Perlodinella epiproctalis ( Zwick, 1997 )

Huo, Qing-Bo, Du, Yu-Zhou, Zwick, Peter & Murányi, Dávid, 2022, Notes on Perlodinella Klapálek, 1912 (Plecoptera: Perlodidae) with a new species and a new synonym, Zootaxa 5162 (4), pp. 378-396 : 390-391

Perlodinella epiproctalis ( Zwick, 1997) (comb. nov.)

Rauserella epiproctalis: Zwick, 1997: 489 .

Rauserodes epiproctalis: Zwick, 1999: 168 ; Yang & Li, 2018: 52; Huo, Chen, Kong & Du, 2020: 455 .

Adult habitus: See Zwick (1997, 1999) and Huo et al. (2020).

Nymph: Mature male body length 17–20 mm (n = 3). Dorsum gray to olive green with some pale patterning; ventrally paler grey ( Figs. 24–25 ). Body covered by short colorless hairs. Head with a large pale spot in front of the anterior ocellus extending onto the clypeus; M-line indistinct; interocellar area brown with small pentagonal, central pale spot, closed posteriorly; occiput with a pair of oval pale spots around the epicranial stem bordered by sinuate brownish rows behind each eye ( Fig. 24A ). Submental gills are short ( Fig. 24B ). Mandible bidentate, with 2 apical teeth and 3 subapical teeth; a patch of 15–18 hairs present ventral to the subapical teeth ( Fig. 25A ). Lacinia bidentate, apically narrow, basal half expanded; 12–14 submarginal setae present; 2–3 setae present ventral to the base of the subapical tooth and 2–3 setae at the juncture of the apical teeth ( Fig. 25B ). Paraglossae flat and fingerlike; glossa wide and semicircular, apex slightly truncated, with thick fine hairs ( Fig. 25C ). Thoracic segments rectangular with wide, pale, median stripes. Male wingpads very short. Legs with few scattered brown spinules on surface ( Fig. 24A ). Abdominal terga with two rows of large, oval, pale paramedial spots; spots are indistinct on tergum 10 ( Fig. 24C–D ). All abdominal segments have a few short, stout spinules that become more numerous on the sterna 6–10. Epiproct is already visible on mature nymphs ( Fig. 25D ). Paraprocts short, apex rounded ( Fig. 24C–D ). Cerci with dorsal fringe of fine, silky, colorless hairs; each cercal segment with an apical whorl of short brown setae ( Fig. 25E ).

Mature female body length 22–25 mm (n = 5). Coloration and morphology similar to male ( Fig. 26 ). Wingpads length regular ( Fig. 26A ). A horizontal sclerite is present on the posterior margin of sternum 8 of female ( Fig. 26D ).

Egg: General color dark brown to black. Subglobular, with three obscure longitudinal ridges. Collar slender and more sclerotized, cylindrical with a broad base. Anchor mushroom-shaped, evenly covered with small globular bodies. Each side of the egg with 5-6 short transverse row of micropyles ( Fig. 27 ).

Material examined: The same collection sites were recorded in Huo et al. (2020); 8 males, 4 females, 10 nymphs, China, Qinghai Province, Haibei Tibetan Autonomous Prefecture, Menyuan Hui Autonomous County, Laohugou , 3549 m, 101.582778°E, 37.585556°N, 2021-VII-4, leg. Huo Qing-Bo, Zang Hao-Ming, Shen Rong-Rong ; 11 males, 9 females, 8 nymphs, Qinghai Province, Qilian County, Longkong , 3425 m, 100.680833°E, 38.067500N, 2021-VII-5, leg. Huo Qing-Bo, Zang Hao-Ming .

Distribution: China (Qinghai).

Remark: Perlodinella epiproctalis is widespread in most of the basin of Datong River, western Qilian Mountains (Qilian, Menyuan and Datong counties), and is also the only Perlodinella species known to emerge in this area during July and August.

Figures

FIGURE 24. Perlodinella epiproctalis (Zwick, 1997), male nymph. A–B: head and thorax, dorsal and ventral view; C–D: abdomen, dorsal and ventral view.

FIGURE 25. Perlodinella epiproctalis (Zwick, 1997), male nymph. A: mandible; B: lacinia; C: labium; D: epiproct; E: cercal segments.

FIGURE 26. Perlodinella epiproctalis (Zwick, 1997), female nymph. A: head and thorax, dorsal view; B–C: abdomen, dorsal and ventral view; D: sterna 8–10, ventral view.

FIGURE 27. Perlodinella epiproctalis (Zwick, 1997), egg. A: lateral view; B: top view; C: top view, anchor removed; D: sketch.