Tapinocyba triangularis, Irfan & Yun & Lu-Yu & Zhi-Sheng, 2024

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, ZooKeys 1219, pp. 195-214 : 195-214

publication ID	https://doi.org/ 10.3897/zookeys.1219.133899
publication LSID	lsid:zoobank.org:pub:40631DBF-34FF-4C81-A6A4-8C940FBA1E69
DOI	https://doi.org/10.5281/zenodo.14269245
persistent identifier	https://treatment.plazi.org/id/7F59FBB0-D080-581E-8F32-47990AB213A4
treatment provided by	ZooKeys by Pensoft
scientific name	Tapinocyba triangularis
status	sp. nov.

Treatment

Tapinocyba triangularis sp. nov.

Figs 6 View Figure 6 , 7 View Figure 7 , 8 View Figure 8 , 12 View Figure 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 GoogleMaps . Paratypes: 6 ♂ 6 ♀; same location data as holotype; SWUC -T-LIN-28-02 to SWUC -T-LIN-28-13 GoogleMaps • 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 GoogleMaps • 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 GoogleMaps .

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 View Figure 6 , 7 A – C View Figure 7 ; 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 View Figure 8 ; vs claw-shaped in T. emei ), anterior radical apophysis present in T. triangularis sp. nov. (Figs 6 B View Figure 6 , 7 B View Figure 7 ; vs absent in T. emei ), and tibial apophyses present in T. triangularis sp. nov. (Fig. 8 A View Figure 8 ; 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 View Figure 7 , 10 D – H View Figure 10 ) and can be distinguished by the spermathecae globular in T. triangularis sp. nov. (Fig. 7 G, H View Figure 7 ; vs oval); copulatory opening as long as wide in T. triangularis sp. nov. (Fig. 7 D View Figure 7 vs longer than wide).

Description.

Male (holotype, Fig. 8 A – C View Figure 8 ): 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 View Figure 6 paratype SWUC -T-LIN-28-02 , Fig. 7 A – C View Figure 7 ). 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 View Figure 8 ): 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 View Figure 7 ). 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 View Figure 12 ).