Mesonemoura sichuanensis Du & Ji & Wang 2015, sp. nov.
Creators: name: Du, Yu-Zhou
name: Ji, Xiao-Yu
name: Wang, Zhi-Jie
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Nemouridae
Mesonemoura
Mesonemoura sichuanensis

description: 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.
description: Published as part of Du, Yu-Zhou, Ji, Xiao-Yu & Wang, Zhi-Jie, 2015, Description of three new Chinese species of the genus Mesonemoura (Plecoptera: Nemouridae), pp. 130 in Florida Entomologist 98 (1) on page 130, DOI: 10.1653/024.098.0122, http://zenodo.org/record/12769346