Atractides (Atractides) smiti 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 : 127-129

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; V 1 fused to V 2, 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; O 2 and L 1 at the same level; setae of D 1 about two thirds of the distance from D 1 to D 2; 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; V 1 fused to V 2, V 3 and V 4 forming a trapezoid, V 4 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) V 1 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) .

Figures

Fig. 4. Atractides (Atractides) smiti Zhang, Li & Guo sp. nov., holotype, ♂ (GUGC, Slide No. QH- HY-2020071706). A. Idiosoma, dorsal view. B. Idiosoma, ventral view. C. Gnathosoma. D. Chelicera. E. Palp. F. Ejaculatory complex. Scale bars = 100 μm.

Fig. 5. Atractides (Atractides) smiti Zhang, Li & Guo sp. nov., holotype, ♂ (GUGC, Slide No. QH- HY-2020071706). A–D. I-L–IV-L. Scale bar = 100 μm.