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Li, Dong-Dong, Yi, Tian-Ci, Guo, Jian-Jun, Jin, Dao-Chao (2022): Morphological changes and ontogenetic development of Amblyseius eharai Amitai & Swirski (Acari: Phytoseiidae). Zootaxa 5187 (1): 270-290, DOI: https://doi.org/10.11646/zootaxa.5187.1.15

Atractides (Atractides) smiti Zhang, Li & Guo sp. nov. urn:lsid:zoobank.org:act: D2DA763A-88E0-4432-810F-76BC5FBF1F3B Figs 4–5 Diagnosis Muscle attachments between D 3 sclerotized. I-L-5 longish, S-1 and S-2 both with blunt tips and with a narrow setal interspace between them; I-L-6 curved. Ac in an obtuse triangle; V1 fused to V2, excretory pore surrounded by sclerotized ring. P-2 and P-3 ventral margin slightly straight; P-4 divided by two ventral hairs in sectors 3:3:2, sword seta at the middle of P-4. Etymology The species is named after Dr Harry Smit in appreciation of his contributions to the taxonomy of water mites. Type material Holotype CHINA • ♂; Qinghai Province, Huangnan Tibetan Autonomous Prefecture, Zeku County, Maixiu Town; 35°18′64′′ N, 101°52′32′′ E; 3201 m a.s.l.; 17 Jul. 2020; Hai-Tao Li leg.; running water; GUGC, Slide No. QH-HY-2020071706. Description Male Idiosoma oval; O2 and L1 at the same level; setae of D1 about two thirds of the distance from D1 to D2; setae of D 2 reaching to the level of D 3 ; muscle attachments between D 3 sclerotized; all setae surrounded by sclerites; So 1 in front of A 2 , So 2 at the same level as D 1 , So 3 near D 2 , So 4 at the same level as D 3 , So 5 behind D 4 (Fig. 4A). ACG fused together and with a suture, apodemes of ACG reaching to Cx-III; genital field with a development sclerotization, the anterior part of Ap with a projection, Ac in an obtuse triangle, Ac2 near Ac3 rather than Ac1, Ac3 the biggest; V1 fused to V2, V3 and V4 forming a trapezoid, V4 at the same level as the anterior of acetabular plate; excretory pore surrounded by sclerotized ring (Fig. 4B). Palp five-segmented; P-2 and P-3 ventral margins slightly straight; P-4 with numerous dorsal hairs, and divided by two ventral hairs in sectors 3:3:2, sword seta at the middle of P-4 (Fig. 4E). I-L-5 longish, S-1 and S-2 both with blunt tips and with a narrow setal interspace between them; I-L-6 curved (Fig. 5A). Measurements Male (n = 1) Idiosoma L 513, W 369; coxal field L 264, Cx-III W 164, ACG IL 175, mL 103, W 216; infracapitular bay L 97; genital field L 131, Ac1–3 L 26, 28, 27; chelicera L 145; infracapitulum L 125; palp dL: P-1 23, P-2 49, P-3 49, P-4 70, P-5 26; legs segments: I-L-1 dL 38, I-L-2 dL 74, I-L-3 dL 67, I-L-4 dL 107, I-L-5 dL 122, HB 37, I-L-6 dL 72, HB 19, S-1 L 54, S-2 L 60; dL: II-L-1 32, II-L-2 61, II-L-3 57, II-L-4 82, II-L-5 85, II-L-6 91; dL: III-L-1 36, III-L-2 64, III-L-3 61, III-L-4 95, III-L-5 106, III-L-6 103; dL: IV-L-1 70, IV-L-2 83, IV-L-3 107, IV-L-4 138, IV-L-5 148, IV-L-6 129. Female Unknown. Remarks The new species Atractides (Atractides) smiti sp. nov. is similar to Atractides protendens K.O. Viets, 1955 in the following points: (1) P-2 and P-3 ventral margins slightly straight; (2) S-1 and S-2 with a narrow setal interspace between them; (3) the anterior part of Ap with a projection; (4) apodemes