Nigrimacula, Shi, Bian & Zhou, 2016

Yao, Yuqing, Bian, Xun & Zhang, Bin, 2025, Description of the female of Nigrimacula trigona Duan, Su, Shi & Chang, (Orthoptera: Tettigoniidae: Meconematinae) from Yunnan, China, Zootaxa 5609 (1), pp. 132-136 : 133

Key to known species of Nigrimacula (male)

1 Pronotal disc with 2 black spots.................................................................. N. binotata

- Pronotal disc with 4 black spots.......................................................................... 2

2 Internal margin of male cercus without spine or lobe in middle area, apical half expanded............................ 3

- Internal margin of male cercus with 1 spine or lobe in middle area, apical half faintly expanded....................... 6

3 Apical area of male cercus expanded on interno-dorsal and interno-ventral margins................................. 4

- Apical area of male cercus only expanded on interno-ventral margin............................................. 5

4 Apical area of male cercus narrowly lamellar expanding on interno-dorsal margin, interno-ventral margin with 2 obtuse and short processes, apical area compressed......................................................... N. biprotubera

- Apical third of male cercus compressed, interno-dorsal margin narrowly lamellar expanding, interno-ventral margin with a short conical process, apical area narrowing......................................................... N. trigona

5 Apical half of male cercus compressed, spoon-shaped.............................................. N. beybienkoi

- Apical half of male cercus rectangularly expanded on internal margin.................................. N. platycerca

6 Apical half of male cercus with teeth...................................................................... 7

- Apical half of male cercus without teeth................................................................... 8

7 Male cercus with basal area with 1 lamellar lobe on internal margin, following by 1 internal digitate process, ventral margin with 1 transverse lobe on subbasal area with minute teeth at apical margin, the process connecting with 5–6 teeth, interno-ventral margin of apical area rectangularly expanded with 15–16 teeth................................. N. xizangensis

- Male cercus stout, apical area excavated with 1 lamellar lobe on dorsal margin, its apex with 9 teeth, following by 1 cylindrical process with 7 teeth at apex, internal margin with 1 spatulate process bearing 15 apical teeth, interno-ventral margin with 1 oblique, lamellar lobe with 7 teeth at apex...................................................... N. quadrinotata

8 Internal margin of male cercus with 1 lamellar lobe in middle area or apical half................................... 9

- Internal margin of male cercus with 1 process in middle area.................................................. 11

9 Male cercus long with 1 digitate lobe on interno-dorsal margin and 1 small rectangular process on interno-ventral margin, apical area of cercus compressed...................................................................... N. laminata

- Male cercus short, internal margin with 1 rectangular lobe.................................................... 10

10 Internal lobe of male cercus large, ventral margin with a short obtuse internal lobe near middle area............ N. inlobata

- Internal lobe of male cercus narrow and short, ventral margin without lobe......................... N. wuliangshanensis

11 Internal margin of male cercus not expanded, with 1 short process in middle area, apical area of cercus compressed................................................................................................ N. sichuanensis

- Internal margin of male cercus moderately expanded........................................................ 12

12 Male cercus terminating from base to apex, apical area bifurcated in lateral view.................... N. paraquadrinotata

- Male cercus almost of equal width from base to apex, apical area moderately expanded................... N. compressata