Arrenurus (Truncaturus) linguaus, Zheng & Guo & Zhang, 2022

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, Zootaxa 5174 (1), pp. 55-72 : 57-58

publication ID	https://doi.org/ 10.11646/zootaxa.5174.1.4
publication LSID	lsid:zoobank.org:pub:FDD9ED90-D5F1-4C9F-8DB6-95D2C2B3E49F
DOI	https://doi.org/10.5281/zenodo.6974203
persistent identifier	https://treatment.plazi.org/id/5E2587BD-A054-A839-FF22-FECEFAC76C33
treatment provided by	Plazi
scientific name	Arrenurus (Truncaturus) linguaus
status	sp. nov.

Treatment

Arrenurus (Truncaturus) linguaus sp. nov.

( Figs 1–2 View FIGURE 1 View FIGURE 2 )

Material examined. Holotype male, GUGC, Slide No. AH-AR-2016070701, Huangshan , Huangshan City, Anhui Province, P. R. China (118°31'73′′ N, 29°70′92′′ E; alt. 1020 m), 07-VII-2016, Xinyao Gu leg.

Diagnosis. Hyaline petiole tongue-shaped, small humps lateral to petiole; Hyaline membrane trapezoid; Ap approximately triangular.

Description. Male (n=1; Figures 1–2 View FIGURE 1 View FIGURE 2 ): Idiosoma L 584 (including petiole), W 507, L/W ratio 1.15 ( Fig. 1A View FIGURE 1 ). Anterior margin of idiosoma convex ( Fig. 1A View FIGURE 1 ). Dorsal furrow incomplete and reaching to end of the posterior margin of the pygal lobes; Dorsal shield W 361, the front part nearly convex; Dorsal humps absent ( Figs. 1A, C View FIGURE 1 ). Hyaline petiole tongue-shaped, with small humps lateral to petiole ( Fig. 1A View FIGURE 1 ); Hyaline membrane trapezoid. Dorsum with an incomplete dorsal shield including postocularia, D 1 and D 2 ( Fig. 1A View FIGURE 1 ). Cx-I and Cx-II extending slightly beyond anterior idiosoma margin; medial margin of Cx-IV twice as long as that of Cx-III ( Fig. 1B View FIGURE 1 ). ACG medium L 168; PCG medium L 192; Gb–Cx-IV 276; Gb–Gp 374; Gb–Ep 425 ( Fig. 1B View FIGURE 1 ). Suture lines of Cx-I and Cx-II, CxIII and Cx-IV very obvious. Idiosoma posteriorly with a large concavity ( Fig. 1B View FIGURE 1 ). Ap approximately wing-shaped, triangular ( Fig. 1B View FIGURE 1 ). IV-L with swimming setae; IV-L-4 without a spur ( Fig. 2D View FIGURE 2 ). L of palp segments: P-I 18, P-II 41, P-III 45, P-IV 62, P-V 27; P-2 with three ventral setae; L of I-L-1–6: 30, 55, 54, 79, 89, 104 ( Fig. 2A View FIGURE 2 ); L of II-L-1–6: 37, 70, 68, 87, 100, 121 ( Fig. 2B View FIGURE 2 ); L of III-L-1–6: 64, 70, 53, 88, 106, 91 ( Fig. 2C View FIGURE 2 ); L of IV-L-1–6: 77, 119, 92, 118, 83, 91 ( Fig. 2D View FIGURE 2 ).

Female. unknown.

Habitat. Inhabits the slow-flow stage of creeks with aquatic plants.

Etymology. Derived from the Latin word "lingua" (tongue), after the tongue-shaped petiole.

Remarks. This new species differs from all other species in this subgenus, except Arrenurus (Truncaturus) corpuscularis Jin & Wiles, 1996 . However, the new species can be distinguished from A. (T.) corpuscularia in the following points: (1) Ap approximately triangular in the new species, but long-bar shaped in A. (T.) corpuscularis ; (2) petiole relatively big (about seven times wider and three times longer) in the new species, but small in A. (T.) corpuscularis ; (3) P-II without a patch of setae on the medial surface in the new species, but with a patch of setae in A. (T.) corpuscularis ; without dorsal humps in the new species, but with dorsal humps in A. (T.) corpuscularis .