Amphinemura bifascia Mo, Wang, Yang & Li, 2020

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 : 78

Amphinemura bifascia Mo, Wang, Yang & Li, 2020

( Fig. 1 )

Amphinemura bifascia Mo, Wang, Yang & Li, 2020a: 132 . Holotype male (CAU), China, Guangxi, Wuming , Damingshan.

Description of mature larva. Measurements: Body length: 4.8–5.2 mm (excluding antennae and cerci). Habitus as shown on Fig. 1 . Body relatively slender, general color brown, with some indistinct pattern on head and thorax; abdomen and legs evenly brown. Antennae brown, scape and pedicel slightly paler. Legs moderately long, width of hind femora <1/4 of their length. The pronotum rectangular with rounded corners, wider than long. Cervical gills much longer than fore coxa, inner gills with 6, outer with 6 or 7 branches. Wing pads> 2X as long as the corresponding segments. Abdomen relatively slender, integument light brown, first 6 abdominal segments divided by pleura. Posterior margin of sternum IX of the male larva short and narrow triangular; posteromedial portion of tergum X membranous and blunt triangular; paraprocts slightly elongated but blunt ( Fig. 1E ). Sternum VIII of female larva with a deep and distinct posteromedial notch ( Fig. 1F ). Cerci are lacking on the available larvae.

Setation ( Fig. 1 ). 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 1/18 of pronotum width ( Fig. 1A ). Setae on mesonotum and metanotum shorter than longest marginal setae on pronotum; wing pads with short setae besides marginal ones. Femora with variable, mostly short setae, but a cluster of longer and acute setae present in the dorsoapical third; longest setae of all femora are more than half of the corresponding femur width. Tibiae bear strong and long setae in the whole length, and sparse, indistinct swimming hairs as long as tibia width ( Fig. 1B ). Tarsi and claws normal. Tergal segments covered with scarce and short setae; row of posterior margin are of longer, thicker, mostly blunt setae with different length, longest not reach half of segment length; setae of the posterior margin are not erect in lateral view but a few thin, erect hairs can be seen on each segments ( Figs. 1C–D ). Cerci are lacking on the available larvae.

Material examined. CHINA: Guangxi, Nanning City, Wuming County, Damingshan National Nature Reserve , inflow stream above Dragon Lake , 1225 m, 23°29’45” N, 108°26’14” E, 22 March 2015, Jenő Kontschán, Junyi Li, Shan Li, Weihai Li, Dávid Murányi, Guoquan Wang leg.: 1 pharate female larva, 1 male and 2 female ultimate larvae ( HNHM) .

Distribution. China, Guangxi Zhuang Autonomous Region, seems to be restricted to the plateau of the Damingshan Mountains.

Affinities. The larva of Amphinemura bifascia has no distinctive color pattern, but combination of generally short setation and presence of distinct setae clusters on all femora distinguish it from the few known Chinese congeners. Unfortunately, specific characters of the cerci remained unknown.

Figures

FIGURE 1. Amphinemura bifascia Mo, Wang, Yang & Li, 2020 (larva) A. Head and pronotum, dorsal view. B. Hind leg, lateral view. C. Abdominal segments I–VII and hind femora, dorsal view. D. Abdominal segments I–VIII. E. Male terminalia, ventral view. F. Female terminalia, ventral view.