Utivarachna linyejiei Chu & Li, 2023

Chu, Chang, Li, Shuqiang, Pham, Dinh-Sac & Yao, Zhiyuan, 2023, Three new species of the spider genus Utivarachna Kishida, 1940 (Araneae, Trachelidae) from China and Vietnam, ZooKeys 1181, pp. 201-217 : 201

publication ID	https://dx.doi.org/10.3897/zookeys.1181.110628
publication LSID	lsid:zoobank.org:pub:AB0B755A-C530-46CD-87F2-77599B974343
persistent identifier	https://treatment.plazi.org/id/3D93883A-AFDF-445F-AF51-670383CE9135
taxon LSID	lsid:zoobank.org:act:3D93883A-AFDF-445F-AF51-670383CE9135
treatment provided by	ZooKeys by Pensoft
scientific name	Utivarachna linyejiei Chu & Li
status	sp. nov.

Treatment

Utivarachna linyejiei Chu & Li View in CoL sp. nov.

Figs 1 View Figure 1 , 2 View Figure 2 , 3 View Figure 3

Type materials.

Holotype ♂ (IZCAS-Ar44626): Vietnam: Vinh Phuc Province: Tam Dao National Park, disturbed forest (21.5209°N, 105.5583°E, 693 m a.s.l.), hand caught in leaf litter, 12.XII.2007, leg. Dinh-Sac Pham. Paratypes: 1♂ (IZCAS-Ar44627), 1♂ (VNMN) and 1♀ (IZCAS-Ar44629), same data as holotype.

Etymology.

The specific name is dedicated to Mr Yejie Lin, who has helped us greatly with this research; noun (name) in genitive case.

Diagnosis.

The new species resembles U. fabaria Zhao & Peng, 2014 (cf. Figs 1 View Figure 1 - 3 View Figure 3 and Jin et al. 2015: 573, figs 4-6), as males have a similar long RTA (Fig. 1B, C View Figure 1 ), and females have a nearly trapezoidal atrium (A) (Fig. 2A View Figure 2 ), bean-shaped bursae (B) (Fig. 2B View Figure 2 ), and laminar fertilization ducts (FD) (Fig. 2B View Figure 2 ). Males can be distinguished by the terminal portion of embolus slightly twist, almost reaching cymbium distally (Fig. 1B View Figure 1 ; vs terminal portion of embolus straight, subdistally reaching cymbium in U. fabaria ), by the short subtegulum (ST), which does not reach the embolus (E) in ventral view (Fig. 1B View Figure 1 ; vs subtegulum long, almost reaching embolus in ventral view in U. fabaria ), and by the sperm duct (SD) extending to the base of tegulum (Fig. 1B View Figure 1 ; vs sperm duct separated from the base of tegulum by nearly three times the width of the sperm duct in U. fabaria ). Females can by distinguished by the copulatory openings (CO) transverse, separated by about three times their diameter (Fig. 2A View Figure 2 ; vs copulatory openings oblique, separated by less than their diameter in U. fabaria ), by the copulatory ducts (CD) strongly convoluted, basal and middle part with two twists, distal part coiled around connecting duct (CnD) (Fig. 2B View Figure 2 ; vs copulatory ducts not twisted in U. fabaria ), by the connecting ducts located on the area between copulatory openings (Fig. 2A, B View Figure 2 ; vs connecting ducts located on the lateral areas of copulatory openings in U. fabaria ), by the posterior part of bursae wider than middle part of it (Fig. 2B View Figure 2 ; vs posterior part of bursae as wide as middle part of it in U. fabaria ), and by the spermathecae (SP) separated by about half of their diameter (Fig. 2B View Figure 2 ; vs spermathecae separated by less than half of their diameter in U. fabaria ).

Description.

