Table 2. Morphological differences between the five species of Qianguimon Huang, 2018.

Species/character	Q. yuzhouense n. sp.	Q. rongxianense	Q. aflagellum	Q. elongatum	Q. splendidum
Carapace	Regions distinct, surface rugged	Regions indistinct, surface generally smooth	Regions indistinct, surface generally smooth	Regions indistinct, surface generally smooth	Regions indistinct, surface very smooth
Flagellum of exopod of third maxilliped	Very short to absent	Short length	Very short to absent	Absent	Absent
G1 in situ	Exceeding sternites 4/5 suture	Not reaching sternites 4/5 suture	Reaching to sternites 4/5 suture	Well exceeding sternites 4/5 suture	Exceeding sternites 4/5 suture
G1 and the shape of sub-distal projection	Very slender, bend inward about 45°, blunt	Generally slender, bend inward about 20°, large triangular	Generally slender, upward straightly, large triangular	Very slender, bend inward about 20°, blunt	Very slender, upward straightly, large triangular
Opening of female vulvae	Inward and deflect about 45°	Inward and deflect about 20°	Inward without deflect	Inward without deflect	Inward and deflect about 20°