Sinacroneuria lii Huo & Du sp. nov.

Adult habitus: General body color brown. Triocellate; distance between posterior ocelli almost almost equal to the eyes. Head brown; frontocylpeus area to M line, and the ocellar triangle dark brown (Fig. 6). Pronotum brown, with darker rugosities (Fig. 6). Wings translucent, veins dark brown; legs brown. Abdominal segments pale brown.

Male: Forewing length ca. 20 mm, hindwing length 18 mm, body length 16 mm. Tergum 9 with a postmedian sensilla basiconica patch, which bears a small median notch on the anterior margin; tergum 10 patch not completely divided, but the anterior margin with a large oval notch medially (Fig. 7). Hammer small, oval and flat, set near posterior margin of sternum 9, fine rugosities present on surface (Figs. 7, 8B). Paraprocts broad basally, apex becoming slender and claw-like, terminally acute and heavily sclerotized (Fig. 8A).

Aedeagus mostly membranous, basal lobe covered with fine hairs dorsally, and bearing dense ventral asperities on its anterior ½ length; apical lobe with a bristle ring (Figs. 9–10). Y-arms horn-like, inserted on the base of aedeagus, curved outward and upward; lateral sclerites slender and slightly sclerotized, truncated terminally; the median sclerite long and filiform, dorsal surface fully covered with short spines (Figs. 9–10).

Female, Egg and Nymph: Unknown.

Etymology: The species name is in honor of Prof. Li Zi-Zhong (Guizhou University), a famous Chinese entomologist.

Type material: Holotype: 1♂ (ICYZU), China, Guizhou Province, Zunyi City, Suiyang County, Kuankuoshui National Nature Reserve, beside a nameless road, 1435m, 28°13.205′N, 107°9.95′E, 2019-V-5, leg. Huo Qing-Bo, Yuan Jia-Wen, Du Yu-Zhou (Fig. 11).

Distribution: China (Guizhou Province).

Diagnosis: This new species shares a similar sensilla basiconica patch and aedeagal sclerites with S. fujianensis Sivec & Stark, 2020 . However, in S. fujianensis, the male tergum 10 patch is completely divided; lateral sclerites of aedeagus are tapered to acute, knife-like structures (Sivec & Stark 2020), and not truncated at apex. The median aedeagal sclerite of the new species is filiform, about two times the length of Y-arm. Additionally, the paraproct in new species is slender and claw like, not a short tooth.

Remark: The holotype, the only known specimen was collected by a small waterfall surrounded by dense riparian vegetation (Fig. 11).