Alloperla joosti Zwick, 1972

Rehman, Abdur, Huo, Qing-Bo & Du, Yu-Zhou, 2025, Synopsis of Chinese Alloperla Banks, 1906 (Plecoptera, Chloroperlidae), with description of a new species, ZooKeys 1243, pp. 365-375 : 365-375

Alloperla joosti Zwick, 1972

Alloperla joosti Zwick, 1972: 35 ; Ham 2008: 186; Teslenko 2009; Judson and Nelson 2012: 24; Huo et al. 2022: 9.

Material examined. • 5 males, 30 females, China: Inner Mongolia Autonomous Region, HulunBuir city, Oroqen Zizhiqi, Dayangshu town , 405 m, 49.7086°N, 124.5899°E, 2023.VI.3, leg. Zhu Ya-Fei & Yang Xiao • 4 females ( ICYZU), China: Heilongjiang Province, Da Hinggan Ling Prefecture, Tahe County , 364 m, 52.3071°N, 124.7051°E, 2023.VII.30, leg. Zhu Ya-Fei & Yang Xiao.

Supplementary description. Male. Forewing length: 8.0– 8.5 mm; hindwing length: 7.0– 7.5 mm. Body greenish in field, pale yellow in ethanol. Head rounded, pale brown without markings or spots. Compound eyes blackish, ocelli gray with black margins. Antennae brown, with pale brown basal segments. Wings macropterous, hyaline. Meso- and metanota with faint pigmentation, no markings or stripes (Fig. 6 A ). Abdominal terga with prominent dorsal stripe originating on segment 1, continuing through segment 7. Epiproct recurved anteriorly, slightly swollen at base, medially constricted, with black medial stripes anteriorly; uniformly broad toward apex, apex rounded, length approximately four times width (Fig. 6 B ). Ventrally, epiproct has a row of long spines along margin, medially constricted (Fig. 7 A – C ). Cerci dark brown, generally brown, small basal segments covered with long setae.

Female. The female subgenital plate is small and V-shaped, extending only to the middle part of sternum 9. The plate gradually slopes to an abrupt point, forming a triangle with a broad base (Fig. 8 A, B ). The cerci are pale brown.

Distribution. China (Inner Mongolia Autonomous Region and Heilongjiang Province), Mongolia, Russia, and South Korea.

Remarks. Huo et al. (2022) newly reported this species in China from Xiaodong Gou Village, Benxi County, Liaoning Province, based on female specimens, without describing the male. Here, we provide the first description of the male specimens of this species from China. The species was described initially from magnolia in Russia ( Judson and Nelson 2012; Teslenko and Zhiltzova 2009), but neither description included the ventral view of the epiproct ( Judson and Nelson 2012: figs 96–98; Teslenko and Zhiltzova 2009: fig. 557), which is essential for identifying this species because it possesses a row of spines in the ventral view. We offer a revised description with clear color images of both dorsal and ventral views to avoid future misidentifications. The ventral view of the epiproct bears a distinct row of spines (Fig. 7 A, B ). Additionally, we observed variation in the subgenital plate among some female individuals; some have a short, sloped structure while others have a little longer extension. Earlier literature indicates that the figures provided for the female subgenital plate in Judson and Nelson (2012) and Teslenko and Zhiltzova (2009) differ from each other, suggesting that variation in the female subgenital plate is common in this species. The type locality of this species is Arkhangai Aimag, Somon Chencher at Urd-Tamir Gol, Mongolia ( Judson and Nelson 2012).

Figures

Figure 6. Alloperla joosti Zwick, 1972 Male. A. Head and prothorax, dorsal view; B. Terminalia, dorsal view; C. Terminalia, dorsolateral view.

Figure 7. Alloperla joosti Zwick, 1972 Male. A. Epiproct, lateral view; B. Epiproct lateral view; C. Epiproct, dorsal view.

Figure 8. Alloperla joosti Zwick, 1972 female. A. Head and prothorax, dorsal view; B. Terminalia ventral view.