of ACG reaching to Cx-III. However, A. (A.) smiti differs from A. protendens in the following aspects: (1) V1 fused to V 2 in A. (A.) smiti, but not fused in A. protendens; (2) excretory pore surrounded by sclerotized ring in A. (A.) smiti, but smooth in A. protendens; (3) the I-L-6 of A. (A.) smiti more curved than that of A. protendens (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 127-129, DOI: 10.5852/ejt.2022.833.1889, http://zenodo.org/record/6958174, {"references":["Gerecke R. 2003. Water mites of the genus Atractides Koch, 1837 (Acari: Parasitengona: Hygrobatidae) in the western Palaearctic region: a revision. Zoological Journal of the Linnean Society 138 (2 - 3): 141 - 378. https: // doi. org / 10.1046 / j. 1096 - 3642.06 - 0.00051. x"]}

Atractides (Atractides) xianmiensis Zhang, Li & Guo sp. nov. urn:lsid:zoobank.org:act: FB29B7EB-1A14-450E-80E2-4795C3B299EA Figs 11–13 Diagnosis Male Dorsal muscle attachment unsclerotized. I-L-5 longish, S-1 and S-2 both with blunt tips and with a setal interspace between them; I-L-6 straight. Ac in an obtuse triangle; V 1 separated from V 2 . P-2 and P-3 with a ventral projection respectively, P-4 with numerous dorsal hairs, ventral hairs long, one at the middle of the surface, and the other one at the terminal of lateral edge, sword seta at the middle of P-4. Female Ac in a weakly curved line. P-2 with a ventral projection, P-3 ventral margin slightly convex, P-4 divided by two ventral hairs in sectors 1:1:1. Etymology The new species is named after the name of the Xianmi National Nature Reserve where the specimens were collected. Type material Holotype CHINA • ♂; Qinghai Province, Xianmi National Nature Reserve; 37°10′56′′ N, 102°20′03′′ E; 2949 m a.s.l.; 29 Jul. 2020; Hai-Tao Li leg.; running water; GUGC, Slide No. QH-HY-2020072910. Paratypes CHINA • 3 ♂♂; same collection data as for holotype; GUGC, Slides No. QH-HY-2020072911 to 2020072913 • 2 ♀♀; same collection data as for holotype; GUGC, Slides No. QH-HY-2020072914, 2020072915. Description Male (n = 4) Idiosoma oval, dorsal muscle attachment unsclerotized; So 1 near eye capsule; So 2 at the same level as D 1 ; So 3 at the same level as D 2 ; So 4 in front of L 4 ; So 5 behind D 4 (Fig. 11A). ACG fused together and with a suture, apodemes of ACG well developed, and reaching to Cx-III; Ac in an obtuse triangle, Ac3 biggest; V 1 separated far from V 2 , V 3 and V 4 forming a rectangle, V 4 at the same level as the anterior part of acetabular plate (Fig. 11B). Palp five-segmented; P-2 and P-3 with a ventral projection respectively, P-4 with numerous dorsal hairs, ventral hairs long, one at the middle of the surface, and the other one at the terminal of lateral edge, sword seta at the middle of P-4 (Fig. 11E). I-L-5 longish, S-1 and S-2 with blunt tips and with a setal interspace between them; I-L-6 straight (Fig. 13A). Female (n = 2) Similar to male (Fig. 12). Ac in a weakly curved line (Fig. 12B). P-2 with a ventral projection, P-3 ventral margin slightly convex, P-4 divided by two ventral hairs in sectors 1:1:1 (Fig. 11F). Measurements Male (n = 4) Idiosoma L 724 (724–896), W 605 (605–734); coxal field L 351 (351–395), Cx-III W 426 (426–483), ACG