Indonemoura bilateralia Du & Wang

Wang, Zhi-Jie & Du, Yu-Zhou, 2009, Four new species of the genus Indonemoura (Plecoptera: Nemouridae) from China, Zootaxa 1976, pp. 56-62 : 56-57

Indonemoura bilateralia Du & Wang , sp. nov.

( Figs. 1–7 )

Diagnosis. This species is characterized by darkened lateral sclerites on the epiproct and a tuft of spinules located subapically on the ventral sclerite of the epiproct. Additionally, the heavily sclerotized outer lobe of the paraproct is much longer than the median lobe and terminates in a large spine and a smaller lateral one subapically.

Male. Forewing length 7.5–7.6 mm (n=2), hind wing length 6.4–6.5 mm. Head and antennae brown, pronotum pale brown, transverse rectangle with bluntly rounded angles. Wings subhyaline, pale brown with brown veins. Legs brown. Tergum 9 with a mid-anterior indention. Tergum 10 with a median anterior concavity below epiproct. Hypoproct long, broad basally, tapering to a narrow and long tip; vesicle slender, length 3X width. Paraprocts divided into 3 lobes; inner lobe thin and long, slightly sclerotized, with an acute tip; median lobe broad basally, mostly membranous, branched to two portions, inner portion of median lobe membranous, a little longer than inner lobe, outer portion darkly sclerotized, forming a long, thin sclerotized bar with 3 or 4 prongs at tip, a little longer than membranous portion; outer lobe of paraproct darkly sclerotized, much longer than median lobe, with a strong prong at apex, and a small lateral spine subapically, basal part elongate and recurved dorsally alongside cerci. Epiproct long and narrow in dorsal aspect; dorsal sclerite mostly membranous, forming a mid-anterior notch, with apex slightly sclerotized; lateral arms distinctly sclerotized, more distinct in lateral view and extending to ventral surface; ventral sclerite sclerotized, broad basally, tapering to narrow tip, forming a long and narrow keel, bearing a bundle of long spinules ventrally.

Female. Unknown.

Type material. Holotype, male, Taoyuan, Hunan province, 28°55' N, 111°29' E, 12 May 1995, Leg. ZHENG Bo-Yi. Paratype, male, same data as the holotype.

Etymology. The name refers to the darkly sclerotized lateral arms of the epiproct. The latin “ bilateralia ” meaning the two lateral sides.

Remarks. The lateral view of the epiproct of I. bilateralia appears similar to that of I. trilongispina Du & Wang, 2006 ; however, the new species bears a bundle of long spinules of one length on the ventral sclerite. The ventral sclerite of I. trilongispina is divided into a pair of sclerotized bars that extends to the base of the epiproct, each bearing a row of tiny, black spines and three longer ones distally. In the new species, the outer lobe of the paraproct is much longer than the median lobe and it has a strong spine at the apex and a smaller one subapically; its apex being divergent from the sclerotized portion of the median lobe. The outer lobe of I. trilongispina is elongate and parallel to the sclerotized distal part of the median lobe.

Figures

FIGURES 1 – 7. I ndonemoura bilateralia Du & Wang, sp. nov. 1. Male terminalia, dorsal; 2. Male terminalia, ventral; 3. Male terminalia, lateral; 4. Male paraproct (left); 5. Male epiproct, dorsal; 6. Male epiproct, ventral; 7. Male epiproct, lateral.