Althepus xianxi Li et Li

Liu, Chang, Li, Fengyuan, Wongprom, Prasit, Zheng, Guo & Li, Shuqiang, 2017, Eleven new species of the spider genus Althepus Thorell, 1898 (Araneae, Ochyroceratidae) from Thailand, Zootaxa 4350 (3), pp. 469-499: 494

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Althepus xianxi Li et Li

sp. nov.

Althepus xianxi Li et Li  sp. nov.

Figs 19–22View FIGURE 19View FIGURE 20View FIGURE 21View FIGURE 22

Type material. Holotype: Male ( IZCAS) Thailand, Yala Province, Betong District, Ban Bo Nam Ron Village . 05°49.960'N, 101°04.080'E, altitude 384m, 24 October 2015GoogleMaps  . Paratypes: 2 females and 2 males, same data as holotype ( IZCAS)GoogleMaps  .

Etymology. The specific name is derived from the Chinese pinyin 'xiān xì', which means 'slender', referring to the slender spermathecae; noun in apposition.

Diagnosis. The species resembles A. jiandan  sp. nov. ( Figs 6–7View FIGURE 6View FIGURE 7) with the male palp, but can be distinguished by the small conductor ( Figs 19A –DView FIGURE 19) as well as by the loosely twisted spermathecae ( Fig. 20EView FIGURE 20).

Description. Male (holotype). Total length 3.22; carapace 1.09 length, 1.41 width; abdomen 1.83 length, 0.88 width. Carapace rounded ( Fig. 20GView FIGURE 20), yellow, with narrow marginal bands and one wide median band. Anterior margin of thoracic region distinctly elevated. Clypeus brown. Cheliceral promargin with two teeth, followed by a lamina, retromargin with two small teeth ( Fig. 21KView FIGURE 21). Labium black-brown. Sternum brown. Abdomen elongate, with complex patterns of white and dark-brown dorsally and ventrally. Legs brown, femur and tibia annulated with white. Leg measurements: I missing, II 21.27 (5.77 0.50, 5.64, 8.01, 1.35), III 13.16 (3.85, 0.50, 3.59, 4.49, 1.03), IV 20.82 (5.83, 0.50, 5.71, 7.50, 1.28). Male palp ( Figs 19A –DView FIGURE 19): tarsus with three slightly curved, serrated bristles at the top of cymbial protrusion ( Fig. 19DView FIGURE 19), one spine slightly bent with tip directed towards proximally ( Fig. 19AView FIGURE 19); one strong spine and one bristle arising from tubercles; bulb dark yellow, ovate; embolus arising retrolatero-distally from bulb, curved and extremely long proximally; conductor arising prolatero-proximally from bulb, with forked structures on the distal part; embolus and conductor widely separated (the distance is almost equal to diameter of bulb).

Female (paratype). Similar to male in coloration and general features ( Figs 20H –IView FIGURE 20), but with a smaller body size. Internal genitalia with a pair of loosely twisted transparent spermathecae ( Fig. 20EView FIGURE 20). Measurements: total length 3.00; carapace 0.88 length, 1.06 width; abdomen 1.75 length, 1.00 width. Legs I 22.89 (5.45, 0.38, 6.03, 8.72, 2.31), legs II missing, III 9.99 (2.88, 0.38, 2.56, 3.21, 2.37), IV 13.97 (3.97, 0.38, 3.85, 4.49, 1.28).

Variation. Carapace 1.00–1.09 length, 1.19–1.41 width, tibia I 5.38–8.72 (leg I lost in male holotype) in males; Carapace 0.88–0.94 length, 1.06–1.09 width, tibia I 6.03 (leg I lost in other specimen) in females.

Distribution. Known only from the type locality ( Fig. 22View FIGURE 22).


Institute of Zoology, Chinese Academy of Sciences