IL 251 (251–287), mL 131 (131–159), W 329 (329–372); infracapitular bay L 132 (132–160); genital field L 131 (131–144), Ac1–3 L 39 (36–41), 32 (32–43), 36 (36–46); chelicera L 227 (227–267); infracapitulum L 207 (207–239); palp dL: P-1 30 (30–37), P-2 69 (69–80), P-3 76 (76–89), P-4 107 (107–121), P-5 34 (33–34); Legs segments: I-L-1 dL 47 (47–56), I-L-2 dL 107 (107–126), I-L-3 dL 110 (110–125), I-L-4 dL 165 (165–191), I-L-5 dL 188 (188–214), HB 42 (42–46), I-L-6 dL 145 (145–160), HB 34 (32–34), S-1 L 67 (67–73), S-2 L 58 (58–65); dL: II-L-1 55 (47–59), II-L-2 94 (94–108), II-L-3 100 (100–113), II-L-4 141 (141–162), II-L-5 161 (161–184), II-L-6 154 (154–174); dL: III-L-1 54 (51– 63), III-L-2 93 (93–112), III-L-3 109 (109–124), III-L-4 166 (166–191), III-L-5 194 (194–226), III-L-6 178 (178–200); dL: IV-L-1 131 (129–137), IV-L-2 154 (154–161), IV-L-3 187 (187–211), IV-L-4 240 (240–274), IV-L-5 260 (260–303), IV-L-6 224 (224–246). Female (n = 2) Idiosoma L 925 (1215), W 754 (1042); coxal field L 403 (422), Cx-III W 515 (576), ACG IL 303 (323), mL 133 (131), W 405 (403); infracapitular bay L 180 (179); gonopore L 145 (190), Ap L 156 (156), Ac1–3 L 49 (48), 43 (45), 43 (46); chelicera L 291 (297); infracapitulum L 269 (268); palp dL: P-1 36 (46), P-2 84 (88), P-3 97 (103), P-4 124 (123), P-5 36 (39); legs segments: I-L-1 dL 59 (64), I-L-2 dL 122 (136), I-L-3 dL 131 (141), I-L-4 dL 193 (205), I-L-5 dL 220 (227), HB 47 (47), I-L-6 dL 165 (173), HB 39 (35), S-1 L 87 (78), S-2 L 74 (72); dL: II-L-1 64 (50), II-L-2 108 (106), II-L-3 121 (133), II-L-4 166 (180), II-L-5 188 (200), II-L-6 175 (186); dL: III-L-1 54 (68), III-L-2 114 (112), III-L-3 131 (142), III-L-4 198 (212), III-L-5 233 (241), III-L-6 208 (215); dL: IV-L-1 150 (160), IV-L-2 162 (174), IV-L-3 211 (228), IV-L-4 270 (293), IV-L-5 246 (314), IV-L-6 211 (265). Remarks The new species Atractides (Atractides) xianmiensis sp. nov. is similar to Atractides inflatus Walter, 1925 in the following points: (1) P-2 and P-3 of the male both with a ventral projection respectively; (2) V 1 not fused to V 2 ; (3) S-1 and S-2 both with blunt tips and with a setal interspace between them; (4) Ac in an obtuse triangle in the male and in a weakly curved line in the female. However, A. (A.) xianmiensis differs from A. inflatus in the following aspects: (1) apodemes of ACG in female well developed and reaching to Cx-III in A. (A.) xianmiensis, but not reaching to Cx-III in A. inflatus; (2) I-L-6 straight in A. (A.) xianmiensis, but curved in A. inflatus (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 137-139, DOI: 10.5852/ejt.2022.833.1889, http://zenodo.org/record/6958174, {"references":["Gerecke R. 2003. Water mites of the genus Atractides Koch, 1837 (Acari: Parasitengona: Hygrobatidae) in the western Palaearctic region: a revision. Zoological Journal of the Linnean Society 138 (2 - 3): 141 - 378. https: // doi. org / 10.1046 / j. 1096 - 3642.06 - 0.00051. x"]}

