Indonemoura maoershana, Mo & Wang & Yang & Li, 2020

Mo, Raorao, Wang, Guoquan, Yang, Ding & Li, Weihai, 2020, A new species of the Indonemoura fujianensis complex (Plecoptera: Nemouridae) from the Guangxi Zhuang Autonomous Region of southern China, Zootaxa 4801 (2), pp. 395-400 : 396

Indonemoura maoershana sp. nov.

( Figs. 1–3 )

Adult habitus ( Figs. 1 a–1b). General color dark brown. Head and mouthparts dark brown; antennae brown, scape and pedicel darker; palpi pale brown; compound eyes black. Thorax including pronotum dark brown. Pronotum rectangular with darker cuticular rugosities; anterior margin pale. Legs mostly brown, femora of midlegs and hindlegs with a wide yellow band at apical half; wings brownish, subhyaline with darker veins. Abdominal segments mostly brownish but terminalia darker with hairs light brown.

Male ( Figs. 1–3 ). Forewing length ca. 8.0 mm, hindwing length ca. 7.0 mm. Tergum 9 ( Figs. 1a , 3a ) distinctly sclerotized, gradually constricted medially forming a weakly sclerotized mid-posterior subtrapezoidal area, bearing scattered, tiny black spines at mid-posterior portion. Sternum 9 ( Figs. 2a , 3b ) with claviform vesicle, constricted basally; hypoproct basally wide, then gradually tapering towards tip. Tergum 10 ( Figs. 1a , 3a ) mostly sclerotized, with narrow longitudinal concavity beneath epiproct bearing pairs of groups of black tiny spines located at anterolateral margin. Cercus slightly sclerotized, nearly cylindrical with distinct hairs. Epiproct ( Figs. 1c , 2 b–2e, 3a, 3c–3d) basal half nearly parallel-sided, and then slightly enlarged in dorsal view, with distinct apical incision; ventral sclerite strongly sclerotized, broad at base and becoming narrower toward apex, expanded ventrally into a very large semicircular ridge with rows of black spines. Paraproct trilobed ( Figs. 1c , 2 a–2c, 3a–3b, 3d– 3g): inner lobe sclerotized and slender, adhering to median lobe; median lobe sclerotized, hook-like, basally broad and then tapering toward weakly sclerotized apex, but somewhat swollen on outer margin in apical half; outer lobe darkly sclerotized, longer than median lobe with two apical branches, U-shaped in dorsal view: the inner subapical circular sclerite flat in lateral view, but it seems like a prong in ventral and dorsal view; the slender outer prong with a short basal spine, about half of the prong length located in outer margin.

Female. Unknown.

Type material. Holotype: 1 male ( HIST), China: Guangxi Zhuang Autonomous Region, Guilin City , Xing’an County, Tongrencun , Maoershan National Natural Reserve , Jiulongtang , 2004.IV.30, Ding Yang.

Etymology. The name of the species refers to the type locality, Mt. Maoershan.

Distribution. China (Guangxi Zhuang Autonomous Region).

Remarks. The new species is similar to the Vietnamese species, I. clavata Sivec & Stark, 2010 in having slender inner paraproctal lobe attaching to the median paraproctal lobe, and hooked median paraproctal lobe which slightly swollen on outer margin in apical half. The male of the new species can be easily separated from I. clavata by the tip of outer paraproctal lobe which has a slender outer prong with a short basal spine and a flat inner subapical circular sclerite. In I. clavata , the outer lobe of paraproct only has a pair of short, nearly equally sized apical spines ( Sivec & Stark 2010). Furthermore, I. maoershana shares a similar U-shape tip of outer paraproctal lobe in dorsal view with I. fujianensis from Fujian Province of the southeastern coast of China. However, the new species may be easily separated from the latter by its hooked median lobe of paraproct and slender inner paraproctal lobe. In I. fujianensis , median lobe of paraproct broad and subtriangular with a blunt tip and inner lobe of paraproct is triangular. In addition, outer paraproctal lobes of two species are quite different ( Li & Yang 2005). In I. maoershana , the outer lobe of paraproct bears a inner subapical circular sclerite and a slender outer prong with a shorter basal spine on outer margin, while outer paraproctal lobe of I. fujianensis has two slender apical spines, but the outer spine of the left outer lobe is forked ( Li & Yang 2005). Terminalia of males of the I. fujianensis complex and with the genus as a whole, are similar morphologically. The terminalia of females, however, are usually extremely diagnostic. Unfortunately, only a single male of this species was available, and future studies hopefully will produce associated females to test the specific validity of this new taxon.

Figures

FIGURE 1. Indonemoura maoershana sp. nov. (male). a. Adult habitus, dorsal view. b. Head and pronotum, dorsal view. c. Terminalia, dorsal view.

FIGURE 2. Indonemoura maoershana sp. nov. (male). a. Terminalia, ventral view. b. Epiproct and apex of outer lobes of paraprocts, caudal view. c. Epiproct and apical half of outer lobe of left paraproct, lateral view. d. Median ridge of ventral sclerite of epiproct, lateral view. e. Epiproct, top view.

FIGURE 3. Indonemoura maoershana sp. nov. (male). a. Terminalia, dorsal view. b. Terminalia, ventral view. c. Epiproct, dorsal view. d. Epiproct and apical half of outer lobe of left paraproct, lateral view. e. Left paraproct, ventral view. f. Apex of outer lobe of left paraproct, oblique top view. g. Apex of outer lobe of left paraproct, top view.