Partnunia (Peculiaripalpus) longlingensis, ZhongK & K & K, 2024

ZhongK, Hao, K, Harry Smit & K, Jian-Jun Guo, 2024, A new subgenus representing a newly recorded genus from China, with a new species featured with special palps (Acari, Hydryphantoidea, Hydryphantidae, Partnunia), Acarologia 64 (2), pp. 654-660 : 656-659

Partnunia (Peculiaripalpus) longlingensis sp. nov.

Zoobank: FD6B07C7-90B4-46B5-8826-5B8DCADAE3B0 Figures 2–5

Habitat — A stream let in mountain forest with trees and grasses.

Material examined — Holotype: adult male, Longling County, Baoshan City , Yunnan Province, P. R. China (24.8462° N, 98.7607° E; 2027.8 m a.s.l.), collected by Pin Li and Lan

Jia ( Figure 1 ), 30-VII-2023. Allotype: adult female, same data as holotype. Paratype: one adult female, same data as holotype.

Etymology — The species is named after the name of its collection site, Longling County.

Description — Male (Holotype). Body soft, red in color ( Figure 2A–B ). Length of idiosoma 1856.2, width 1228.8. Median eye absent, O1 fused with the capsules of the lateral eyes, O2 on a small platelet. Coxae in four groups, covered with reticulate ornamentation, on which with plenty of setae, some hair-like, some heavy setae, and some spatulate in shape ( Figures 2C , 4B ). Cx-1+2 apically blunt and ending posteriorly with a sharply vertical pointed subcutaneous apodeme, the lateral end of Cx-2 with an apodeme ( Figure 4A ). Cx-1+2 L/W 601.7/479.9. Every plate around the coxal cavities of legs with an incision except Cx-4 ( Figure 4B ). Cx-3+4 anterolaterally with a thick apodeme. Cx-3+4 L/W 406.5/301.1. Ib-Ap 1075.3. Ib-Gf 588.9. Genital field (except stalks acetabula) 256.3 in length, 268.9 in width. Genital field with a large number of acetabula on stalks, about more than 30 pairs; genital sclerites field (female). Scale bars: 100 μm.

“C″-shaped, bearing fewer setae ( Figure 4C ). Sclerotized ring surrounding excretory pore. Gnathosoma protrusible ( Figure 5A ); Infracapitulum 409.1 in length; Chelicera length 435.1 ( Figure 2E ), palp not chelate, relatively stout and short, P-II with one long seta on the ventral; P-III with three long hair-like setae on the dorsal; P-IV with three small hair-like setae on the dorsal and five on anterior ventral; more than five setae on P-V ( Figures 2D , 5B ). Lengths of the segments of palp: P-I, 17.9; P-II, 213.3; P-III, 75.6; P-IV, 105.7; P-V, 58.57. Legs without swimming hairs, claws simple, the terminal segments expanded distally ( Figures 2F–I , 5D ). Dorsal lengths of segments of leg I-IV: I-L-1, 67.8; I-L-2, 169.2; I-L-3, 150.2; I-L-4, 269.9; I-L-5, 315.9; I-L-6, 242.4; II-L-1, 61.7; II-L-2, 143.8; II-L-3, 157.5; II-L-4, 252.1; II-L-5,

299.7; II-L-6, 256.9; III-L-1, 58.3; III-L-2, 130.6; III-L-3, 139.5; III-L-4, 253.6; III-L-5, 287.5;

III-L-6, 271.3; IV-L-1, 120.3; IV-L-2, 146.9; IV-L-3, 235.5; IV-L-4, 399.8; IV-L-5, 372.1;

IV-L-6, 267.6.

Female (n=2). Similar with the males. Length of idiosoma 2279.6 (2293.9), width 1595.1 (1586.2). Cx-1+2 L/W 697.7/688.6 (707.3/611.7) ( Figure 4B ). Cx-3+4 L/W 575.1/355.5 (528.1/377.9) ( Figure 5C ). Ib-Ap 1181.1 (1097.8). Ib-Gf 646.5 (451.3). Genital field (except acetabula on stalks) 371.5 (313.6) in length, 413.3 (365.1) in width. With many thick and long setae at the posterior end of genital sclerites ( Figure 4D ). Infracapitulum 537.5 (463.2) in length, chelicera length 481.2 (446.2). P-II with one long seta on the dorsal; P-III with one long hair-like seta on the dorsal; P-IV with three fine setae on the dorsal and four on the anterior ventral; More than five setae around the P-V ( Figure 3A–D ). Lengths of segments of palp: P-I, 23.2 (22.3); P-II, 311.3 (299.7); P-III, 123.8 (119.9); P-IV, 161.2 (138.7); P-V, 75.7 (78.1).

Dorsal lengths of segments of leg I-IV: I-L-1, 98.1 (120.3); I-L-2, 185.63 (198.5); I-L-3, 195.66 (185.3); I-L-4, 318.3 (312.9); I-L-5, 358.5 (362.5); I-L-6, 323.6 (337.9); II-L-1, 97.6 (100.1);

II-L-2, 192.5 (185.7); II-L-3, 177.8 (187.5); II-L-4, 310.9 (285.1); II-L-5, 359.5 (337.3); II-L-6,

319.2 (273.3); III-L-1, 106.4 (83.5); III-L-2, 212.2 (168.3); III-L-3, 230.6 (167.8); III-L-4,

352.9 (298.1); III-L-5, 382.2 (319.4); III-L-6, 303.5 (252.7); IV-L-1, 177.8 (162.7); IV-L-2,

213.3 (212.2); IV-L-3, 289.4 (273.2); IV-L-4, 535.9 (451.8); IV-L-5, 479.1 (428.9); IV-L-6,

330.1 (333.1).

Remarks — The new species can be easily distinguished by following characteristics: (1) non-chelated palps are much stout and small; (2) with a vertical pointed subcutaneous apodeme at the ending posteriorly of Cx-1+2; (3) the lateral end of Cx-2 with an apodeme.

Figures

Figure 1 Photo of thePartnunia(Peculiaripalpus) longlingensis sp. nov. site.

Figure 2 Partnunia(Peculiaripalpus) longlingensis sp. nov., male, A – idiosoma, dorsal view; B – idiosoma, ventral view; C – spatulate setae; D – palp; E – chelicera; F – leg I; G – leg II; H – leg III; I – leg IV. Scale bars: 100 μm.

Figure 3 Partnunia(Peculiaripalpus) longlingensis sp. nov., female. A – gnathosoma; B – forepart of gnathosoma; C – palp; D – P-V.

Figure 4 Partnunia (Peculiaripalpus) longlingensis sp. nov., A – Cx-1+2 (male); B – Cx-1+2 (female); C – genital field (male); D – genital

Figure 5 Partnunia(Peculiaripalpus) longlingensis sp. nov., A – gnathosoma (male); B – palp (male); C – Cx-3+4 (female); D – leg I (male). Scale bars: 100 μm.