distinctly dilated in subapical portion; median lobe with apical portion hook-like, pointed laterad. Habitus: Fig 18 . Aedeagus: Figs 73–75 in Smetana (2003). China (Sichuan).............................. O. kalabi Smetana, 2003

Figures

FIGURES 42–45. Ocychinus. 42 head and pronotum of O. muotuoensis; 43 head and pronotum of O. smetanai; 44 abdominal tergite IV of O. muotuoensis; 45 abdominal tergite IV of O. smetanai. Scale bars = 2 mm.

FIGURES 46, 47. Head and pronotum of Ocychinus. 46 O. huanghaoi; 47 O. bohemorun Smetana, 2010. Scale bars = 2 mm.

FIGURES 15–20. Adult habitus of Ocychinus. 15 O. bohemorun Smetana, 2010 (paratype); 16 O. paramerosus Smetana, 2003 (holotype); 17 O. businskius (Smetana, 2010) (paratype); 18 O. kalabi Smetana, 2003 (holotype); 19 O. businskorum Smetana, 2003 (holotype); 20 O. yeti (Dvořák, 2003). Scale bars =2mm.

FIGURES 48, 51. Ocychinus. 48 head and pronotum of O. meridionalis Smetana, 2003; 49 head and pronotum of O. monticola Smetana, 2003; 50 pronotum of O. xizangensis Smetana, 2003; 51 pronotum of O. kalabi Smetana, 2003. Scale bars = 2 mm.

FIGURES 9–14. Adult habitus of Ocychinus. 9 O. tibetanus Smetana, 2003 (paratype); 10 O. frater Smetana, 2008 (holotype); 11 O. meridionalis Smetana, 2003 (paratype); 12 O. monticola Smetana, 2003 (holotype); 13 O. xizangensis Smetana, 2003 (holotype); 14 O. sichuanensis Smetana, 2003 (holotype). Scale bars =2mm.