Indonemoura scalprata ( Li & Yang, 2007 )

Mo, Raorao, Wang, Guoquan, Yang, Ding, Li, Weihai & Murányi, Dávid, 2021, Two new species and four unknown larvae of Amphinemurinae (Plecoptera, Nemouridae) from southern China, Zootaxa 5040 (1), pp. 77-101 : 94-96

Indonemoura scalprata ( Li & Yang, 2007)

( Figs 15–18 )

Amphinemura scalprata Li & Yang, 2007: 61 . Holotype male (CAU), China, Guangdong, Yingde , Shimentai.

Indonemoura scalprata: Yang, Li & Zhu, 2015: 284 .

Indonemoura scalprata: Yang & Li, 2018: 15 .

Indonemoura scalprata: Mo, Wang, Yang, Li & Murányi, 2019: 39 .

Complementary description of adults. Male ( Figs. 15A–D ). Tergum IX sclerotized, with 2 paramedial groups of tiny spines along mid-posterior margin. Slender vesicle of sternum IX claviform, length is about 4X of maximum width, constricted basally and slightly constricted medially. Hypoproct rectangular basally, gradually narrowing towards nipple-like tip. Tergum X sclerotized, a shallow concavity present below the epiproct, bearing a few tiny spines on either side of the concavity. Epiproct slender, subrectangular with an apical shallow incision, a pair of slim and strongly sclerotized straps with constricted apical part and a slender triangular ventral sclerite. Paraproct trilobed: outer lobe sclerotized, strongly outcurved, blade-shaped; median lobe distinctly sclerotized, basally wide and rectangular, with apical black spines; inner lobe triangular, sclerotized, slightly hidden by hypoproct.

Female ( Figs. 15E–F ). Sternum VII weakly sclerotized. Sternum VIII weakly sclerotized besides a large, darkly sclerotized subrectangular subgenital plate with an anteromedial triangular notch, and with an M shaped sclerite below sternum VIII. Sternum IX moderately sclerotized, rectangular.

Description of mature larva. Measurements: Body length: 5.0– 5.4 mm (excluding antennae and cerci).Habitus ( Figs. 16–18 ). Body relatively slender for genus, general colour brown, with paler pronotum and cerci ( Fig. 16 ). Legs moderately long, width of hind femora as long as 1/3 of their length. Pronotum rectangular with rounded corners, wider than long, slightly narrower than head. Wing pads> 2X as long as the corresponding segments. Abdomen relatively slender, integument light matt brown, first 5 abdominal segments terga and sterna entirely divided by pleura, further 2 partly divided by pleura ( Figs.16 , 18A–C ). Posterior margin of sternum IX of the male larva sharply triangular in the middle with claviform and raised vesicle seen by transparency; sternum X divided, forming a pair of primary paraprocts; tergum X divided, forming a slender triangular developing epiproct. Cerci long, with 31–33 cylindrical segments; last 10 segments 3–5X longer than width ( Fig. 18D ).

Setation ( Figs. 16–18 ). Head, antennae, and palpi with dense short setae. Pronotum covered with very short setae; marginal setae distinct and blunt, row continuous but setae shorter in anteromedial and posteromedial half, corners have the longest setae that are as long as 1/10 of pronotum width ( Figs. 16 , 17A ). Setae on mesonotum and metanotum longer and distinct, as long as marginal setae on pronotum; wing pads with short, acute setae besides marginal ones. Legs with scarce setation, all tibia bears distinct, relatively dense swimming hairs distinctly longer than its width ( Figs. 16 , 17B–C ). Longest acute setae on fore femora as long as half of femur width; long setae not arranged in line, restricted to outer surface. Tarsi and claws typical. Tergal segments covered with very short setae; row of posterior margin with slightly longer, blunt setae with different length, longest nearly reaches 1/3 of segment length ( Figs. 16 , 18A ). Cercal segments with relatively dense and moderately long, erect setation; setae sparser and shorter on the basal segments; setae of apical whorl of thicker and distinct except for last 9 segments ( Figs. 16 , 18D–E ). Cercomeres with intercalary setae-like indistinct fine hairs, as long as the segment width.

