Indonemoura tortuosa Wang & Du

Wang, Zhi-Jie & Du, Yu-Zhou, 2009, Four new species of the genus Indonemoura (Plecoptera: Nemouridae) from China, Zootaxa 1976, pp. 56-62 : 60

Indonemoura tortuosa Wang & Du , sp. nov.

( Figs. 22 –28)

Diagnosis. This species is characterized by a reflexed hook at the tip of the epiproct, by a squatty hypoproct and vesicle, and by the outer lobe of the paraproct having a reduced base and narrow, dorsally curving process terminating in a knob.

Male. Forewing length 7.5–7.6 mm, hind wing length 6.4–6.5 mm. Head and antennae pale brown. Pronotum pale brown, subquadrate with bluntly rounded angles. Wings smoky gray, veins pale. Legs pale brown. Tergum 8 with a mesal, trangular sclerotized area extending as a short, mid-posterior lobe armed with several small spinules. Tergum 9 concave anteromedially, bordered by a small, sclerotized area; tergum armed with several tiny spines near posterior margin. Tergum 10 with a large median concavity below epiproct, anterolateral margin of the concavity sclerotized. Hypoproct broad basally, tapering to a bluntly rounded, long tip. Vesicle swollen, length slightly less than 2X width. Paraprocts three-lobed; inner lobe expecially small. Median lobe slender, sclerotized, a long, darkly-sclerotized bar protrudes from basal part of median lobe. Outer lobe darkly sclerotized, much longer than median lobe, with swollen tip. Basal part of outer lobe elongate and recurved dorsally alongside cerci, and joined with the sclerotized bar of median lobe at ventral side of cerci. Epiproct long and narrow in dorsal aspect, widest proximally; dorsal sclerite mostly membranous, extending to ventral surface, with a bifurcate, swollen, slightly sclerotized apex that is more distinct in lateral and ventral view, and bearing an upwardly tortuous projection at apex. Lateral arms distinctly sclerotized and covered by dorsal sclerite that is more distinct in ventral view. Ventral sclerite dark, broad basally, tapering to a narrow tip and forming a large, inverted, apical, triangular tubercle that bears a bundle of small spinules on the tubercle surface.

Female. Unknown.

Type material. Holotype, male, Roadside of peak of Niba Mountain, Sichuan Province, 29°50' N, 102°51' E, 2250 m, 17 Jun. 1996, Leg. DU Yu-Zhou. Paratypes, 2 males, same data as the holotype.

Etymology. The name refers to the upwardly flexed projection found on the epiproct apex of this species. The Latin “ tortuosa ” meaning to be bent or tortuous.

Remarks. No similar species are among recently described Chinese Indonemoura species. The epiproct shape can separate this new species from all other species belonging to this genus.

Figures

FIGURES 22 – 27. Indonemoura tortuosa Wang & Du, sp. nov. 22. Male terminalia, dorsal; 23. Male terminalia, ventral; 24. Male terminalia, lateral; 25. Male paraproct (left); 26. Male epiproct, dorsal; 27. Male epiproct, ventral; 28. Female, ventral.