Tapinocyba triangularis Irfan, Yun, Lu-Yu & Zhi-Sheng, 2024, sp. nov.
Creators: name: Irfan, Muhammad
name: Yun, Dai
name: Lu-Yu, Wang
name: Zhi-Sheng, Zhang
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Linyphiidae
Tapinocyba
Tapinocyba triangularis

description: Tapinocyba triangularis sp. nov.
Figs 6, 7, 8, 12
Type material.
Holotype: China • ♂; Chongqing Municipality, Jiangjin District, Tanghe Town, Gunziping Jianshanzi, Dayuandong, 28°55′46.81″N, 106°5′13.45″E, 752 m a. s. l., 2023. III. 25, Wang L. Y. et al. leg.; SWUC -T-LIN-28-01. Paratypes: 6 ♂ 6 ♀; same location data as holotype; SWUC -T-LIN-28-02 to SWUC -T-LIN-28-13 • 5 ♂ 4 ♀; Tanghe Town, Gunziping, Jianshanzi, Dayuandong, 28°55′46.81″N, 106°5′13.45″E, 752 m a. s. l., 2023.4. 15 and 2023. IV. 30., Wang L. Y. et al. leg.; SWUC -T-LIN-28-14 to SWUC -T-LIN-28-22 • 1 ♂; Simian Mountain, Tudi Yan Guard Management Station, 28°37′24.45″N, 106°24′6.69″E, 1126 m a. s. l., 2023. IV. 27, Zhang Z. G et al. leg.; SWUC -T-LIN-28-23.
Etymology.
The specific epithet is derived from the Latin adjective triangularis, meaning “ triangular ” and referring to the somewhat triangular ventral part of the dorsal tibial apophysis of the male palp in retrolateral view.
Diagnosis.
The male of Tapinocyba triangularis sp. nov. resembles T. emei Tanasevitch, 2018 in having the similar cephalic lobe, tibial apophyses, distal suprategular apophysis (Figs 6 A – D, 7 A – C; Tanasevitch 2018: figs 1–5) and resembles T. algirica Bosmans, 2007 in having the similar anterior radical process and embolus in male palp (Bosmans 2007: figs 153–156), but it can be distinguished by the horn-shaped embolus in T. triangularis sp. nov. (Fig. 8 A; vs claw-shaped in T. emei), anterior radical apophysis present in T. triangularis sp. nov. (Figs 6 B, 7 B; vs absent in T. emei), and tibial apophyses present in T. triangularis sp. nov. (Fig. 8 A; vs absent in T. algirica). The female of T. triangularis sp. nov. resembles T. virga sp. nov. in having the similar ventral and dorsal plate (Figs 7 D – H, 10 D – H) and can be distinguished by the spermathecae globular in T. triangularis sp. nov. (Fig. 7 G, H; vs oval); copulatory opening as long as wide in T. triangularis sp. nov. (Fig. 7 D vs longer than wide).
Description.
Male (holotype, Fig. 8 A – C): total length 1.98; carapace 0.94 long, 0.75 wide, brown, cephalic lobe 0.35 long, 0.15 wide, strongly elevated, cephalic pits present at the base of cephalic lobe, fovea, cervical and radial grooves distinct. Clypeus 0.29 high. Chelicerae with five promarginal and five retromarginal teeth. Sternum yellowish brown as long as wide, shield-like, with microsetae. Eyes: AER recurved, PER procurved, slightly wider than AER, PMEs present on cephalic lobe. Eye sizes and interdistances: AME 0.05, ALE 0.07, PME 0.05, PLE 0.06, AME – AME 0.01, PME – PME 0.11, AME – ALE, 0.07, PME – PLE 0.15, AME – PME 0.13, ALE – ALE 0.37, PLE – PLE 0.39, ALE – PLE 0.01. Length of legs: I 2.49 (0.72, 0.25, 0.61, 0.50, 0.41), II 2.23 (0.66, 0.22, 0.54, 0.45, 0.36), III 1.9 (0.56, 0.22, 0.41, 0.40, 0.31), IV 2.51 (0.72, 0.23, 0.62, 0.55, 0.39). TmI 0.43 and TmIV absent. Tibial spine formula: 1-1 - 1 - 1. Opisthosoma 0.98 long, 0.72 wide, oval, greenish.
Palp (holotype, Fig. 6 A – D, a paratype SWUC -T-LIN-28-02, Fig. 7 A – C). Femur unmodified, almost as long as both patella and tibia. Patella longer than tibia. Tibia widest at distal end, with one retrolateral and one dorsal trichobothria, with two apophyses; dorsal tibial apophysis broad, tip curved ventrally pointing towards paracymbium in retrolateral view; retrolateral tibial apophysis small, somewhat triangular; paracymbium J-shaped, basally with setae, distal arm tip with blunt end; tegulum almost round, ventrally bulging above the subtegulum, protegulum distinct, membranous; suprategulum small, with distinct median suprategular apophysis, distal suprategular apophysis membranous; embolic division simple, consisting of a radix longer than wide; tailpiece tapering with blunt tip; anterior radical process half the length of embolus, sharp with pointed end; median membrane short, present in between embolus and distal suprategular apophysis; embolus slightly curved, with pointed tip.
Female (paratype SWUC -T-LIN-28-03, Fig. 8 D, E): total length 1.76; carapace 0.84 long, 0.60 wide, cephalic region slightly elevated, brown, fovea, cervical and radial grooves distinct. Clypeus 0.10 high. Chelicerae with six promarginal and five retromarginal teeth. Sternum shield-shaped, longer than wide, yellowish brown, with microsetae. Eyes: AER recurved, PER slightly procurved, slightly wider than AER. Eye sizes and interdistances: AME 0.03, ALE 0.06, PME 0.06, PLE 0.06, AME – AME 0.02, PME – PME 0.04, AME – ALE, 0.03, PME – PLE 0.04, AME – PME 0.04, ALE – ALE 0.26, PLE – PLE 0.29, ALE – PLE contiguous. Length of legs: I 2.1 (0.57, 0.22, 0.51, 0.43, 0.37), II 1.94 (0.56, 0.18, 0.47, 0.39, 0.34), III 1.68 (0.51, 0.21, 0.32, 0.36, 0.28), IV 2.21 (0.64, 0.20, 0.57, 0.44, 0.36). TmI 0.46 and TmIV absent. Tibial spine formula: 1-1 - 1 - 1. Opisthosoma 1.10 long, 0.75 wide, oval, greenish, dorsally with a pair of sigillae.
Epigyne (Fig. 7 D – H). Epigynal plate twice as wide as long; ventral plate tapering ventrally, posteriorly with round hole followed by sclerotized ventral pit on it frontal face; dorsal plate almost rectangular, longer than wide; copulatory opening located posteriorly at the base of dorsal plate; copulatory ducts large, curving into two loops; spermathecae located dorsolaterally, spaced by three diameters; fertilization ducts large and sinuous.
Distribution.
Known only from the type locality (Fig. 12).
description: Published as part of Irfan, Muhammad, Yun, Dai, Lu-Yu, Wang & Zhi-Sheng, Zhang, 2024, Four new species of Tapinocyba Simon, 1884 (Araneae, Linyphiidae) from Jiangjin District of Chongqing, China, pp. 195-214 in ZooKeys 1219 on pages 195-214, DOI: 10.3897/zookeys.1219.133899