Atractides (Atractides) longiprojectus Zhang, Li & Guo sp. nov. urn:lsid:zoobank.org:act: A043146A-40FB-45E2-888A-3613E5A14165 Figs 9–10 Diagnosis Dorsal muscle attachment unsclerotized, setae of D 1 and D 2 significantly longer than others, setae of D 1 nearly reaching to D2, setae of D2 extending beyond D3. I-L-5 longish, S-1 and S-2 with a narrow setal interspace between them, S-1 longer than S-2. I-L-6 straight. Ac in a weakly curved line; V 1 separated from V 2 . P-2 with an unobvious ventral projection; P-3 ventral margin slightly convex; the ventral edge of P-4 divided by two long hairs in 2:1:2, sword seta at two thirds of P-4. Etymology The Latin prefix ‘ longi -’ means long, ACG of the female of this new species is with a particularly long hind projection. Type material Holotype CHINA • ♀; Qinghai Province, Haibei Tibetan Autonomous Prefecture, Menyuan Hui Autonomous County, Quankou Town; 37°31′31′′ N, 101°81′12′′ E; 2691 m a.s.l.; 29 Jul. 2020; Hai-Tao Li leg.; running water; GUGC, Slide No. QH-HY-2020072907. Paratypes CHINA • 2 ♀♀; same collection data as for holotype; GUGC, Slides No. QH-HY-2020072908, 2020072909. Description Female (n = 3) Idiosoma oval, dorsal muscle attachment unsclerotized; O2 and D1 at the same level; setae of D1 and D 2 significantly longer than others, setae of D 1 nearly reaching to D 2 , setae of D 2 extending beyond D 3 ; all slit organs visible, So 1 near the eye capsule, So 2 at the same level as D 1 , So 3 near D 2 , So 4 in front of L 4 , So 5 behind of D 4 (Fig. 9A). Coxal group occupying a half of ventral surface, projections from ACG extending to Cx-IV; Ac in a weakly curved line; V1 separated from V2; V3 and V4 forming a rectangle, V4 at the same level as the anterior of acetabular plate (Fig. 9B). Palp five-segmented; P-2 with an unobvious ventral projection; P-3 ventral margin slightly convex; P-4 with numerous dorsal hairs, the ventral edge of P-4 divided by two long hairs in 2:1:2, sword seta at two thirds of P-4 (Fig. 9E). I-L-5 longish, S-1 and S-2 with a narrow setal interspace, S-1 longer than S-2. I-L-6 straight (Fig. 10A). Measurements Female (n = 3) Idiosoma L 530 (530–663), W 419 (419–547); coxal field L 320 (320–361), Cx-III W 353 (353–406), ACG IL 244 (244–295), mL 126 (126–163), W 297 (296–336); infracapitular bay L 143 (133–151); gonopore L 98 (98–118), Ap L 120 (118–128), Ac1–3 L 35 (35–41), 39 (39–45), 30 (30–38); chelicera L 251 (251–275); infracapitulum L 227 (226–239); palp dL: P-1 35 (32–35), P-2 68 (68–79), P-3 75 (75–82), P-4 106 (106–110), P-5 27 (27–31); legs segments: I-L-1 dL 45 (45–53), I-L-2 dL 103 (100– 113), I-L-3 dL 103 (96–112), I-L-4 dL 153 (152–163), I-L-5 dL 166 (166–180), HB 37 (37–39), I-L-6 dL 134 (134–144), HB 34 (34–37), S-1 L 57 (57–72), S-2 L 47 (46–54); dL: II-L-1 53 (53–56), II-L-2 96 (89–104), II-L-3 96 (92–102), II-L-4 130 (130–141), II-L-5 140 (140–153), II-L-6 141 (140–152); dL: III-L-1 53 (51–59), III-L-2 87 (79–106), III-L-3 101 (101–115), III-L-4 154 (153–168), III-L-5 178 (170–189), III-L-6 163 (160–178); dL: IV-L-1 108 (108–120), IV-L-2 141 (135–141), IV-L-3 182 (178–195), IV-L-4 219 (219–239), IV-L-5 246 (234–255), IV-L-6 204 (197–218). Male Unknown. Remarks The new species Atractides (Atractides) longiprojectus sp. nov. is similar to Atractides inflatipalpis K. Viets, 1950 in the following points: (1) V 1 separated from V 2 ; (2) S-1 longer than S-2; (3) P-2 with an unobvious ventral