Sinaphaenops Uéno and Wang, 1991

Genus Sinaphaenops Uéno and Wang, 1991 View in CoL

Sinaphaenops Uéno and Wang 1991: 128 View in CoL .

Type species: S. mirabilissimus Uéno and Wang, 1991 .

Distribution. Guizhou Province (Guiyang, Liupanshui, Anshun and Qiannan) and Guangxi Zhuang Autonomous Region (Hechi), China. This is the first record of a cave-adapted trechine beetle in Guiyang, Guizhou Province ( Fig. 1 View Fig ).

KEY TO SPECIES OF THE GENUS SINAPHAENOPS View in CoL (modified from Chen et al. 2017)

1. Right mandible tridentate; protibia with a longitudinal sulcus (subgenus Sinaphaenops Uéno and Wang View in CoL ) ................................ 2

1 ʹ. Right mandible bidentate; protibia without a longitudinal sulcus ............................ 10

2. Body stouter; neck constriction comparatively wide ........................................ 3

2 ʹ. Body slenderer; neck constriction distinctly narrow ............................................. 7

3. Pronotum with pair of lateromarginal setae ................................................ 4

3 ʹ. Pronotum without lateromarginal setae........... 5

4. Lateral margins of pronotum faintly bisinuate before hind angles, which are acute .......... ............................. S. ( s. str.) lipoi n. sp.

4 ʹ. Lateral margins not sinuate, hind angles obtuse .................. S. ( s. str.) banshanicus Tian, Chen and Tang

5. Three dorsal pores present on third elytral stria ................................................. 6

5 ʹ. Two dorsal pores present on third elytral stria ................................................. 7

6. Sides of pronotum strongly sinuate before hind angles, which are rectangular and pointed ........... S. ( s. str.) yaolinensis Tian, Chen and Yang

6 ʹ. Sides of pronotum not sinuate before hind angles, which are rounded ......... S. ( s. str.) trisetiger Uéno

7. Body stouter; head with three pairs of frontal pores; neck constriction indistinct; hind angles of pronotum rectangular..... S. ( s. str.) mochongensis Tian and Huang

7 ʹ. Body slenderer; head with two pairs of frontal pores; neck constriction distinct; hind angles of pronotum rounded ................ S. ( s. str.) orthogenys Uéno

8. Posterior frontal setae absent (individuals from Libo County) or present (individuals from Huanjiang County); aedeagus slenderer, with apical lobe broader ............ S. ( s. str.) wangorum Uéno and Ran

8 ʹ. Posterior frontal setae always present; aedeagus stouter, with apical lobe narrower ............. 9

9. Head narrower; lateral margin of elytra in middle visible from above ......... S. ( s. str.) gracilior Uéno and Ran

9 ʹ. Head wider; lateral margin of elytra in middle not visible from above .............. S. ( s. str.) mirabilissimus Uéno and Wang

10. Pronotum with two pairs of lateromarginal setae; protarsomeres 1 and 2 in male inermous inwards apically (subgenus Dongaphaenops Deuve and Tian ) .......... ........... S. ( D.) xuxiakei Deuve and Tian

10 ʹ. Pronotum without lateromarginal setae; protarsomeres 1 and 2 in male spurred inwards apically (subgenus Thaumastaphaenops Magrini, Vanni and Zanon ).... ................................................. 11

11. Elytron with three setiferous dorsal pores but without preapical pore ............. S. ( T.) bidraconis Uéno

11 ʹ. Elytron with two setiferous dorsal pores (anterior and middle ones) and with preapical pore ............ S. ( T.) pulcherrimus Magrini ,

Vanni and Zanon