Thaiderces fengniao Li & Chang

Chang, Wan-Jin & Li, Shuqiang, 2019, Fourteen new species of the spider genus Thaiderces from Southeast Asia (Araneae, Psilodercidae), ZooKeys 869, pp. 103-146 : 103

publication ID	https://dx.doi.org/10.3897/zookeys.869.35546
publication LSID	lsid:zoobank.org:pub:AFF62E38-4FD4-4E5D-9D92-3EC97E4A4368
persistent identifier	https://treatment.plazi.org/id/79BB2169-2674-4888-BF44-B77A406644F5
taxon LSID	lsid:zoobank.org:act:79BB2169-2674-4888-BF44-B77A406644F5
treatment provided by	ZooKeys by Pensoft
scientific name	Thaiderces fengniao Li & Chang
status	sp. nov.

Treatment

Thaiderces fengniao Li & Chang View in CoL sp. nov. Figs 1F View Figure 1 , 2D View Figure 2 , 18 View Figure 18 , 19 View Figure 19 , 27D View Figure 27 , 29 View Figure 29

Types.

Holotype: ♂ (IZCAS), Thailand, Kanchanaburi Province, Sai Yok District, Wang Krachae Subdistrict, unnamed Cave, 14°12.127'N, 99°01.195'E, 438 m, 1.XI.2014, Zhao H., Li Y., Chen Z. Paratype: 1♀ (IZCAS), same data as holotype.

Etymology.

The species name is a noun in apposition derived from the Chinese pinyin fēngniăo (hummingbird) and refers to the entire structure of the bulb, including the embolic stalk and laminar apophysis, resembling the head of a hummingbird.

Diagnosis.

Thaiderces fengniao sp. nov. is similar to T. haima sp. nov. but can be distinguished by a lighter color of pale yellow and purplish pattern as a whole (vs. rather darker color of brown pattern as a whole in T. haima sp. nov.), the embolic stubble is divided into two rows ( Fig. 19C View Figure 19 ) (vs. the embolic stubble is undivided in T. haima sp. nov.), presence of laminar apophysis adjacent to embolus ( Fig. 19C View Figure 19 ) (vs. the absence of laminar apophysis in T. haima sp. nov.), and the tibia is 2/3 the length of femur (vs. tibia almost equal to the length of femur in T. haima sp. nov.); females can be distinguished by a pair of short tubular spermathecae (vs. a pair of circular doublet spermathecae in T. haima sp. nov.).

Description.

Male (holotype). Total length 1.70; carapace 0.80 long, 0.78 wide; abdomen 0.90 long, 0.50 wide. Carapace round and brown, with 3 longitudinal dark brown bands, lateral bands four times wider than the median band ( Fig. 18C View Figure 18 ). Chelicerae brown ( Fig. 27D View Figure 27 ). Clypeus purplish medially and light brown laterally. Endites pale yellow. Labium brown. Sternum with purplish pattern. Abdomen elongated, dorsum with indistinct purplish pattern, posterior with dark purple stripes, ventrum with indistinct brown pattern. Legs uniformly brown; measurements: I 7.18 (1.87, 0.25, 2.18, 1.88, 1.00), II missing, III 5.72 (1.60, 0.25, 1.62, 1.50, 0.75), IV 9.63 (2.60, 0.31, 2.81, 2.66, 1.25). Palp ( Fig. 19 A–D View Figure 19 ): femur four times longer than patella; patella not swollen, tibia 2/3 the length of femur; cymbium lightly scattered with purplish spots, 1/3 the length of the femur; bulb light yellow, lanceolate with bent distal part, presence of two rows of embolic stubble on distal part of embolic stalk, embolic stalk half the width of bulb, embolus short, arising distally, with laminar apophysis adjacent to embolus, greatly resembles the head of hummingbird with the distinct beak ( Fig. 19C, D View Figure 19 ).

Female (Paratype). General features and coloration similar to that of male ( Fig. 18 D–E View Figure 18 ). Measurements: total length 1.85; carapace 0.75 long, 0.60 wide; abdomen 1.10 long, 1.00 wide. Leg measurements: I 6.80 (1.80, 0.25, 2.00, 1.75, 1.00), II 5.26 (1.40, 0.20, 1.56, 1.30, 0.80), III 4.35 (1.28, 0.20, 1.12, 1.13, 0.62), IV 6.18 (1.56, 0.20, 1.80, 1.62, 1.00). Endogyne: a pair of short, tubular spermathecae bent towards each other, with a length 2 times the width, ratio of interdistance between spermatheca and the width of spermatheca 1: 3.75 ( Fig. 18A View Figure 18 ).

Distribution.

Known only from the type locality ( Fig. 29 View Figure 29 ).