projection. However, A. (A.) longiprojectus differs from A. inflatipalpis in the following aspects: (1) P-3 ventral margin slightly convex in A. (A.) longiprojectus, but straight in A. inflatipalpis; (2) I-L-6 straight in A. (A.) longiprojectus, but curved in A. inflatipalpis; (3) the pregenital sclerite of A. inflatipalpis in female much bigger than A. (A.) longiprojectus (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 133-134, DOI: 10.5852/ejt.2022.833.1889, http://zenodo.org/record/6958174, {"references":["Gerecke R. 2003. Water mites of the genus Atractides Koch, 1837 (Acari: Parasitengona: Hygrobatidae) in the western Palaearctic region: a revision. Zoological Journal of the Linnean Society 138 (2 - 3): 141 - 378. https: // doi. org / 10.1046 / j. 1096 - 3642.06 - 0.00051. x"]}

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, {"references":["Gerecke R. 2003. Water mites of the genus Atractides Koch, 1837 (Acari: Parasitengona: Hygrobatidae) in the western Palaearctic region: a revision. Zoological Journal of the Linnean Society 138 (2 - 3): 141 - 378. https: // doi. org / 10.1046 / j. 1096 - 3642.06 - 0.00051. x"]}

Atractides (Atractides) biprojectus Zhang, Li & Guo sp. nov. urn:lsid:zoobank.org:act: 06CA408F-1FC6-4FD0-AA2A-E94B784621C0 Figs 1–3 Diagnosis Male Dorsal muscle attachment unsclerotized. I-L-5 longish, S-1 and S-2 with blunt tips and with a narrow setal interspace between them; I-L-6 curved. Ac in an obtuse triangle, V1 separated from V2. P-2 and P-3 with a ventral projection respectively; P-4 divided by two long ventral hairs in sectors 2:3:1, sword seta between two ventral hair insertions and near the terminal. Female Similar to male. Ventral projection of P-2 not obvious, and P-3 ventral margin nearly straight. Etymology The Latin prefix ‘ bi -’ means two, in the male of the new species P-2 and P-3 are with a ventral projection respectively. Type material Holotype CHINA • ♂; Qinghai Province, Huangnan Tibetan Autonomous Prefecture, Zeku County, Maixiu Town; 35°18′64′′ N, 101°52′32′′ E; 3201 m a.s.l.; 17 Jul. 2020; Hai-Tao Li leg.; running water; GUGC, Slide No. QH-HY-2020071701. Paratypes CHINA • 3 ♂♂; same collection data as for holotype; GUGC, Slides No. QH-HY-2020071702 to 2020071704 • 1 ♀; same collection data as for holotype; GUGC, Slide No. QH-HY-2020071705. Description Male (n = 4) Idiosoma oval; dorsal muscle attachment unsclerotized, O 2 and D 1 at the same level; setae of D 1 and D 2 longer than others, setae of D 2 reaching to D 3; all slit organs visible, So 1 near the eye capsule and at the level of O 1 , So 2 in front of L 2 , So 3 near D 2 , So 4 at the middle of D 3 and L 4 ; So 5 behind D 4 (Fig. 1A). ACG fused together and with a suture, PCG separated; apodemes from ACG not reaching to Cx-IV. Acetabula three pairs and 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 middle of Ap (Fig. 1B). Palp five-segmented; P-2 and P-3 with a ventral projection respectively; P-4 with numerous dorsal hairs, and divided by two long ventral hairs in sectors 2:3:1, sword seta between two ventral hair insertions and near the terminal (Fig. 1E). I-L-5 longish, S-1 and S-2 both with blunt tips and with a narrow setal