Indonemoura curvispina, Li, Weihai, Wu, Limin & Yang, Ding, 2017

Li, Weihai, Wu, Limin & Yang, Ding, 2017, Two new species of Indonemoura (Plecoptera: Nemouridae) from Yunnan Province of southwestern China, Zootaxa 4231 (2), pp. 289-295 : 290

Indonemoura curvispina sp. nov.

(Figs. 1–5, 11)

Diagnosis. Basal half of femora is yellow, distal half dark brown. Male epiproct in dorsal view nearly truncate at apex. Median lobe of male paraproct is bifurcate apically, bearing a stout lower spine and a longer but slender upcurved spine.

Adult habitus (Fig. 11). Holotype male with forewing length ca. 8.2 mm, hindwing length ca. 6.9 mm. Head and antennae dark brown; compound eyes dark; mouthparts and palpi brown. Thorax dark brown; pronotum subquadrate, corners obtuse, with obscure markings; leg distinctly pattered: basal half of femora yellow but distal portion of femora dark brown, tibiae grayish brown and distal portion lighter, yellow pattern of midleg femora less distinct. Wings brownish with veins darker. Abdominal segments dark brown, clothing hairs mostly pale brown.

Male terminalia (Figs. 1–5). Tergum 8 sclerotized, with a row of scattered spinules at posterior margin. Tergum 9 sclerotized, with a shallow mid-anterior constriction, with two paramedial groups of tiny spines at posterior margin (Fig. 1). Sternum 9 with anterior margin produced backward, anteromedial portion with a claviform vesicle, the vesicle mostly membranous except anterior and lateral margins sclerotized, basal part of the ventral membrane covered by granules, relatively short, and length ca. 2X width (Fig. 2); hypoproct basally broad and oval, then gradually tapering at midlength toward tubular tip. Tergum 10 sclerotized except a membranous longitudinal median concavity beneath epiproct, the concavity flanked by weakly elevated lateral areas bearing several spinules and strong hairs at anterolateral margins. Cercus membranous, slightly narrowing toward tip, relatively short, length ca. 2.5X width. Epiproct (Figs. 3-4) recurved and elongate to posterior margin of tergum 9, subapical area enlarged laterally, apex nearly truncate; dorsal sclerite mostly sclerotized, surrounding an erect oblong median membrane apically contacting with an anterior upside down Y-shaped sclerite extended from anterior part of ventral sclerite, lateral sclerite stout with parallel sides at total length but a widened erect triangular sclerite subapically; ventral sclerite with an ovum-shaped ventral ridge subapically in lateral aspect, bearing a row of ca. 14-15 tiny spines at each lateral side. Paraproct with 3 lobes (Figs. 2 & 5): inner lobe sclerotized, typical of the genus, small and triangular adhering to median lobe; median lobe darkly sclerotized, elongate and extending to abdominal tip, apex spine-like and bilobed, bearing a stout lower spine and a longer but slender up-curved upper one, each of spines with sharp tip; outer lobe a strongly sclerotized curved stripe, apical third straight, apex blunt and slightly up-curved, with a larger apical spine at outer margin and a small, dorsal, subapical spine at proximal margin (Fig. 1).

Female. Unknown.

Type material. Holotype: male ( HIST), China: Yunnan Province, Nujiang Perfecture, Lushui County, Liuku Town (where both Perfecture and County people's governments are located), ca. 2km W Xinzhai village, unnamed stream into Nu / Salween River , N25°80.8720', E98°87.5146', 1900 m, 2012. VII.25–VIII.10, leg. J. Ch. Wang .

Etymology. The specific name refers to the large curved apical spine of median lobe of paraproct.

Distribution. China (Yunnan).

Remarks. The new species seems related to I. indica (Kimmins, 1 947) in having a similar bilobed paraproct. However, the new species may be separated from I. indica by the truncate apex of the epiproct in dorsal aspect, apical portion of lateral sclerite of epiproct extended straight forward with approximately flat dorsal surface in lateral aspect, and by outer lobe of the epiproct enlarged apically with single sharp spine. In I. indica , the apex of epiproct tapers to a rounded apex and the lateral sclerite of epiproct is up-curved apically, forming a deep dorsal notch in lateral aspect (figs. 4A & 4B in Kimmins 1947, figs. 14–17, in Aubert 1967), and the outer lobe is gently tapering toward the apex, lacking an apical spine (figs. 16–17, in Aubert 1967).