Filchneria dongruihangi Chen 2020, sp. nov.
Creators: name: Chen, Zhi-Teng
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlodidae
Filchneria
Filchneria dongruihangi

description: <i>Filchneria dongruihangi</i> sp. nov. Figs. 2–10. <b>Male</b> (Figs. 2–8). Body length ca. 14 mm, generally brown (Fig. 2). Head (Fig. 3) mostly brown; ocellar area with a diamond-shaped pale spot; lateral areas of the anterior ocellus with two transverse calluses; anterior of the head with a sub-trapezoidal pale area, expanding anteriorly; posterior area of the head pale. Antenna brown and slender, subequal in length to the abdomen. Pronotum (Fig. 3) subquadrate with obtuse corners, generally brown except for the pale, median band, the band constricted twice near anterior and posterior ends. Mesothoracic furcasterum branches reaching posterior of the furcal pits. Brachypterous (Figs. 1, 4 A–B), wing membrane subhyaline, veins pale brown; forewings length ca. 3.5 mm, hindwings length ca. 4 mm. In the forewing, the apical venation includes a small marginal net; anal area with two veins. In the hind wing, the apical net small and simple; anal area large, with eight anal branches. Legs mostly pale, joints darker. Abdominal segments generally brown (Fig. 5). Sterna 1 completely fused with metathorax. Segments 1–3 divided into distinct terga and sterna. Posterior of terga 7–9 slightly humped and hairy; tergum 7 with two sparse patches of sensilla basiconica near posterior margin; tergum 8 with a subtriangular membranous median area which covered with several moderate spines; two kidney-shaped light spots present lateral to the membrane; posterior half of tergum 8 with two dense patches of stout sensilla basiconica (Fig. 6 A–B). Tergum 9 with membranous median area and lateral spots similar to tergum 8, near posterior margin with two dense patches of stout sensilla basiconica. Anterior half of tergum 10 with a membranous median area, scattered with sparse short spines; posterior half of tergum 10 moderately upcurved, covered by dense sensilla basiconica. Sensilla basiconica on terga 8–10 with similar shapes and sizes. The paraproct sclerite prolonged(Fig. 7 A–B), wide and sclerotized basally, then constricted near base, apical half with a weakly sclerotized, subtriangular anterior expansion and a dark, finger-shaped apical projection, the anterior expansion and the apical projection divided by an obscure sinuous boundary; inner margin of each paraproct sclerite not connected basally; the eversible paraproct lobe resembling a "drumstick" (Fig. 7 C–F), with a broad basal cushion which covered by dense hairs and several short spines, then constricted near base and enlarged apically, surface covered with dense wrinkles and short hairs. The aedeagus (Fig. 8) completely membranous, with a low dorsomedial lobe and several small apical lobes (Fig. 8 A–D). From ventral and lateral views, the partially everted aedeagus of another male specimen apically with three ear-shaped large lobes surrounding a small medial lobe (Fig. 8 E–H). Cerci generally pale, subequal in length to the abdomen, each segment apically fringed with stout spines and long bristles. <b>Female</b> (Fig. 9). Body length ca. 17 mm, color pattern similar to the male (Fig. 9 A–B). Macropterous; forewing length 14 mm, hindwing length 12 mm. In the forewing, the venation includes a small net near the apex; anal area with four branches. In the hind wing, the apical net small and simple; anal area large, with 11 anal branches. Sternum 8 with two anterolateral sclerites, anteromedially with a subtriangular pale area. Subgenital plate (Fig. 9C) originating from half-length of sternum 8, covering half of sternum 9. The subgenital plate broad and weakly sclerotized, posterior margin mostly truncate, with a shallow median notch, the notch comprised of three small incisions, anterior area, median line and posterior margins pale, other areas weakly sclerotized. Sternum 9 with two dark spots laterally connected with lateral surfaces of the segment. Sternum 10 pale, unmodified. <b>Type material.</b> Holotype male, China: Heilongjiang Province, Qiqihar City, Liuyuan Park, Nenjiang River (Fig. 10), 47.35992625 N, 123.90812588 E, 145 m, April 25, 2020, Rui-Hang Dong, Ming-Wei Li (ICJUST). Paratypes: two males and one female, same locality and data as holotype (ICJUST). <b>Etymology.</b> The species is named after Mr. Rui-Hang Dong for collecting the specimens. <b>Diagnosis.</b> The nearly truncate posterior margin of the female subgenital plate can easily separate the new species from almost all eastern Asian congeners which have distinctly bilobed subgenital plates with deep posteromedial notch (Klapálek 1901, Šámal 1935, Navás 1936, Wu 1938, Zhiltzova 1971, Teslenko <i>et al</i>. 2010, Chen 2019a, b). The female subgenital plate of <i>F. tau</i> from Shaanxi Province of China is posteriorly truncate and with two posterolateral extensions (see fig. 20 in Klapálek 1912), but in <i>F. dongruihangi</i>, the plate has a shallow posterior notch and has no posterolateral extensions. The apically enlarged eversible paraproct lobe is similar to that of <i>F. songi</i>, but the broad basal cushion is absent in <i>F. songi</i>, and the chaetotaxy of terga 7–10 of the male differs between the two species (Chen 2019a). Aedeagus of <i>F. dongruihangi</i> seems similar to <i>F. wusuensis</i> and <i>F. mongolica</i> in having several small apical lobes, but the shapes of paraproct sclerite and female subgenital plate of <i>F. dongruihangi</i> apparently differ from the two latter species (Zwick 1997, Teslenko <i>et al</i>. 2010, Chen 2019b). In <i>F. mongolica</i>, the paraproct sclerite has a clear anterior margin along the finger-shaped apical projection (Fig. 7F); the eversible paraproct lobe is spinulose (Fig. 7F); the female subgenital plate is bilobed with a U-shaped deep notch (see fig. 9 in Teslenko <i>et al</i>. 2010). However, in <i>F. dongruihangi</i>, the paraproct sclerite has an obscure sinuous boundary separating the anterior expansion and the posterior projection (Fig. 7 A–B); the eversible paraproct lobe has dense wrinkles and short hairs instead of spinules (Fig. 7 C–E); the female subgenital plate is entire with a nearly truncate posterior margin (Fig. 9C). <b>Remarks.</b> The unnamed <i>Filchneria</i> species illustrated in Chen (2019b) was collected also from Heilongjiang Province. The two species have very similar pattern on head, pronotum and male terga 8–10, showing similar patches of sensilla basiconica on male terga 8–10 (Chen 2019a). The two species are also somewhat similar in the shape of paraproct sclerite and eversible paraproct lobe. However, that single male is insufficient for an accurate specific comparison, its female is needed to confirm its identity.
description: Published as part of <i>Chen, Zhi-Teng, 2020, Description of a new Filchneria (Plecoptera: Perlodidae), with supplementary illustrations for Taenionema japonicum (Plecoptera: Taeniopterygidae) from northeastern China, pp. 350-364 in Zootaxa 4808 (2)</i> on pages 351-358, DOI: 10.11646/zootaxa.4808.2.7, http://zenodo.org/record/3933592
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