Tetragnatha tricuspidata Liu, Huang, Yin & Xu, 2026, sp. nov.

Tetragnatha tricuspidata sp. nov. Figs 1, 2, 3, 4, 7 Chinese name: 三尖肖蛸 Type material. Holotype: China • ♂; Shaanxi Province, Baoji City, Feng County, Ma Village; 33°51'39"N, 106°31'48"E; 1672 m a. s. l.; 6 Jun. 2022; Ailan He, Jinxin Liu, Zongguang Huang, Yun Liang, Yu Hui, Yingli Wen, Yang Liu leg.; HNU 1092. Paratypes. China • 1 ♀; Shaanxi Province, Baoji City, Feng County, Tongtianhe River National Forest Park; 32°41'13"N, 106°47'44"E; 2046 m a. s. l.; 5 Jun. 2022; same collectors as holotype; HNU 1111 • 1 ♀; Sichuan Province, Bazhong City, Nanjiang County, Guangwushan – Nuoshuihe UNESCO Global Geopark, Micangshan Mountain; 32°39'51"N, 106°55'54"E; 1406 m a. s. l.; 2 Jun. 2022; same collectors as holotype; HNU 1113. Diagnosis. Both male and female of the new species resemble those of T. bifurcata Li & Liu, 2022. Males have a similar conductor with two folds and a bifurcated distal end, with the fang slightly curved toward the lower view, and females of the two species are similar in the shape of genital fold and in having short and laterally bulging chelicerae (with the same number of teeth), but the two species differ in the following characters: (1) male dorsal apophysis (a) located near the dorsal surface of the chelicera, away from the promarginal tooth in new species, vs located midway between the promarginal tooth and the dorsal surface of the chelicera in T. bifurcata (cf. Fig. 2 A with fig. 1 D in Li et al. 2022); (2) distal end of conductor with three tips in new species, vs two tips in T. bifurcata (cf. Fig. 4 D with fig. 1 L in Li et al. 2022); (3) the anterior pair of spermathecae are spherical and the posterior pair of spermthecae are oblong in new species, vs both the anterior and posterior pair of spermathecae are spherical in T. bifurcata (cf. Fig. 4 F with fig. 2 H in Li et al. 2022). Description. Male (holotype). Total length 5.12. Carapace 2.01 long, 1.28 wide, yellowish brown; cervical groove dark; radial grooves indistinct; fovea inverted V-shaped (Fig. 1 A). Bases of anterior and posterior lateral eyes contiguous. Eye diameters and interdistances: AME 0.09, ALE 0.08, PME 0.10, PLE 0.09; AME – AME 0.10, AME – ALE 0.17, PME – PME 0.17, PME – PLE 0.18. MOA 0.27 long, anterior width 0.28, posterior width 0.38. Legs slender, similar in colour to carapace (Fig. 1 A – C), trichobothria present on femur. Leg measurements: I 19.19 (5.44, 0.67, 5.81, 5.91, 1.36); II 13.10 (3.89, 0.75, 3.73, 3.76, 0.97); III 5.82 (2.02, 0.49, 1.32, 1.42, 0.57); IV 11.34 (3.71, 0.49, 2.90, 3.37, 0.87). Chelicerae yellow, “ a ” situated near the dorsal surface of chelicera, with flat end; AXu short and bifurcate, AXl absent; upper row with five teeth, Gu smaller than U 2, distance between Gu and U 2 shorter than that between U 2 and U 3; lower row with five teeth, Gl equal in size to L 2 (Figs 2 A – C, 3). Sternum 1.06 long, 0.84 wide, yellow, shield-shaped (Fig. 1 B). Maxillae yellowish brown, longer than wide, with widened distal ends. Labium wider than long. Abdomen 3.10 long, 1.23 wide, elliptical, dorsally with irregular silver guanine spots interspersed with brown markings (Fig. 1 A, C). Palp (Fig. 4 A – D). Tibia twice as long as wide, distal dorsal margin extended into plate-like protuberance. Paracymbium with a triangular knob, a shallow notch, and a translucent lobe occupying almost 1 / 3 the width of paracymbium in retrolateral view. Cymbium constricted medially, distal portion curled into semi-enclosed configuration. Tegulum like a sphere missing both ends in ventral view. Conductor distal end divided into two branches, ventral branch with an additional median tip, resulting in three tips (in retrolateral view, the additional median tip appears as a short line between branches; in ventro-prolateral view, its full shape is visible) (Fig. 4 B, D). Embolus with broad basal half circling clockwise around the bulb, slender distal half extending toward bases of distal tip of conductor (Fig. 4 B). Female (paratype). Total length 6.47. Carapace 1.96 long, 1.25 wide, yellowish green; cervical groove dark; radial grooves indistinct; fovea triangular (Fig. 1 D). Eye diameters and interdistances: AME 0.09, ALE 0.07, PME 0.09, PLE 0.09; AME – AME 0.10, AME – ALE 0.19, PME – PME 0.17, PME – PLE 0.16. MOA 0.30 long, anterior width 0.29, posterior width 0.36. Leg measurements: I 18.19 (5.13, 0.72, 5.59, 5.46, 1.29); II 12.23 (3.58, 0.76, 3.20, 3.56, 1.13); III 5.41 (1.76, 0.47, 1.24, 1.29, 0.65); IV 10.49 (3.52, 0.52, 2.58, 2.99, 0.88). Chelicerae slightly green; upper row with five teeth, U 2 largest and separated from Gu widely; lower row with six teeth, L 2 largest and separated from Gu slightly (Fig. 2 D – F). Sternum 1.06 long, 0.82 wide, yellow-green, shield-shaped. Maxillae yellowish green, longer than wide, with widened distal ends. (Fig. 1 E). Abdomen 4.51 long, 1.40 wide. Other somatic characters as in male. Female genitalia (Fig. 4 E, F). Genital fold wider than long. Two pairs of spermathecae: anterior pair nearly spherical, posterior pair oblong; anterior pair situated between posterior spermathecae. Central membranous sac (CS) absent. Etymology. The specific epithet is from the Latin tricuspidatus (“ three-tipped ”), referring to the conductor bearing three distal tips; adjective. Distribution. Known only from the type locality (Fig. 7).