Material examined. CHINA: Guangxi, Nanning City, Wuming County, Liangjiang Town , Neichao , Longmugou River , 186.0– 221.7 m, 23°29′57" N, 108°21′21" E, 21 May 2020, Raorao Mo, Yan Lai, Yingying Mo leg.: 10 male and 7 female adults; 5 pharate male larvae, 14 ultimate larvae, 7 early instar larvae ( HIST) ; same locality and collecters as above, 194.2–209.3 m, 23°29′33” N, 108°21′29” E, 19 May 2020: 2 male and 1 female adults ( HIST) ; Guangxi, Laibing City, Jinxiu Yao Autonomous County, Dayaoshan National Natural Reserve , Yinshan Park , 1129.3 m, 24°10’ 7’’ N, 110°14’38” E, 10 June 2020, Raorao Mo, Yan Lai, Qingcheng Yang et al. leg.: 2 male and 8 female adults ( HIST) ; Guangdong, Maoming City, Xinyi City, Dacheng Town , Yunkaishan National Natural Reserve , the bridge next to the security office at the entrance to the reserve, 966 m, 22º16’34” N, 111º11’43” E, 4 October 2018, light trap, Raorao Mo, Fengping Qin, Wei Liu et al. leg.: 3 female adults ( HIST) ; same locality and collecters as above, 987.6 m, 22º16’34” N, 111º11’43” E, 5 October 2018: 5 male adults ( HIST) ; Guangdong, Guangzhou Cith, Conghua District, Shimen National Forest Park, 331.0 m, 23°37’21’’ N, 113°48’19” E, 4 October 2019, Raorao Mo, Fengping Qin, Wei Liu et al. leg.: 1 male and 1 female adults (mating); 1 male and 1 female adults ( HIST) ; same locality and collecters as above, 114.6 m, 23°37’24’’ N, 113°43’41” E, 2–4 October 2019, light trap: 3 female adults ( HIST) .

Distribution. Widely distributed in southern China (Fujian Province, Guangdong Province and Guangxi Zhuang Autonomous Region).

Affinities. Among the few known larvae of Indonemoura , the larva of I. scalprata is the most closely resembles I. quadrispina Mo, Wang, Yang, Li & Murányi, 2019 due to having very short tergal setation and no distinctive co- lour pattern. The larvae of the two species can be distinguished on the basis of more dense and erect cercal setation of I. scalprata .

Remarks. The above description and illustration of both sexes of adult Indonemoura scalprata are identical to the original description. Mating adults were collected from Shimen National Forest Park of Guangzhou in 2019, and the larvae and adults of the species were simultaneously collected from Longmugou River of Nanning of southern Guangxi Zhuang Autonomous Region. Mature male larvae are easily associated to male adults of I. scalprata by the external genitalia and habitus. However, the pharate or near pharate female larvae were not found amongst the numerous larvae.

Figures

FIGURE 15. Indonemoura scalprata (Li & Yang, 2007) (A–D male, E–F female) A. Head and pronotum, dorsal view. B. Terminalia, ventral view. C. Terminalia, lateral view. D. Terminalia, dorsal view. E. Terminalia, ventral view. F. Terminalia, ventral view. Scale bars: 0.1 mm.

FIGURE 16. Indonemoura scalprata (Li & Yang, 2007) A. Pharate male larva. B. Ultimate male larva. C. Early instar larva. Scale bars: 1 mm.

FIGURE 17. Indonemoura scalprata (Li & Yang, 2007) (Pharate male larva). A. Head and Pronotum, dorsal view. B. Right hind leg, outer face. C. Right hind leg, inner face. Scale bars:1 mm.

FIGURE 18. Indonemoura scalprata (Li & Yang, 2007) (Pharate male larva). A. Abdomen, dorsal view. B. Abdomen, ventral view. C. Abdomen, lateral view. D. Right cercus, dorsal view. E. Basal half of right cercus, dorsal view. Scale bars: 0.5 mm.