Siamspinops yejiei Wang, Gan & Mi, 2023

Wang, Cheng, Gan, Jiahui & Xiaoqi, Mi, 2023, A new species of Siamspinops Dankittipakul & Corronca, 2009 from Guizhou, China (Araneae, Selenopidae), Biodiversity Data Journal 11, pp. 102450-102450 : 102450

Siamspinops yejiei Wang, Gan & Mi sp. n.

Materials

Type status: Holotype. Occurrence: sex: female; occurrenceID: 0E1ACA16-D1C7-548F-A801-BEA5051675B1; Taxon: scientificName: Siamspinops yejiei; Location : country: China; stateProvince: Guizhou; county: Shiqian ; locality: Ganxi Township , Fuyan Village ; verbatimElevation: 800-900 m; verbatimLatitude: 27°21.46′N; verbatimLongitude: 108.2.03′E; Identification: identifiedBy: Cheng Wang; Event: year: 2020; month: June; day: night of 20; habitat: stone wall Type status: Paratype. Occurrence: sex: 1 male, 1 female; occurrenceID: 0373C481-7FF2-520B-BBC9-9F083D3ED418; Taxon: scientificName: Siamspinops yejiei; Location : country: China; stateProvince: Guizhou; county: Shiqian ; locality: Ganxi Township , Fuyan Village ; verbatimElevation: 800-900 m; verbatimLatitude: 27°21.46′N; verbatimLongitude: 108.2.03′E; Identification: identifiedBy: Cheng Wang; Event: year: 2020; month: June; day: night of 20; habitat: stone wall

Description

Female (Holotype, TRU-SN-005, Fig. 2 A, C, E, F, H; paratype, TRU-SN-006, Fig. 2 B, D). Total length 7.47. Carapace 2.94 long, 3.28 wide. Abdomen 4.79 long, 3.70 wide. Eye sizes: AME 0.16, ALE 0.09, PME 0.17, PLE 0.21. Leg measurements: I 9.70 (2.80, 1.15, 2.65, 2.10, 1.00), II 11.75 (3.75, 1.30, 3.20, 2.50, 1.00), III 12.75 (4.05, 1.30, 3.95, 2.45, 1.00), IV 9.90 (3.50, 1.00, 2.45, 2.00, 0.95). Carapace pear-shaped, yellow to brown, with slightly elevated cephalic region bearing a pair of oblique brown stripes behind PMEs and oval thoracic region bearing pairs of irregular, brown patches mediolaterally. Chelicerae yellow, each with three promarginal and two retromarginal teeth. Endites slightly longer than wide. Labium almost trapeziform. Sternum almost oval, with straight anterior margin, covered with brown setae. Legs pale to yellow, mingled with green-brown patches, with three (1-1-1) dorsal spines, two (1-1-0) prolateral spines on femora Ⅰ and 15 (1-2-2-2-2-2-2-2) and 10 (2-2-2-2-2) ventral spines on tibiae and metatarsi Ⅰ and Ⅱ, respectively. Abdomen elongate-oval, dorsum grey, mingled with dark brown spots and patches, covered with short setae; venter pale to brown, with dark margin. Epigyne (Fig. 2 A-D): longer than wide, with broad, postero-marginally located pocket and sub-oval lobe in median field; copulatory openings beneath postero-lateral atrial margins; accessory bulb straight, bar-shaped, anteriorly extending; copulatory ducts long, strongly convoluted, forming six or seven coils; spermathecae elongated, obliquely extending.

Male (paratype, TRU-SN-007, Fig. 1 A-C, Fig. 2 G). Total length 6.30. Carapace 2.9 long, 3.2 wide. Abdomen 3.74 long, 2.7 wide. Eye sizes: AME 0.16, ALE 0.09, PME 0.16, PLE 0.20. Leg measurements: I 9.90 (2.85, 1.15, 2.65, 2.10, 1.15), II 11.90 (3.70, 1.25, 3.25, 2.50, 1.20), III 13.15 (4.00, 1.25, 4.25, 2.40, 1.25), IV 9.60 (2.80, 1.15, 2.50, 2.15, 1.00). Habitus similar to that of female, but paler and covered with dense setae on carapace and only with 13 ventral spines on tibiae Ⅰ and 14 on tibiae II. Palp (Fig. 1 A, B): tibia slightly longer than wide, bearing long setae retrolatero-dorsally, with straight, apically blunt vRTA about equal in length to the width of dRTA in ventral view and flat, tapered dRTA with pointed tip directed towards about 45 degrees in ventral view; cymbium setose; bulb flat, almost round; conductor almost T-shaped, tip sclerotised, pointed; median apophysis anteroprolateral to embolic base, curved inwards distally; embolus curved into a circle, with small, serrated processes at base.

Diagnosis

Siamspinops yejiei sp. n. closely resembles S. banna Lin & Li, 2022 in having a very similar epigynal pocket and male palp, but it can be distinguished by the following: 1) the accessory bulb (described as spermathecal head in Lin et al. (2022)) does not extend anteriorly beyond the copulatory ducts in dorsal view (Fig. 2 C, D), versus extends beyond the copulatory ducts in S. banna ( Lin et al. 2022: fig. 36B); 2) the epigynal pocket is about 1/3 the epigynal width (Fig. 2 A, B), versus about 1/2 the epigynal width in S. banna ( Lin et al. 2022: fig. 36A); 3) the embolus has serrated processes at the base (Fig. 1 B, see the red arrow), versus absent in S. banna ( Lin et al. 2022: fig. 35B); 4) the median apophysis is widest at the base in ventral view (Fig. 1 A), versus widest medially in S. banna ( Lin et al. 2022: fig. 35A); 5) tip of the conductor is prolateral to the retrolateral margin of bulb in ventral view (Fig. 1A), whereas it is retrolateral to the retrolateral margin of bulb ( Lin et al. 2022: fig. 35A); 6) the male chelicera has two retromarginal teeth (Fig. 1 C), versus just one in S. banna (see the description in Lin et al. (2022)).

Etymology

The species is named after Mr. Yejie Lin, who guided us through the method of taking photographs and helped with species identification; noun (name) in genitive case.

Distribution

China (Guizhou) (Fig. 3 ).

Figures

Figure 1. Male palp and chelicera of Siamspinops yejiei sp. n., paratype. A palp, ventral; B ditto, retrolateral; C chelicera, posterior. Scale bars: 0.2 mm.

Figure 2. Siamspinops yejiei sp. n., A, C, E, F, H female holotype; B, D female paratype; G male paratype. A, B epigyne, ventral; C, D vulva, dorsal; E, G habitus, dorsal; F ditto, ventral; H tibiae, metatarsi and tarsi of left legs I and II, ventral. Scale bars: 0.2 mm (A-D); 1.0 mm (E-H).

Figure 3. The type locality of Siamspinops yejiei sp. n.