Amphinemura hamiornata Li & Yang, 2008

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 : 80-82

Amphinemura hamiornata Li & Yang, 2008

( Figs. 2–4 )

Amphinemura hamiornata Li & Yang, 2008: 211 . Holotype male (CAU), China, Guangxi, Shangsi, Shiwandashan. Amphinemura hamiornata: Yang, Li & Zhu, 2015: 212 .

Amphinemura hamiornata: Yang & Li, 2018: 10 .

Description of female adult. Forewing length 6.0– 6.8 mm. Sternum VII produced in a broad circular pregenital plate, covering anterior half of subgenital plate; the plate is pale, slightly bulging in lateral view ( Fig. 2A ). Sternum VIII forms bicolored, rectangular subgenital plate with wavy posterior margin, short and as wide as half of the segment width; medial portion weakly sclerotized, with inner genitalia seen by transparency; posterior margin medially divided into short lobes by small triangular notch, lobes concave ( Fig. 2B ). Paragenital plate paired and brown, medium sized and rounded elliptical, partly covered by posterolateral edge of subgenital plate. Sternum IX trapezoidal, in ventral aspect with indistinct anterior indentation. Paraproct short and brownsih, apex widely rounded; cerci short and brownish.

Inner genitalia ( Fig. 2C ): Inner sclerite is medially separated into complex sclerites located anteriorly to the subgenital plate; anterior part of the sclerites are rounded, with a sharp triangular inner projection pointing caudad, posterior part is smaller and rectangular. Between the sclerites is a membranous tunnel with a funnel-shaped median sclerite leading to spermathecal ductus. The genital opening is wide and connected to the paragenital plates’ inner edge.

Description of mature larva. Measurements: Body length: 5.2 mm (excluding antennae and cerci). Habitus ( Fig. 3 ). Body relatively slender, general color brown without any distinct pattern; abdomen evenly brown, tibiae slightly darker. Antennae brown, scape and pedicel slightly paler. Legs moderately long, width of hind femora> 1/3 of their length. The pronotum rectangular with rounded corners, wider than long. Cervical gills much longer than fore coxa, inner gills with 5, outer with 6 branches. Wing pads more than twice as long as the corresponding segments. Abdomen relatively slender, integument light matt brown, first 5 abdominal segments divided by pleura. Male larva unknown. Sternum VIII of female larva with a moderately deep posteromedial notch ( Fig. 4E ). Cerci long, with 27 cylindrical segments; length of the last 3 segments is> 5X of its width.

Setation ( Fig. 4 ). Head, antennae and palpi with dense short setae. Pronotum covered with very short setae; marginal setae distinct and blunt, row continuous but setae longer in the corners, corners have setae as long as 1/12 of pronotum width ( Fig. 4A ). Setae on mesonotum and metanotum slightly longer than longest marginal setae on pronotum; wing pads with short setae. Femora mostly with short setae on the lateral surface, sparse strong and blunt setae arranged unevenly on the whole dorsal surface on mid and hind femora, fore femora with strong setae arranged in a median cluster; sparse, long swimming hairs also present on the dorsal surface. longest setae of all femora are less than half of the corresponding femur width. Tibiae bear strong but relatively short setae in the whole length, and sparse but distinct swimming hairs longer than tibia width ( Fig. 4C ). Tarsi and claws normal. Tergal segments covered with variable but mostly short setae; row of posterior margin are of slightly longer, blunt setae with different length, longest reach 1/3 of segment length; setae of the posterior margin are erect in lateral view and a few thin, erect hairs can be seen on each segments ( Figs. 4C–D ). Cercal segments with dense and long setation; setae sparser and shorter on the basal and apical segments. Cercomeres with strong setal whorls; medial cercomeres with an apical whorl of 8–10 blunt setae that are slightly shorter than segment length and tilted in less than 45° degree; distinct intercalary setae are also blunt, 1–3 erect swimming hairs present on most cercomeres.

Material examined. CHINA: Guangxi, Fangchenggang City, Shangsi County, Shiwandashan National Forest Park, Pearl River below tourist route bridge, 315 m, 21°54’07” N, 107°54’17” E, 29 March 2015, Jenő Kontschán, Junyi Li, Shan Li, Weihai Li, Dávid Murányi, Guoquan Wang leg.: 1 pharate female larva, 6 male and 5 female adults ( HNHM) ; same locality and collectors, 27 March 2015: 5 male and 4 female adults ( HNHM) ; forest seep by the Pearl River , 265 m, 21°54’13” N, 107°54’14” E, 29 March 2015, same collectors: 1 male and 1 female adult ( HNHM) ; light trap on Yunwu Hotel balcony above Pearl River , 295 m, 21°54’18” N, 107°54’12” E, 26–29 March 2015, same collectors: 2 female adults ( HNHM) ; small forest brook, 365 m, 21°50’34” N, 107°51’48” E, 28 March 2015, same collectors: 1 male adult ( HNHM) .

Distribution. China, Guangxi Zhuang Autonomous Region, seems to be restricted to the lower elevations of the Shiwandashan Mountains.

Affinities. The larva of Amphinemura hamiornata has no distinctive color pattern, but combination of generally blunt setation, presence of long setae on the whole dorsal surface of hind femora, short tergal setation, and long, dense cercal setation distinguish it from the few known Chinese congeners. The female of A. hamiornata is generally similar to other known females of the sinensis group; distinction must rely on the shape of subgenital plate and may be confirmed also by the examination of inner sclerite.

Figures

FIGURE 2. Amphinemura hamiornata Li & Yang, 2008 (female) A. Terminalia, lateral view. B. Terminalia, dorsal view. C. Female inner genitalia, dorsal view. Scale bars: 0.5 mm.

FIGURE 3. Amphinemura hamiornata Li & Yang, 2008 (female larva habitus) A. Dorsal view. B. Ventral view.

FIGURE 4. Amphinemura hamiornata Li & Yang, 2008 (female larva) A. Head and pronotum, dorsal view. B. Gills, ventral view. C. Hind leg, lateral view. D. Abdominal segments I–VIII and hind femora, dorsal view. E. Terminalia, ventral view. F. Cercus, dorsal view.