Thaiderces jian Li & Li, 2017

Liu, Chang, Li, Fengyuan, Li, Shuqiang & Zheng, Guo, 2017, Five new genera of the subfamily Psilodercinae (Araneae: Ochyroceratidae) from Southeast Asia, Zoological Systematics 42 (4), pp. 395-417 : 411

publication ID

https://doi.org/ 10.11865/zs.201717

publication LSID

lsid:zoobank.org:pub:286CFD9F-1456-4772-B3D5-8A13FF24A9F1

DOI

https://doi.org/10.5281/zenodo.4617661

persistent identifier

https://treatment.plazi.org/id/BB6787BC-1723-E60E-FF08-30E9C715F894

treatment provided by

Carolina

scientific name

Thaiderces jian Li & Li
status

sp. nov.

Thaiderces jian Li & Li View in CoL , sp. nov. ( Figs 11–12 View Figure 11 View Figure 12 , 15 View Figure 15 )

Material examined. Holotype male, Thailand, Yala Province, Than To District, evergreen forest in front of Krasaeng Cave entrance (6º10.868’N, 101º11.605’E; elev. 155 m), 10 October 2015, leg. Q. Zhao, G. Zhou & Z. Chen. GoogleMaps Paratype. 1 female, same data as holotype ( IZCAS) GoogleMaps .

Etymology. The species name is a noun in apposition derived from the Chinese pinyin "jǐan" ("simple") and refers to the simple structure of the male palp.

Diagnosis. The males of the two species of Thaiderces Li & Li , gen. nov. are very similar but can be distinguished as follows. The embolus of this species is relatively slender basally and the needle-like tip is smoothly curved ( Figs 11 View Figure 11 A–D) (versus relatively thick basally and with a slightly sinuous tip in T. vulgaris ). The female of this species is easily distinguished by the relative length of the pairs of spermathecae: the medial spermathecae are elongate, the lateral spermathecae are greatly reduced ( Fig. 12A View Figure 12 ).

Description. Male (holotype). Total length 1.41; carapace 0.52 long, 0.51 wide; abdomen 0.75 long, 0.44 wide. Carapace round, brown, with two yellow longitudinal bands ( Fig. 12C View Figure 12 ). Fovea shallow, brown. Anterior margin of thoracic region distinctly elevated. Chelicerae yellow with brown spots. Cheliceral promargin with dentoid lamina and no teeth, retromargin with two small teeth, posterior surface of fang with 15 small denticles. Clypeus slanting, pale brown. Labium slanting, brown. Sternum mostly brown with some small yellow areas. Abdomen elongate, light brown, with some yellow patterns dorsally and ventrally. Legs pale brown; measurements: I 5.58 (1.48, 0.20, 1.60, 1.50, 0.80), II 4.54 (1.25, 0.20, 1.25, 1.19, 0.65), III 3.60 (1.00, 0.20, 0.99, 0.94, 0.47), IV 5.31 (1.41, 0.21, 1.53, 1.41, 0.75). Palp ( Figs 11 View Figure 11 A–D): cymbium simple, unmodified; bulb pale yellow, oval; conductor lacking; embolus arising subapically from bulb, with relatively slender base and smoothly curved, needle-like tip.

Female. Similar to male in coloration and general features but slightly larger ( Figs 12 View Figure 12 D–E). Measurements: total length 1.60; carapace 0.61 long, 0.54 wide; abdomen 1.05 long, 0.71 wide. Leg measurements: I missing, II - (1.03, 0.22, 1.17, 1.64, -), III 3.02 (0.80, 0.20, 0.79, 0.82, 0.41), IV missing. Vulva with elongate medial spermathecae and very short lateral spermathecae ( Fig. 12A View Figure 12 ).

Distribution. Known only from the type locality ( Fig. 15 View Figure 15 ).

IZCAS

Institute of Zoology, Chinese Academy of Sciences

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Psilodercidae

Genus

Thaiderces

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