Nemoura oculata, Wang & Du & Sivec & Li, 2006

Wang, Zhi-Jie, Du, Yu-Zhou, Sivec, Ignac & Li, Zi-Zhong, 2006, Records And Descriptions Of Some Nemouride Species (Order: Plecoptera) From Leigong Mountain, Guizhou Province, China, Illiesia 2 (7), pp. 50-56 : 54

Nemoura oculata sp.n.

Wang & Du ( Figs. 15‐21 )

Material examined. Holotype ♂, China: Guizhou Province, Leigong Mountain, Lianhuaping , 1450‐ 1620 m, 17‐18 September 2005, Wang Zhi‐ Jie.

Adult habitus. Head brown, wider than pronotum. Antennae pale brown, pronotum pale brown, wider than long, angles bluntly rounded. Wings hyaline, light brown with brown veins. Legs pale brown, hind femora with pale band at distal third; apex of tibiae and last tarsal segment dark.

Male. Forewing length 7.9 mm; hindwing length 7.2 mm. Abdomen pale on anterior segments and darker on distal segments. Tergum 9 slightly raised medially, weakly sclerotized with middle of distal margin extended outward forming a triangular projection ( Fig. 15 ); projection armed with several strong, longer spines laterally and extending partly over base of tergum 10. Tergum 10 sclerotized, dark brown and bearing a small medial indentation near posterior margin of tergum 9. Apical part of hypoproct curved inward at posterior margin of sternum 9 ( Fig. 16 ); vesicle slender reaching over half of hypoproct. Paraprocts bilobed ( Fig. 18 ); inner lobe sclerotized, slender, shorter than half of outer lobe; outer lobe slightly sclerotized with wide base tapering in apical 2/3 and ending with a black, acute hook which curvers toward inner lobe ( Figs. 15‐18 ). Quadrangular sclerotized portion cuved ventrally at midlength of outer lobe. Epiproct calabash shaped in dorsal aspect, constricted medially, with large basal cushion and slightly sclerotized lateral arms ( Figs. 19‐ 21 ). Ventral sclerite forms two oblong sclerotized circles which extend toward tip; ventral sclerite sclerotized forming a long and narrow keel with two lines of black spines on the keel. Dorsum of cerci sclerotized with a strong, apical spine.

Female. Unknown.

Distribution. Guizhou Province (Leigong Mountain), China.

Remarks. Genus Nemoura is one of the largest genera among Nemouridae with more than 100 described species, 24 of which are recorded for China (Li & Yang 2006). Comparison of our specimens with types available in the Institute of Zoology, Chinese Academy of Sciences, shows N. oculata is distinct. The new species is similar to N. basispina Li & Yang in epiproct shape but differs in shape of paraprocts, in tergum 10, and in shape and armature of tergum 9.

Etymology. The name refers to the characteristic shape of the ventral epiproct sclerite.

Figures

Figs.15‐21. Nemoura oculata, sp. n. 15. Male terminalia, dorsal; 16. Male terminalia, ventral; 17. Male terminalia, lateral; 18. Male paraproct; 19. Male epiproct, dorsal; 20. Male epiproct, ventral; 21. Male epiproct, lateral.