Atractides (Atractides) biprojectus 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 : 123-127

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, V 1 separated from V 2. 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) .

Figures

Fig. 1. Atractides (Atractides) biprojectus Zhang, Li & Guo sp. nov. A–E. Holotype, ♂ (GUGC, Slide No. QH-HY-2020071701).F. Paratype, ♀ (GUGC, Slide No. QH-HY-2020071705). A. Idiosoma, dorsal view. B. Idiosoma, ventral view. C. Gnathosoma. D. Chelicera. E. Palp. F. Palp. Scale bars = 100 μm.

Fig. 2. Atractides (Atractides) biprojectus Zhang, Li & Guo sp. nov. A–B. Paratype, ♀ (GUGC, Slide No. QH-HY-2020071705). A. Idiosoma, dorsal view. B. Idiosoma, ventral view. Scale bar = 100 μm.

Fig. 3. Atractides (Atractides) biprojectus Zhang, Li & Guo sp. nov., holotype, ♂ (GUGC, Slide No. QH-HY-2020071701). A–D. I-L–IV-L. Scale bar = 100 μm.