Euochin yaoi, Wang & Li, 2021

Wang, Cheng & Li, Shuqiang, 2021, On ten species of jumping spiders from Xishuangbanna, China (Araneae, Salticidae), ZooKeys 1062, pp. 123-155 : 123

Euochin yaoi sp. nov.

Figs 2 , 3

Type material.

Holotype ♂ (IZCAS-Ar42568), China: Yunnan: Xishuangbanna, Mengla County, Menglun Town, secondary tropical seasonal moist forest (21°54.72'N, 101°16.94'E, ca. 660 m), 5-12.ix.2006, G. Zheng leg. Paratypes same locality and collector of the holotype, 1♀ (IZCAS-Ar42569), 5-12.x.2006; 1♀ (IZCAS-Ar42570), 19-25.x.2006; 1♀ (IZCAS-Ar42571), 5-12.xii.2006; 1♀ (IZCAS-Ar42572), 19-25.xii.2006; 1♀ (IZCAS-Ar42573), 19-25.i.2007; 1♀ (IZCAS-Ar42574), 19-25.ii.2007; 1♀ (IZCAS-Ar42575), 1-15.iii.2007; 1♀ (IZCAS-Ar42576), 1-15.v.2007; 1♀ (IZCAS-Ar42577), 10-20.06.2007; 1♂ (IZCAS-Ar42578), Bamboo plantation off G213 roadside (21°53.65'N, 101°16.98'E, ca. 590 m), 26.xi.2009, G. Tang, Z. Yao leg.; 1♀ (IZCAS-Ar42579), secondary tropical montane evergreen broad-leaved forest (21°54.77'N, 101°11.43'E, ca. 880 m), 1-15.i.2007, G. Zheng leg.; 1♂ (IZCAS-Ar42580), primary tropical seasonal rainforest (21°57.67'N, 101°11.89'E, ca. 640 m), 4-11.v.2007, G. Zheng leg; 1♀ (IZCAS-Ar42581), primary tropical seasonal rainforest (21°57.67'N, 101°11.89'E, ca. 640 m), 1-15.vii.2007, G. Zheng leg.

Etymology.

The specific name is a patronym in honor of Prof. Zhiyuan Yao (Shenyang, China), one of the collectors of the new species; noun (name) in genitive case.

Diagnosis.

The male of Euochin yaoi sp. nov. resembles that of E. subwanyan (Wang & Li, 2020) in having a flat embolus and oval bulb, but it can be easily distinguished from the latter by the retrolateral tibial apophysis, which is about 1.5 × longer than wide and acutely narrowed to a pointed tip distally in retrolateral view, and by the shorter embolus (Fig. 2B, C ). In contrast, the RTA is almost 3 × longer than wide and tapered to a blunted tip in retrolateral view, and the embolus is longer in E. subwanyan ( Wang and Li 2020a: fig. 5B, C). The female is similar to Euophrys longyangensis Lei & Peng, 2012 by the posteriorly located copulatory openings and sub-spherical spermathecae, but it can be easily distinguished from the latter by having a distinct atrium and by the curved copulatory ducts, which are longer than the fertilization ducts (Fig. 3A, B ) vs. indistinct and with straight copulatory ducts that are markedly shorter than the fertilization ducts in E. longyangensis (Lei and Peng 2012: fig. 5d, e).

Description.

Male (Figs 2 , 3C, D, F, G ). Total length 3.24. Carapace 1.68 long, 1.24 wide. Abdomen 1.39 long, 1.08 wide. Clypeus 0.06 high. Eye sizes and inter-distances: AME 0.39, ALE 0.26, PLE 0.25, AERW 1.13, PERW 1.08, EFL 0.77. Legs: I 3.22 (1.01, 1.23, 0.60, 0.38), II 2.85 (0.91, 1.05, 0.51, 0.38), III 3.26 (1.10, 1.10, 0.68, 0.38), IV 3.59 (1.13, 1.18, 0.88, 0.40). Carapace red-brown to dark brown, with a narrow, longitudinal, yellow-red stripe extending across nearly entire thorax centrally, covered with white and brown setae. Fovea red-brown, bar-shaped, longitudinal. Chelicerae yellow to red-brown, with 1 retromarginal tooth and 2 promarginal teeth. Endites yellow to dark yellow, distal end pale entally, with brown setae. Labium darker than endites, linguiform. Sternum almost shield-shaped. Legs yellow to red-brown, legs III, IV with annuli. Abdomen oval, dorsum dotted laterally, with pair of fitful longitudinal yellow stripes anteromedially, irregular transverse bands posteriorly; venter colored as dorsum.

Palp (Fig. 2A-D ): femur about 2 times longer than wide; tibia wider than long, with a ventral protuberance and a flat retrolateral apophysis acutely narrowed to a pointed tip distally in retrolateral view; cymbium about 1.7 times longer than wide, and gradually narrowed at distal 1/3 in ventral view; bulb inflated, almost oval; embolus flat, originating from the anterior portion of bulb, coiled nearly 360°, with a pointed tip directed anteriorly in ventral view.

Female (Fig. 3A, B, E ). Total length 3.67. Carapace 1.55 long, 1.16 wide. Abdomen 2.13 long, 1.50 wide. Clypeus 0.07 high. Eye sizes and inter-distances: AME 0.40, ALE 0.26, PLE 0.23, AERW 1.24, PERW 1.13, EFL 0.82. Legs: I 2.91 (0.93, 1.15, 0.48, 0.35), II 2.76 (0.90, 1.03, 0.48, 0.35), III 3.32 (1.08, 1.13, 0.73, 0.38), IV 3.60 (1.13, 1.20, 0.87, 0.40). Habitus similar to that of male except dorsum of abdomen lacks yellow stripes.

Epigyne (Fig. 3A, B ): wider than long; atrium oval, with a pair of arc-shaped lateral ridges, separated by a narrow median septum; copulatory openings at posterior portion of atrium; copulatory ducts extending anteriorly, connecting to postero-ental portion of spermathecae; spermathecae almost spherical, separated by less than 1/6 their diameter; fertilization ducts originating from the antero-ental portion of spermathecae, lamellar.

Distribution.

Known only from the type locality in Yunnan, China.

Comments.

The species is placed in this genus based on the flat embolus, the dense, long, white setae on the proximal half of the cymbium and distally on the male palpal tibia (mostly missing in the holotype), and the copulatory ducts are markedly shorter than the spermathecal diameter; these characters are unique to Euochin species ( Prószyński et al. 2018; Logunov 2020). However, the spherical spermathecae, posterior origin of the copulatory ducts, and the single retromarginal cheliceral tooth differ from those of the type species of Euochin (oval spermathecae, copulatory ducts originate anteromedially, and with retromarginal cheliceral fissident), indicating that further data are required to confirm the placement of this species. The male and female are considered to be conspecific because they were collected from the same localities and share similar habitus markings.

Figures

Figure 2. Male palp of Euochin yaoi sp. nov., holotype A prolateral B retrolateral C ventral D dorsal. Scale bars: 0.1.

Figure 3. Female paratype and male holotype of Euochin yaoi sp. nov. A epigyne, ventral B vulva, dorsal C holotype habitus, dorsal D ventral E female paratype habitus, dorsal F holotype carapace, frontal G holotype left chelicera, posterior. Scale bars: 0.1 (A, B, G); 0.5 (C-F).