Parathyas weichangensis Zhong 2026, sp. nov.

Parathyas weichangensis Zhong sp. nov. urn:lsid:zoobank.org:act: 497657AB-90E8-4560-98CB-F268EAA53622 Figs 1–3 Diagnosis A 1 smooth, thick and short. Coxae with very few fine setae. Pregenital sclerite extremely large, with a Y-shaped sclerite and anteriorly an arc-shaped ring. Ac-2 and Ac-3 fused into a common sclerite in trapezoidal arrangement. Setae of palp smooth. Legs slender and leg IV relatively long. Etymology The species is named after the Weichang County, where the holotype was collected. Type material Holotype P.R. CHINA • ♀; Hebei Province, Chengde City, Weichang County; 42.3915° N, 117.1617° E; 1488 m a.s.l.; 26 Jun. 2021; Hai-Tao Li leg.; puddle still water; slide no. HB-HY-2021062601; GUGC. Paratype P.R. CHINA • 1 ♀; same data as for holotype; slide no. HB-HY-2021062602; GUGC. Description Female (n = 2) Idiosoma elliptical (Fig. 1A–B), red in colour. Integument papillate. Muscle attachment sclerites present. Median eye free in integument, external diameter of frontal ring approximately ½ × as long as eye capsule. Prefrontalia and postfrontalia separated. A 1 smooth, thick and short. O 1 located near anterior idiosoma margin. Dc1 and Dc2 fused to form rounded platelet on each side, Dc3–5 of small size (Figs 1A, 3A). Coxae in four groups, setae on coxae minute and sparse. Anteromedial margin of Cx-I with three setae, anterolateral margin of Cx-I with one seta; lateral margin of Cx-II with two setae; lateral margin of Cx-III with three setae (Fig. 3B). Genital plate with transverse anterior; pregenital sclerite extremely large, with Y-shaped sclerite and anteriorly arc-shaped ring (Fig. 3J); medial margin of genital plate with very small setae, and with longer setae posteriorly. Three pairs of acetabula, arranged more or less in line on each side. Ac-1 lying anterior to anterior margin of genital plate, Ac-2 and Ac-3 fused into common sclerite in trapezoidal arrangement (Fig. 2A). Excretory pore slit-shaped, with large crescent-shaped anterior sclerite, posterior sclerite small, not forming continuous ring, and with knobshaped anterior extension. Setae of palp smooth, dorsal margin of P-I with two setae; P-II with four setae; P-III with one long seta; P-IV with small dorsodistal extension, and with one homomorphic hair-like seta on ventrodistal and dorsodistal ends, respectively; P-V sharp, with two small setae (Figs 2B, 3C). Gnathosoma with short rostrum (Figs 2C, 3E). Chelicera chela serrated (Figs 2D, 3D). Legs slender and leg IV relatively long, with many peg-like setae and without swimming setae (Fig. 3F–I). MEASUREMENTS.. Idiosoma length 1650 (1815), width 1313 (1382). ACG 376 (393) in length, 297 (320) in width. PCG 378 (426) in length, 339 (412) in width. Genital field (including pregenital sclerite) 347 (346) in length, 197 (205) in width. Ib-Ap 888 (996). Ib-Gf 211 (275). Dorsal lengths of palp segments: P-I, 56 (62); P-II, 120 (132); P-III, 100 (109); P-IV, 195 (218) (including small distal extension); P-V, 43 (46). Gnathosoma 306 (323) in length. Chelicera length 390 (401). Dorsal lengths of segments of legs I–V: I-L-1, 85 (109); I-L-2, 115 (120); I-L-3, 129 (165); I-L-4, 191 (246); I-L-5, 243 (281); I-L-6, 188 (243) (Fig. 1C); II-L-1, 95 (90); II-L-2, 108 (136); II-L-3, 143 (189); II-L-4, 249 (285); II-L-5, 330 (346); II-L-6, 288 (313) (Fig. 1D); III-L-1, 87 (97); III-L-2, 123 (122); III-L-3, 166 (167); III-L-4, 232 (287); III-L-5, 317 (367); III-L-6, 307 (308) (Fig. 1E); IV-L-1, 198 (249); IV-L-2, 147 (165); IV-L-3, 219 (250); IV-L-4, 398 (456); IV-L-5, 406 (449); IV-L-6, 321 (342) (Fig. 1F). Male Not collected. Remarks This new species resembles Parathyas barbigera (K. Viets, 1908). But there are obvious differences: (1) A 1 smooth, thick and short in the new species, but A 1 plumose, slender and long in P. barbigera (Tuzovskij 2007); (2) setae of P-I–III smooth in the new species, but plumose in P. barbigera (Tuzovskij 2007; Di Sabatino et al. 2010); (3) setae on coxae minute and sparse in the new species, but coxae with numerous setae especially Cx-I and Cx-III in P. barbigera (Tuzovskij 2007); (4) pregenital sclerite extremely large, with a Y-shaped sclerite and anteriorly an arc-shaped ring in the new species, but pregenital sclerite inverted water droplet-shaped in P. barbigera (Tuzovskij 2007); (5) dorsal and ventral plates of small size in the new species, but dorsal and ventral plates rather large, especially in females of P. barbigera (Tuzovskij 2007); (6) excretory pore slit-shaped, with a large crescent-shaped anterior sclerite, posterior sclerite small, not forming a continuous ring in the new species, but excretory pore surrounded by a sclerotized ring in P. barbigera (Tuzovskij 2007; Di Sabatino et al. 2010).