Protracheoniscus major (Dollfus) (Figures 1 (D–F), 2) Metoponorthus major Dollfus in Dyduch 1903: 64. Protracheoniscus asiaticus: Strouhal 1929: 7, figs. 1–8; Verhoeff 1930: 108, figs. 1–3. Protracheoniscus major: Schmalfuss 2003: 219; Chen 2000: 259; Chen 2009: 523, fig. 321. Material examined 7 specimens, CHINA: Gansu Province, Tanchang County, Mingjiang Avenue, Guan’e Bridge (34.0290°N, 104.3896°E), 1740 m, 30 March 2024, leg. Yuan Xiong and Yifei Yu, nos. 20240330007F–20240330011F; 5 spms, Gaotai County, Yueyahu Park (39.3765°N, 99.7985°E), 1350 m, 27 September 2023, leg. Tianyun Chen, Jiabo Fan and Yiying Zhao, nos. 20230927206, 20230927301–20230927304; 3 spms, Lanzhou, Qilihe District, Shifogou National Forest Park (35.9368°N, 103.8691°E), 1880 m, 22 September 2023, leg. Tianyun Chen, Jiabo Fan and Yiying Zhao, nos. 20230922201–20230922203; 6 spms, Heilongjiang Province, Harbin, Xiangfang District, Xiangfang Avenue (45.7239°N, 126.6785°E), 30 December 2022, leg. Junjie Zong, no. 20221230001; 4 spms, Jilin Province, Ji’an, Koguryo Archaeological Site Park (41.1210°N, 126.1845°E), 210 m, 12 September 2020, leg. Chao Jiang, no. 20200912001; 3 spms, Liaoning Province, Xinbin Manchu Autonomous County, Yongling Town (41.7193°N, 124.7979°E), 310 m, 07 September 2021, leg. Chao Jiang, nos. 20210907034–20210907036; 1 spm, Chaoyang, Longcheng shangzhi Park (41.5891°N, 120.4302°E), 180 m, 07 September 2021, leg. Chao Jiang, no. 20210907004; 1 spm, Huanren Manchu Autonomous County, Huanren Town, Zhangyue Park (41.2600°N, 125.348°E), 270 m, 04 September 2021, leg. Chao Jiang, no. 20210904035; 1 spm, Qinghai Province, Huangnan Zang Autonomous Prefecture, Jianzha County, Binhe Park (35.9420°N, 102.0456°E), 2020 m, 21 September 2023, leg. Tianyun Chen, Jiabo Fan and Yiying Zhao, no. 20230921001; 7 spms, Inner Mongolia Autonomous Region, Horqin District, Tielu Street, Tongliao Forest Park (43.6043°N, 122.2958°E), 180 m, 05 July 2024,leg. Yuan Xiong and Yifei Yu, nos. 20240705001–20240705005; 24 spms, Ningxia Hui Autonomous Region, Yinchuan, Xixia District, Gunzhongkuo Scenic area (38.5662°N, 106.0354°E), 1160 m, 24 September 2023, leg. Tianyun Chen, Jiabo Fan and Yiying Zhao, nos. 20230924201–20230924224; 7 spms, Shanxi Province, Jinzhong, Taigu Service area (37.4930°N, 112.7775°E), 860 m, 02 September 2023, leg. Tianyun Chen, Jiabo Fan and Yuan Xiong, nos. 20231102401–20231102407; 2 spms, Xinjiang Autonomous Region, Tacheng, Emin County, Lamazhao Township (46.2484°N, 84.3506°E), 26 Septerber 2022, leg. Sheng Du, nos. 20220426101, 20220426102; 2 spms, Xizang Autonomous Region, Bomi County, Songzong Town (29.7469°N, 96.0866°E), 3010 m, 14 October 2020, leg. Chao Jiang, nos. 20201014001, 20201014002; 6 spms, Lang County, Yajiang Park (29.0488°N, 93.0713°E), 3060 m, 10 July 2021, leg. Chao Jiang, nos. 202107100027–20210710032; 9 spms, Gongga County, Jiazhulin Town (29.2885°N, 90.8958°E), 3560 m, 10 July 2021, leg. Chao Jiang, nos. 20210710019–20210710026; 10 spms, Shannan, Naidong district, Shannan Hotel (29.2379°N, 91.7705°E), 3550 m, 05 July 2021, leg. Chao Jiang, nos. 20210705010–20210705019; 14 spms, Jiacha County, Anrao Town (29.142°N, 92.583°E), 3240 m, 08 July 2021, leg. Chao Jiang, nos. 20210708003–20210708012. Distribution China (Beijing, Hebei, Heilongjiang, Qinghai, Inner Mongolia, Jilin, Liaoning, Shanxi, Xinjiang, Xizang); from south-eastern Germany to central Asia. Remarks This species has phenotypic variations in the length of uropodal exopod, which varies from 2 to 5 times as long as protopod (Figure 1 (D,)).

Published as part of Zhong, Jing, Li, Weichun & Jiang, Chao, 2025, The woodlouse genus Protracheoniscus (Isopoda: Agnaridae, pp. 2361-2381 in Journal of Natural History 59 (37 - 40) on pages 2372-2373, DOI: 10.1080/00222933.2025.2552253, http://zenodo.org/record/18022403