Atractides (Atractides) longiprojectus 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 : 133-134

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 D 2, setae of D 2 extending beyond D 3. 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; O 2 and D 1 at the same level; setae of D 1 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; V 1 separated from V 2; V 3 and V 4 forming a rectangle, V 4 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) .

Figures

Fig. 9. Atractides (Atractides) longiprojectus Zhang, Li & Guo sp. nov., holotype, ♀ (GUGC, Slide No. QH-HY-2020072907). A. Idiosoma, dorsal view. B. Idiosoma, ventral view. C. Gnathosoma. D. Chelicera. E. Palp. Scale bars = 100 μm.

Fig. 10. Atractides (Atractides) longiprojectus Zhang, Li & Guo sp. nov., holotype, ♀ (GUGC, Slide No. QH-HY-2020072907). A–D. I-L–IV-L. Scale bar = 100 μm.