Siamspinops banna Lin & Li, 2022

Siamspinops banna Lin & Li , sp. nov. ( Figs 35–37 View Figure 35 View Figure 36 View Figure 37 )

Diagnosis. Males of the new species are similar to S. formosensis (Kayashima, 1943) by the T-shaped conductor and embolus arising from the 9-o’clock-position of the tegulum ( Yu et al., 2019, figs 1–17), but can be distinguished by having the median apophysis folded outward in a pocket shape ( vs. median apophysis straight in S. formosensis ), the dorsal retrolateral tibial apophysis is two times longer than the ventro-retrolateral tibial apophysis ( vs. 1.5 times in S. formosensis ) and the terminus of the dorsal retrolateral tibial apophysis is enlarged and racket shaped ( vs. flat in S. formosensis ). Females of the new species resemble those of S. spinescens Dankittipakul & Corronca, 2009 by the long accessory lobe of spermatheca, but in the former species the epigynal pockets are contiguous and median septum absent ( vs. epigynal pocket separate and median septum present in S. spinescens ).

Description. Male ( holotype, Fig. 37A View Figure 37 ). Total length 4.26; carapace 1.99 long, 2.53 wide; abdomen 2.25 long, 2.10 wide. Carapace yellow, lateral margins yellowish-brown. Eye sizes and interdistances: AME 0.12, ALE 0.08, PME 0.13, PLE 0.18, AME–AME 0.13, AME–ALE 0.28, PME–PME 0.46, PME–PLE 0.23, ALE–PLE 0.15. Chelicerae yellow, with 3 retromarginal teeth and 1 promarginal tooth; labium and maxillae yellow; sternum yellow, lateral margins brown; legs pale yellow, with greyish spots. Leg measurements: I 8.13 (2.45, 2.87, 1.93, 0.88), II 11.46 (3.63, 4.18, 2.61, 1.04), III 11.16 (3.79, 4.00, 2.43, 0.94), IV 8.35 (3.11, 2.58, 1.88, 0.78). Leg formula 2341. Abdomen yellow with brown pattern.

Palp ( Fig. 35 View Figure 35 ). Patella without apophysis. Palpal tibia two times longer than patella. Retrolateral tibial apophysis with two branches, ventro-retrolateral tibial apophysis small, slightly curved, dorsal retrolateral tibial apophysis two times longer than ventro-retrolateral tibial apophysis, terminus enlarged. Bulb relatively round, with basolateral excavation below embolic base. Conductor T-shaped. Embolus filiform.

Female (IZCAS-Ar43292, Fig. 37B View Figure 37 ). Total length 6.00; carapace 2.34 long, 2.50 wide; abdomen 3.73 long, 2.57 wide. Eye sizes and interdistances: AME 0.13, ALE 0.08, PME 0.16, PLE 0.23, AME–AME 0.14, AME–ALE 0.33, PME–PME 0.50, PME–PLE 0.25, ALE–PLE 0.15. Leg measurements: I 5.02 (1.75, 1.98, 0.86, 0.43), II 7.35 (2.51, 3.19, 1.01, 0.64), III 7.13 (2.28, 3.13, 1.07, 0.65), IV 7.23 (2.76, 2.57, 1.25, 0.65). Leg formula 2431. Habitus similar to that of male.

Epigyne ( Fig. 36 View Figure 36 ) with epigynal pocket, copulatory opening conspicuous, arc-shaped. Copulatory duct inconspicuous. Spermathecal head longer than spermatheca, terminus expanded. Spermatheca strongly convoluted, with 8 coils; fertilization ducts leaf shaped.

Material examined. Holotype ♂ (IZCAS-Ar43287), Yunnan, Xishuangbanna Dai Autonomous Prefecture, Mengla County, Menglun Township , G213 road, Banyan tree ( 21.9015°N, 101.2837°E, elev. 579 m), 28 November 2009, G. Tang and Z. Yao leg. GoogleMaps Paratypes. 1♂ (IZCAS-Ar43288), Yunnan, Xishuangbanna Dai Autonomous Prefecture, Mengla County, Menglun Township , G213 road, Secondary forest ( 21.9076°N, 101.2792°E, elev. 644 m), 20 November 2009, G. Tang and Z. Yao leg. GoogleMaps ; 1♂ (IZCAS-Ar43289), Yunnan, Xishuangbanna Dai Autonomous Prefecture, Mengla County, Menglun Township , G213 road, Bamboo plantation ( 21.8941°N, 101.2829°E, elev. 589 m), 26 November 2009, G. Tang and Z. Yao leg. GoogleMaps ; 1♂ (IZCAS-Ar43290), Yunnan, Xishuangbanna Dai Autonomous Prefecture, Mengla County, Menglun Township , G213 road, Bamboo plantation ( 21.9064°N, 101.2800°E, elev. 627 m), 22 November 2009, G. Tang and Z. Yao leg. GoogleMaps ; 1♀ (IZCAS-Ar43291), Yunnan, Xishuangbanna Dai Autonomous Prefecture, Mengla County, Menglun Township , Primary tropical seasonal rain forest ( 21.9172°N, 101.2750°E, elev. 558 m), 1–15 February 2007, G. Tang leg. GoogleMaps ; 1♀ (IZCAS-Ar43292), Yunnan, Xishuangbanna Dai Autonomous Prefecture, Mengla County, Menglun Township , G213 road, Bamboo plantation ( 21.8940°N, 101.2823°E, elev. 580 m), 3 December 2009, G. Tang and Z. Yao leg. GoogleMaps

Distribution. Known only from the type locality.

Etymology. The specific name is a noun in apposition taken from the type locality.