Mesonemoura sichuanensis Du & Ji, 2015

Du, Yu-Zhou, Ji, Xiao-Yu & Wang, Zhi-Jie, 2015, Description of three new Chinese species of the genus Mesonemoura (Plecoptera: Nemouridae), Florida Entomologist 98 (1), pp. 130-130 : 130-

Mesonemoura sichuanensis Du & Ji , sp. nov. ( Figs. 5–8 )

MATERIAL EXAMINED

HOLOTYPE 3, CHINA, Sichuan province, Litang county , 25-VI-2009, N 30° 011' E 100° 317', 4,300 m asl, Leg. Qian Yu-Han . PARATYPES, 1 3, the same data as holotype ; 2 33, Sichuan province, Luding county, Hailuogou , 3-VII-2009, ', N 29° 60.3' E 102° 076 E, 2,200m, Leg. Qian Yu-Han; 66 33 , Sichuan province, Luding county, Yangjiageng river , 4-VII-2009, N 29° 52.877' E 102° 1.193' E, 3,646 m asl, Leg. Qian Yu-Han; 1 3 , Tibet, Bomi county , 21-VI-2009, N 29° 48.380' E 95° 41.956', 3,522 m asl, Leg. Qian Yu-Han .

MALE

Head and antennae dark brown; pronotum brown, angles blunt rounded. Wings hyaline, veins brown. Legs brown, the middle of femora slightly brown. Forewing length 6.2-6.7 mm, hind wing length 5.2-5.6 mm. Tergum 1-8 sclerotized at anterior margin laterally. Tergum 9 ( Fig. 6 ) sclerotized,with a small notch mid-posteriorly,both sides of the notch forming an obtuse angle with several short spines. Tergum 10 sclerotized. Hypoproct ( Fig. 5 ) broad basally, abruptly tapering towards the apex; vesicle slender, length 3 × width. Paraprocts ( Figs. 5, 7 ) divided into 3 lobes; inner lobe sclerotized, large, triangular; median lobe branched into 2 portions, inside portion of median lobe membranous, bearing many hairs, fused with outer lobe, another portion sclerotized, slender, slightly longer than membranous portion; outer lobe slender, sclerotized, basal part recurved along basal of cerci, other part fused with membranous portion of median lobe. Epiproct ( Figs. 6, 8 ) dorsal sclerite sclerotized basally, apical portion membranous; lateral sclerite sclerotized; ventral sclerite slightly sclerotized, basal broad, 2 × width of dorsal sclerite, apex narrowed distinctly, apical portion inserted between folds of dorsal sclerite, apex extended distally, forming a long slightly sclerotized flagellum; the flagellum broad basally, tapering towards the apex, with a pointed tip; epiproct ventral sclerite with several spines.

FEMALE

Unknown.

DISTRIBUTION

CHINA (Sichuan province; Tibet Autonomous Region) .

ETYMOLOGY

The new species is named for the type locality, Sichuan.

REMARKS

This species is characterized by tergum 9 forming a pair of obtuse angle mid-posteriorly, and by the ventral sclerite of epiproct basal broad, 2 × width of dorsal sclerite. The new species is close to M. spiroflagellata ( Wu 1973) . But in the new species, basal of ventral sclerite 2 × width of dorsal sclerite, while ventral sclerite is not much wider than basal of dorsal sclerite in M. spiroflagellata . In M. spiroflagellata , tergum 9 does not form angles.

Figures

Figs. 5–8. Mesonemoura sichuanensis Du & Ji,sp. nov.5. Male terminalia,ventral; 6. Male terminalia, dorsal; 7. Male terminalia, lateral; 8. Male epiproct, ventral.