Sinacroneuria lii Huo & Du, 2020

Qing-Bo, Huo & Yu-Zhou, Du, 2020, Two new species of Sinacroneuria Yang & Yang, 1995 (Plecoptera: Perlidae) from Guizhou, southwestern China, Zootaxa 4834 (2), pp. 283-292 : 284

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 ).

Figures

FIGURE 6. Sinacroneuria lii Huo & Du sp. nov., male habitus (dorsal and ventral); male head and pronotum.

FIGURE 7. Sinacroneuria lii Huo & Du sp. nov., male terminalia. A: dorsal; B: ventral; C: lateral.

FIGURE 8. Sinacroneuria lii Huo & Du sp. nov. A: male paraprocts (back view) B: hammer (dorsal view).

FIGURE 9. Sinacroneuria lii Huo & Du sp. nov., aedeagus completely everted (after soaking in 10% KOH solution).A: dorsal; B: ventral; C: lateral.

FIGURE 10. Sinacroneuria lii Huo & Du sp. nov., aedeagus. A–B: bristle ring on the apical lobe, ventral and lateral view; C: asperities on the ventral basal lobe; D–E: median sclerite, lateral and dorsal view.

FIGURE 11. Habitat (Kuankuoshui National Nature Reserve, Guizhou Province, China) and known distribution of Sinacroneuria lii Huo & Du sp. nov.