Pentacentrus Saussure, 1878

Li, Ruotong, Xu, Fei & Liu, Hao-Yu, 2019, A contribution to the taxonomy of the genus Pentacentrus Saussure (Orthoptera: Gryllidae: Pentacentrinae), Zootaxa 4671 (3), pp. 434-438 : 435-436

Key to the species of Pentacentrus Saussure from China

1. Genitalia almost as long as wide, lateral lobes of epiphallus not reaching or slightly extending over posterior margin of epiphallus................................................................................................. 2

- Genitalia longer than wide, lateral lobes of epiphallus distinctly extending over posterior margin of epiphallus........... 3

2. Ventral parts of genitalia covered with long setae, lateral lobes of epiphallus distinctly bent upwards.............................................................................................. P. multicapillus Liu & Shi, 2011

- Ventral parts of genitalia without long setae, lateral lobes of epiphallus not bent upwards........ P. parvulus Liu & Shi, 2014

3. Apex of epiphallus parameres acute....................................................................... 4

- Apex of epiphallus parameres blunt....................................................................... 7

4. Apex of epiphallus parameres bent downwards; subgenital plate almost as long as wide........ P. formosanus Karny, 1915

- Apex of epiphallus parameres bent upwards; subgenital plate distinctly longer than wide............................. 5

5. Lateral lobes of epiphallus rather short; epiphallus parameres moderately long............... P. bituberus Liu & Shi, 2011

- Lateral lobes of epiphallus very long; epiphallus parameres quite long........................................... 6

6. Lateral lobes of the epiphallus thin, which are bent outwards and the epiphallus parameres distinctly bent inwards at apex........................................................................... P. acutiparamerus Liu & Shi, 2014

- Lateral lobes of epiphallus are rather wide and straight, and the epiphallus parameres only slightly bent inwards at apex............................................................................. P. sororius Zong, Qiu & Liu, 2017

7. Lateral lobes of epiphallus double curved; posterior margin of supra-anal plate rounded............................. 8

- Lateral lobes of epiphallus unlike above; posterior margin of supra-anal plate emarginate in middle.................... 9

8. Epiphallus distinctly transverse; lateral lobes of epiphallus distinctly double curved, covered with several long hairs at apex and along inner margin; epiphallus parameres very short.................................. P. transversus Liu & Shi, 2015

- Epiphallus rather narrow; lateral lobes moderately double curved, without long hairs along inner margin; epiphallus parameres slightly elongate, reaching middle of lateral lobes..................................... P. biflexuous Liu & Shi, 2014

- Lateral lobes of epiphallus not bent or slightly bent outwards at apex, apex blunt.................................. 10

10. Epiphallus parameres bent outwards at apex; lateral lobes of epiphallus slightly bent outwards at apex......................................................................................... P. medogensis Zong, Qiu & Liu, 2017

- Epiphallus parameres bent inwards at apex; lateral lobes of epiphallus not bent............... P. dulongjiangensis sp. nov.