Filchneria wusuensis, Chen, 2019

Chen, Zhi-Teng, 2019, A new brachypterous Filchneria and two new generic records for China, Arcynopteryx and Pictetiella (Plecoptera: Perlodidae), Zootaxa 4679 (3), pp. 511-526 : 512-515

publication ID	https://doi.org/ 10.11646/zootaxa.4679.3.5
publication LSID	lsid:zoobank.org:pub:0F07C754-7295-4406-9BC1-8C0AE16943CA
DOI	https://doi.org/10.5281/zenodo.4759675
persistent identifier	https://treatment.plazi.org/id/03E8C610-FF8D-FFD7-88FD-FDB1FA950DC1
treatment provided by	Plazi
scientific name	Filchneria wusuensis
status	sp. nov.

Treatment

Filchneria wusuensis View in CoL sp. nov.

Figs. 1–7 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 View FIGURE 7 .

Male ( Figs. 1–4 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 ). Body length ca. 19.0 mm, generally pale brown. Head ( Fig. 1 View FIGURE 1 ) mostly brown; ocellar area with a rounded pale spot; lateral areas of the anterior ocellus with two pale transverse bands; anterior of the head with a subquadrate pale area; posterior area of the head pale. Antenna brown and slender, slightly shorter than the abdomen. Pronotum ( Fig. 1 View FIGURE 1 ) subquadrate with obtuse corners, generally brown except for the pale, trapezoidal median band. Brachypterous ( Figs. 1 View FIGURE 1 , 2 View FIGURE 2 ), wing membrane subhyaline, veins pale brown; forewings length ca. 6.0 mm, hindwings length ca. 5.0 mm. Legs generally pale, joints darker.

Abdominal segments generally pale brown ( Fig. 1 View FIGURE 1 ). Sterna 1 completely fused with metathorax, medially with four small pale spots in a brown circular area. Sterna 2–7 each with four small median pits and two lateral spots, the pits and spots less distinct on sterna 8–9. Posterior of terga 7–9 slightly humped and hairy; tergum 7 with two sparse patches of short sensory scales near posterior margin; tergum 8 with two dense patches of stout sensilla basiconica at posterior half, and with several long bristles on the membranous median area; posterior half of tergum 9 membranous, laterally with two dense patches of larger sensilla basiconica, anterior half of each patch also with long bristles ( Figs. 3 View FIGURE 3 , 4 View FIGURE 4 ). Tergum 10 strongly upcurved, anterior surface covered with tiny sensilla basiconica. The paraproct ( Fig. 3 View FIGURE 3 ) weakly sclerotized at basal half; the eversible paraproct lobe near cylindrical from caudal view, apex papilla shaped. The aedeagus ( Fig. 3 View FIGURE 3 ) completely membranous, with four conspicuous pairs of lateral lobes and a small subapical median lobe. Cerci slender, near half-length of the abdomen, generally pale brown, each segment apically fringed with thick bristles.

Female ( Figs. 5–7 View FIGURE 5 View FIGURE 6 View FIGURE 7 ). Wings shortened ( Figs. 5 View FIGURE 5 , 6 View FIGURE 6 ); body length ca. 24.0 mm, color pattern darker than male. Sternum 8 weakly sclerotized ( Fig. 7A View FIGURE 7 ). Subgenital plate ( Fig. 7A View FIGURE 7 ) originating from posterior of sternum 8, covering half of sternum 9. The subgenital plate broad and bilobed, median area with a triangular patch of long bristles; each lobe short and broad, subtriangular with obtuse apex. Two V-shaped sclerites present anterior to the subgenital plate. Sternum 9 with two elliptical lateral spots. Sternum 10 pale, unmodified.

Egg ( Fig. 7 View FIGURE 7 ). Elliptical in lateral view, without longitudinal ridges. Collar mushroom-shaped, outer surface membranous and scattered with small tubercles, inner surface scattered with small dark tubercles. Pedicel cylindrical, covered with dark tubercles. Two transverse rows of 7–10 conspicuous micropyles present at half length of the egg. Chorion surface rough.

Type material. Holotype male, China: Xinjiang Uygur Autonomous Region, Wusu City, Bayingou River , 44.00 N, 84.95 E, 1700 m, July 15, 2011, C.F. Zhou GoogleMaps . Paratype female, same locality and data as holotype (ICJUST).

Etymology. The species is named after the type locality, Wusu City.

Remarks. The new species is most similar to F. mesasiatica Zhiltzova, 1971 , a congener known from Kyrgyzstan ( Zhiltzova, 1971). However, F. wusuensis differs from F. mesasiatica by the following characters: (a) wing venation of female more complicated than F. mesasiatica , especially the RP vein, which with a basal origin from RA instead of the basal one-third origin in F. mesasiatica ; (b) the paraproct lobe near cylindrical from caudal view and apically with a small inner lobe, which is triangular and has no apical lobe in F. mesasiatica ; (c) aedeagus with more small lobes, especially the pointed lateral lobes and the subapical median lobe, which are absent in F. mesasiatica ; (d) the dark lateral sclerites posterior to the female subgenital plate of F. wusuensis are almost obscure in F. mesasiatica ; sternum 10 is unpigmented in F. wusuensis but is pigmented in F. mesasiatica (see Plate 2 in Zhiltzova 1971). In addition, the egg shape of F. wusuensis is diagnostic without obvious longitudinal ridges as occurring in F. mesasiatica , F. mongolica and F. songi Chen, 2019 ; the transverse rows of conspicuous micropyles of F. wusuensis are absent in F. mesasiatica and F. songi ; the small dark tubercles on inner margin of the collar in F. wusuensis are absent in F. mesasiatica (see fig. 7 in Zwick 1997, fig. 12 in Teslenko et al. 2010 and fig. 7 in Chen 2019).