Atractides (Atractides) menyuanensis Zhang, Li & Guo sp. nov. urn:lsid:zoobank.org:act: C836E7CF-0A50-4334-AA1D-DDE500DDBCF8 Figs 6–8 Diagnosis Dorsal muscle attachment unsclerotized. I-L-5 longish, S-1 close to S-2. I-L-6 curved. Ac in an obtuse triangle; V 1 separated from V 2. P-2 ventral margin slightly convex; P-3 ventral margin nearly straight; two long hairs on the ventral surface of P-4 near the base, sword seta near the base. Ac in a weakly curved line in female. Etymology The new species is named after the name of Menyuan Hui Autonomous County where the specimens were collected. Type material Holotype CHINA • ♂; Qinghai Province, Haibei Tibetan Autonomous Prefecture, Menyuan Hui Autonomous County; 37°31′31′′ N, 101°21′09′′ E; 2427 m a.s.l.; 29 Jul. 2020; Hai-Tao Li leg.; running water; GUGC, Slide No. QH-HY-2020072901. Paratypes CHINA • 5 ♀♀; same collection data as for holotype; GUGC, Slides No. QH-HY-2020072902 to 2020072906. Description Male (n = 1) Idiosoma oval, dorsal muscle attachment unsclerotized; all slit organs visible, So 1 near the eye capsule, So 2 near L 2, So 3 at the level of D 2, So 4 at the level of D 3, So 5 on the outside of D 4 (Fig. 6A). ACG fused together and with a suture, PCG separated; apodemes from ACG not reaching to PCG; Ac in an obtuse triangle; V 1 separated from V 2; V 3 and V 4 forming a trapezoid, V 4 at the same level as the anterior of acetabular plate (Fig. 6B). Palp five-segmented; P-2 ventral margin slightly convex; P-3 ventral margin nearly straight; P-4 with numerous dorsal hairs, two long hairs on the ventral surface of P-4 near the base, sword seta near the base (Fig. 6E). I-L-5 longish, S-1 close to S-2; I-L-6 curved (Fig. 8A). Female (n = 5) Similar to male (Figs 6F, 7). Idiosoma oval; ACG and PCG significantly smaller than the male; Ac in a weakly curved line (Fig. 7B). Measurements Male (n = 1) Idiosoma L 708, W 582; coxal field L 352, Cx-III W 415, ACG IL 232, mL 92, W 323; infracapitular bay L 146; genital field L 141, Ac1–3 L 35, 35, 38; chelicera L 223; infracapitulum L 210; palp dL: P-1 37, P-2 70, P-3 63, P-4 122, P-5 31; legs segments: I-L-1 dL 57, I-L-2 dL 106, I-L-3 dL 101, I-L-4 dL 139, I-L-5 dL 182, HB 50, I-L-6 dL 102, HB 32, S-1 L 58, S-2 L 58; dL: II-L-1 57, II-L-2 95, II-L-3 93, II-L-4 135, II-L-5 158, II-L-6 157; dL: III-L-1 55, III-L-2 102, III-L-3 114, III-L-4 165, III-L-5 191, III-L-6 180; dL: IV-L-1 118, IV-L-2 138, IV-L-3 181, IV-L-4 240, IV-L-5 272, IV-L-6 217. Female (n = 5) Idiosoma L 1074 (1050–1113), W 935 (868–935); coxal field L 385 (385–432), Cx-III W 575 (550– 585), ACG IL 248 (248–299), mL 111 (111–130), W 373 (373–417); infracapitular bay L 130 (105– 163); gonopore L 168 (161–190), Ap L 157 (145–171), Ac1–3 L 38 (34–48), 39 (39–49), 37 (32–48); chelicera L 264 (253–283); infracapitulum L 215 (214–244); palp dL: P-1 46 (40–46), P-2 75 (75–86), P-3 66 (66–80), P-4 126 (121–145), P-5 37 (36–37); legs segments: I-L-1 dL 62 (62–77), I-L-2 dL 106 (106–136), I-L-3 dL 107 (107–126), I-L-4 dL 153 (151–176), I-L-5 dL 200 (200–233), HB 53 (53–59), I-L-6 dL 120 (120–132), HB 31 (31–36), S-1 L 63 (62–68), S-2 L 63 (62–69); dL: II-L-1 61 (61–72), II-L-2 93 (93–109), II-L-3 109 (98–124), II-L-4 144 (142–163), II-L-5 168 (168–204), II-L-6 170 (170– 191); dL: III-L-1 67 (65–84), III-L-2 102 (102–116), III-L-3 119 (115–137), III-L-4 178 (178–203), III-L-5 208 (206–233), III-L-6 200 (190–212); dL: IV-L-1 149 (129–149), IV-L-2 159 (156–179), IV-L-3 202 (191–234), IV-L-4 261 (252–294), IV-L-5 286 (276–321), IV-L-6 232 (223–255). Remarks The new species Atractides (Atractides) menyuanensis sp. nov. is similar to Atractides algeriensis Lundblad, 1942 in the following points: (1) apodemes from ACG not reaching to Cx-IV; (2) P-2 ventral margin slightly convex, P-3 ventral margin nearly straight; (3) Ac in a weakly curved line in female. However, A. (A.) menyuanensis differs from A. algeriensis in following aspects: (1) two long hairs on the ventral surface of P-4 near the base, sword seta near the base in A. (A.) menyuanensis, but the ventral surface of P-4 divided by two long ventral hairs in 1:1:1, sword seta at the middle of P- 4 in A. algeriensis; (2) S-1 much more close to S- 2 in A. (A.) menyuanensis than in A. algeriensis; (3) I-L-6 of A. algeriensis much longer and more slender than that of A. (A.) menyuanensis (Gerecke 2003).

Published as part of Zhang, Yu-Hao, Li, Hai-Tao, Li, Cai-Yun & Guo, Jian-Jun, 2022, New species of genus Atractides Koch, 1837 (Acari: Hydrachnidiae, Hygrobatidae) from Qinghai, China, pp. 121-142 in European Journal of Taxonomy 833 (1) on pages 131-133, DOI: 10.5852/ejt.2022.833.1889, http://zenodo.org/record/6958174