Mesonemoura sinistracurva Du & Wang, 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 sinistracurva Du & Wang , sp. nov.

( Figs. 9–15 )

MATERIAL EXAMINED

HOLOTYPE 3, CHINA, Zhejiang province, Tianmu Mountain, Lao- dian to Xianrending , 6-V-1999, Leg. Zhou Pei.

MALE

Head and antennae dark brown; pronotum transverse oblong, brown, with rugosities. Cervical gills single, short and oval, each one is located outside of lateral cervical sclerite. Wings subhyaline, slightly brown, veins brown. Legs brown. Abdomen pale except for terminalia darker. Forewing length 8.9 mm, hind wing length 7.6 mm. Tergum 9 ( Fig. 9 ) slightly sclerotized, with a small, asymmetrical notch mid-posteriorly, lef side of the notch forming an acute angle, and right side of the notch forming an obtuse angle, each lobe of the notch bearing a row of short, stout spinules. Tergum 10 with a median, thin concavity running the length of the tergum. Hypoproct ( Fig. 10 ) broad basally, tapering towards a small blunt rounded apex; vesicle slender, 2 × width. Paraprocts ( Figs. 11-13 ) divided into 3 lobes; inner lobe small, slightly sclerotized, with an acute tip directed outward; median lobe membranous, broad basally, with a rounded apical portion, bearing many hairs, middle part slightly sclerotized, forming a small projection, equal length of inner lobe, bearing many hairs; outer lobe narrow and long, sclerotized, with the apex curving inward to a large hook, bearing several hairs, basal part elongated and recurved dorsally alongside cerci. Epiproct ( Figs. 9, 13-15 ) narrowed basally, enlarged near apex; dorsal sclerite extending dorsolaterally towards apex, apical portion enlarged and extending over onto ventral sclerite, lateral margins of dorsal sclerite darkly sclerotized; ventral sclerite broad basally and becoming nar- rower towards apex, apical portion inserted between folds of dorsal sclerite, the apex extended distally forming a long flagelliform, sclerotized structure that curves strongly to the lef side; the flagelliform projection broad basally, and tapering to apex, having a slightly sclerotized dorsal and membranous ventral surface, length of the projection equal to the epiproct; epiproct ventral sclerite with spines ( Fig. 14 ).

FEMALE

Unknown.

DISTRIBUTION

CHINA (Zhejiang province).

ETYMOLOGY

The name “ sinistracurva ” is derived from Latin, meaning that the epiproct terminal process curves abruptly to the lef.

REMARKS

This species is characterized by the presence of a long stylus that curves abruptly to the left as it leave the tip of the epiproct. The new species is close to M. sbordonii Fochetti & Sezzi in the shape of the epiproct. The apical style of the new species is long and curved to the left, whereas in M. sbordonii , the style is longer still and only barely curved to the left. M. sbordonii also lacks the notch and spines on the posterior margin of tergum 9 found in the new species.

Figures

Figs. 9–15. Mesonemoura sinistracurva Du & Wang, sp. nov. 9. Male terminalia, dorsal; 10. Male terminalia, ventral; 11. Male terminalia, lateral; 12. Male paraproct (lef); 13. Male epiproct, dorsal; 14. Male epiproct, ventral; 15. Male epiproct, lateral.