interspace between them; I-L-6 curved (Fig. 3A). Female (n = 1) Similar to male (Fig. 2). Setae of D1 and D2 shorter than that in male (Fig. 2A); ventral projection of P-2 not obvious, and P-3 ventral margin nearly straight (Fig. 1F). Measurements Male (n = 4) Idiosoma L 641 (585–645), W 546 (443–546); coxal field L 316 (314–325), Cx-III W 333 (333–347), ACG IL 237 (234–239), mL 125 (107–125), W 268 (268–284); infracapitular bay L 123 (118–127); genital field L 120 (119–120), Ac1–3 L 34 (33–38), 34 (34–42), 37(37–40); chelicera L 205 (204–207); infracapitulum L 159 (140–177); palp dL: P-1 29 (29–32), P-2 74 (68–74), P-3 62(59–66), P-4 95(95– 99), P-5 27 (27–29); legs segments: I-L-1 dL 48 (46–52), I-L-2 dL 93 (89–93), I-L-3 dL 80 (78–80), I-L-4 dL 119 (119–125), I-L-5 dL 163 (163–176), HB 53 (53–60), I-L-6 dL 119 (119–122), HB 22 (21–22), S-1 L 90 (78–90), S-2 L 74 (74–75); dL: II-L-1 47 (47–50), II-L-2 82 (74–82), II-L-3 71 (70–74), II-L-4 92 (92–102), II-L-5 116 (116–120), II-L-6 124 (124–127); dL: III-L-1 56 (53–57), III-L-2 90 (81–90), III-L-3 75 (73–77), III-L-4 124 (124–125), III-L-5 146 (146–154), III-L-6 141 (133–147); dL: IV-L-1 117 (117–120), IV-L-2 105 (102–113), IV-L-3 138 (135–138), IV-L-4 174 (174–180), IV-L-5 199 (199–208), IV-L-6 163 (162–170). Female (n = 1) Idiosoma L 902, W 721; coxal field L 390, Cx-III W 477, ACG IL 272, mL 137, W 355; infracapitular bay L 165; gonopore L 146, Ap L 140, Ac1–3 L 43, 47, 47; chelicera L 267; infracapitulum L 222; palp dL: P-1 38, P-2 84, P-3 84, P-4 123, P-5 34; legs segments: I-L-1 dL 64, I-L-2 dL 113, I-L-3 dL 114, I-L-4 dL 176, I-L-5 dL 242, HB 77, I-L-6 dL171, HB 26, S-1 L 120, S-2 L 106; dL: II-L-1 72, II-L-2 98, II-L-3 96, II-L-4 135, II-L-5 153, II-L-6 162; dL: III-L-1 69, III-L-2 100, III-L-3 107, III-L-4 168, III-L-5 193, III-L-6 181; dL: IV-L-1 153, IV-L-2 141, IV-L-3 184, IV-L-4 231, IV-L-5 267, IV-L-6 211. Remarks The new species Atractides (Atractides) biprojectus sp. nov. is similar to Atractides yazdensis Pešić, Smit & Saboori, 2021 in the following points: (1) male P-2 and P-3 with ventral projections; (2) setae S-1 and S-2 separated, with a narrow setal interspace; (3) V 1 separated from V 2 . However, A. (A.) biprojectus differs from A. yazdensis in following aspects: (1) P-4 sword seta between two ventral hair insertions in A. (A.) biprojectus, but slightly proximal to posteroventral hair in A. yazdensis; (2) apodemes from ACG not reaching to Cx-IV in A. (A.) biprojectus, but reaching to Cx-IV in A. yazdensis; (3) genital field of A. (A.) biprojectus much rounder than that of in A. yazdensis (Pešić et al. 2021)., 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 123-127, DOI: 10.5852/ejt.2022.833.1889, http://zenodo.org/record/6958174, {"references":["Pesic V., Smit H. & Saboori A. 2021. New records of the water mite genus Atractides Koch, 1837 from Iran (Acari: Hydrachnidia: Hygrobatidae). Ecologica Montenegrina 44: 1 - 10. https: // doi. org / 10.37828 / em. 2021.44.1","Pesic V. & Smit H. 2021 a. A new species of the genus Atractides Koch, 1837 from Turkey (Acari: Hydrachnidia: Hygrobatidae). Ecologica Montenegrina 43: 44 - 50. https: // doi. org / 10.37828 / em. 2021.43.6"]}