Atractides (Atractides) xianmiensis Zhang, Li & Guo, 2022

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, European Journal of Taxonomy 833 (1), pp. 121-142 : 137-139

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) .

Figures

Fig. 11. Atractides (Atractides) xianmiensis Zhang, Li & Guo sp. nov. A–E. Holotype, ♂ (GUGC, Slide No. QH-HY-2020072910). F. Paratype, ♀ (GUGC, Slide No. QH-HY-2020072914). A. Idiosoma, dorsal view. B. Idiosoma, ventral view. C. Gnathosoma. D. Chelicera. E. Palp. F. Palp. Scale bars = 100 μm.

Fig. 12. Atractides (Atractides) xianmiensis Zhang, Li & Guo sp. nov., paratype, ♀ (GUGC, Slide No. QH-HY-2020072914). A. Idiosoma, dorsal view. B. Idiosoma, ventral view. Scale bar = 100 μm.

Fig. 13. Atractides (Atractides) xianmiensis Zhang, Li & Guo sp. nov., holotype, ♂ (GUGC, Slide No. QH-HY-2020072910). A–D. I-L–IV-L. Scale bar = 100 μm.