Male. Habitus (Fig. 3A, B View Figure 3 ). Total length 4.59. Carapace (Fig. 3A View Figure 3 ): length 2.32, width 1.82, reddish brown; cervical groove, radial grooves indistinct; fovea distinct, dark, and short. Eyes (Fig. 3A View Figure 3 ): AER procurved, PER recurved in dorsal view, PER wider than AER. Eye sizes and interdistances: AME 0.12, ALE 0.15, PME 0.13, PLE 0.15; AME-AME 0.07, AME-ALE 0.11, PME-PME 0.17, PME-PLE 0.24; MOA 0.35 long, anterior width 0.30, posterior width 0.44. Mouthparts (Fig. 3B View Figure 3 ): chelicerae reddish brown, with three promarginal (middle largest) and four retromarginal (proximal largest, distal smallest) teeth; endites depressed posteriorly, slightly convergent anteriorly, with dense setae on inner margin; labium nearly trapezoidal, length 0.49, width 0.38. Sternum (Fig. 3B View Figure 3 ) length 1.30, width 1.14, light reddish brown, with reddish-brown edges, with precoxal triangles and intercoxal extensions, posterior region protruding strongly between coxae IV. Pedicel cylindrical, sclerotized, relatively short, reddish brown. Abdomen (Fig. 3A, B View Figure 3 ) faintly yellow, 2.27 long, 1.56 wide, dorsum with scutum covering more than half of dorsal surface, with four indistinct reddish-brown spots centrally; venter with brown stripes, two lines of spots in the median field. Spinnerets surrounded by brown rings. Legs: anterior legs reddish brown, distinctly thicker than yellowish-brown posterior legs. Leg measurements: I 6.33 (1.89, 0.88, 1.55, 1.27, 0.74); II 5.81 (1.75, 0.74, 1.40, 1.26, 0.66); III 4.24 (1.22, 0.59, 0.83, 1.11, 0.49); IV 5.49 (1.56, 0.62, 1.19, 1.53, 0.59).

Palp (Fig. 1A-C View Figure 1 ): tibia shorter than half of cymbium length; RTA about 1.08 times longer than tibia, with wide base and narrow, blunt tip, with slight curvature distally. Bulb nearly oval, posterior part wider than anterior part; tegulum approximately 1.46 times as long as its maximum width in ventral view; subtegulum (ST) sclerotized, occupying approximately 1/5 of tegulum width in ventral view; sperm duct (SD) distinct, U-shaped in ventral view, extending to base of tegulum. Embolus (E) long, anticlockwise, obliquely coiled twice, coils as wide as minimum width of tegulum; basal portion of embolus lamellar, wide, arising at 12:30 o’clock from bulb; terminal portion of embolus filiform, slightly twist, suspended in above distal cymbial alveolus.

Female. Habitus (Fig. 3C, D View Figure 3 ). As in male except as noted. Total length 5.85. Carapace length 2.84, width 2.16, dark reddish brown. Eye (Fig. 3C View Figure 3 ) sizes and interdistances: AME 0.14, ALE 0.15, PME 0.13, PLE 0.15; AME-AME 0.09, AME-ALE 0.13, PME-PME 0.20, PME-PLE 0.33; MOA 0.41 long, anterior width 0.35, posterior width 0.46. Mouthparts (Fig. 3D View Figure 3 ): chelicerae with three promarginal (middle largest) and four retromarginal (proximal largest, distal smallest) teeth. Sternum (Fig. 3D View Figure 3 ) length 1.55, width 1.34, reddish brown with dark reddish-brown edges. Abdomen (Fig. 3C, D View Figure 3 ): length 3.01, width 2.34, dorsum with four distinct, reddish-brown spots centrally. Leg measurements: I 7.36 (2.16, 0.94, 1.81, 1.58, 0.87); II 7.10 (2.12, 0.91, 1.65, 1.57, 0.85); III 5.36 (1.53, 0.76, 1.10, 1.34, 0.63); IV 7.02 (2.00, 0.76, 1.60, 1.99, 0.67).

Epigyne (Fig. 2A, B View Figure 2 ): epigynal plate longer than wide, spermathecae (SP) distinct, and bursae (B) indistinct in ventral view. Atrium (A) large and nearly trapezoidal, occupying more than half of length of epigyne, posterior margin wider than anterior margin. Copulatory openings (CO) small, semicircular, located at submedially, separated by about three times their diameter. Copulatory ducts (CD) long, strongly convoluted, basal and middle part with two twists, distal part coiled around connecting duct (CnD). Connecting ducts thin and slender, located on the area between copulatory openings, separated by less than spermathecae diameter. Bursae nearly bean-shaped, anterior part strongly constricted and curved, posterior part five times width of anterior part; bursae with several small clusters of glandular particles (GP) on posterior surface, occupying about 1/8 of bursa diameter. Spermathecae elliptical, small, separated by less than their diameter. Fertilization ducts (FD) laminar, separated from each other by posterior width of atrium.

Distribution.

Vietnam (Vinh Phuc, type locality; Fig. 10 View Figure 10 ).