Arrenurus (Arrenurus) yanchengensis Zheng & Guo & Zhang 2022, sp. nov.
Creators: name: Zheng, Yulin
name: Guo, Jianjun
name: Zhang, Runzhi
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Arrenuridae
Arrenurus
Arrenurus yanchengensis

description: Arrenurus (Arrenurus) yanchengensis sp. nov.
(Figs 7–8)
Material examined. Holotype male, GUGC, Slide No. JS-AR-2018072701, Yancheng City, Jiangsu Province, P. R. China (33°37′76″N, 120°13′99″E; alt. 5 m), 27-VII-2018, Zhuhui Ding leg.. 1/0/0.
Diagnosis. Hyaline membrane short and extending to the base of the pygal lobes; pygal lobes well developed, posteriorly almost at the same level as posteror margin of petiole; D 4 on a small hump, flanked by two connected small humps.
Description. Male (n=1; Figures 7–8): Idiosoma L 973 (including petiole), W 718, L/W ratio 1.36 (Fig. 7A). Anterior margin of idiosoma slightly concave (Fig. 7A). Dorsal furrow incomplete, dorsal shield W 450; D 1 on small humps (Fig. 7A). Pygal lobes well developed, posteriorly, almost at the same level as posterior margin of petiole. Hyaline membrane short and extending to the base of the pygal lobes (Fig. 7A). Petiole L 99, approximately rectangular; ligulate process bottle-shaped, lying anterior to posterior margin of petiole (Fig. 7A). In lateral view, the dorsal humps small (Fig. 7C). Cx-I and Cx-II not extending beyond anterior margin of idiosoma; medial margin of Cx-IV twice the length of the medial margin of Cx-III (Fig. 7B). ACG medium L 218; PCG medium L 234; Gb–Cx-IV 412; Gb–Gp 478; Gb–Ep 619; Ap enlarged at the Gp, extending to lateral margins of idiosoma, lateral parts narrower; Ap with two pairs of genital setae (Fig. 7B). D 4 on a small hump near the petiole, flanked by two connected small humps (Fig. 7A). L of palp segments: P-I 25, P-II 60, P-III 49, P-IV 73, P-V 43 (Fig. 7D), P-2 with two ventral setae; L of leg segments: L of I-L-1–6: 55, 96, 102, 128, 129, 182 (Fig. 8A); L of II-L-1–6: 60, 108, 123, 156, 157, 204 (Fig. 8B); L of III-L-1–6: 90, 134, 121, 164, 164, 184 (Fig. 8C); L of IV-L-1–6: 116, 181, 183, 263, 101, 144 (Fig. 8D).
Female. unknown.
Habitat. streams.
Distribution. China (Jiangsu).
Etymology. Named after Yancheng City, where the type specimen was collected.
Remarks. The new species is similar to Arrenurus (Arrenurus) angelieri Cassagne-Méjean, 1966 (Gerecke et al. 2016). However, the new species differs from A. (A.) angelieri in the following points: (1) Hyaline membrane short and extending to the base of the pygal lobes in the new species, but not extending laterally in A. (A.) angelieri; (2) without ligulate process in the new species, but with a short ligulate process in A. (A.) angelieri; (3) Ap extending to lateral margins of idiosoma in the new species, but not extending laterally in A. (A.) angelieri; (4) posterior margin of petiole concave in A. (A.) angelieri, but convex in the new species.
description: Published as part of Zheng, Yulin, Guo, Jianjun & Zhang, Runzhi, 2022, Three new and two newly recorded species of the water mite genus Arrenurus Dugès, 1834 (Acari, Hydrachnidia: Arrenuridae) from China, pp. 55-72 in Zootaxa 5174 (1) on pages 62-63, DOI: 10.11646/zootaxa.5174.1.4, http://zenodo.org/record/6973058