Althepus sepakuensis Li & Li

Li, Fengyuan, Liu, Chang & Li, Shuqiang, 2018, Ten new species of the spider genus Althepus Thorell, 1898 from Southeast Asia (Araneae, Ochyroceratidae), ZooKeys 776, pp. 27-60 : 38-39

Althepus sepakuensis Li & Li sp. n. Figs 14, 15, 20, 22

Types.

Holotype: ♂, Indonesia, East Kalimantan, Penajam, Paser Utara Town, Sepaku Village, on foot of Gunung Parung, 00°50.920'S, 116°46.284'E, 60 m a.s.l., 17.VIII.2014, H. Zhao and Z. Yao. Paratype: 1♀, same data as holotype.

Other material examined.

1♂, Indonesia, East Kalimantan, Penajam, Camp of International Timber Corporation of Indonesia, 01°05.291'S, 116°41.009'E, 64 m a.s.l., 17.VIII.2014, H. Zhao and Z. Yao.

Etymology.

The specific name refers to the type locality; adjective.

Diagnosis.

Males of A. sepakuensis Li & Li, sp. n. can be easily distinguished from all other known species of the genus by the widened, laminar embolus with a distal acuminate end (Figure 14B); females, by the six round spermathecae on slender stalks on each side (Figure 15A).

Description.

Male (holotype). Total length 4.23; carapace 1.33 length, 1.34 width; abdomen 2.25 length, 1.23 width. Carapace round, light yellow, with narrow, brown lateral margins and one wide, brown median band, the middle one wider than the others (Figure 15C). Anterior margin of cephalic region distinctly elevated. Clypeus brown. Cheliceral promargin with two teeth, followed by a lamina, retromargin with two small teeth (Figure 20H), posterior surface of fang with 19 small denticles. Labium brown. Sternum yellow, with two longitudinal brown bands. Abdomen elongate, with complex patterns dorsally and ventrally (Figure 15C). Legs brown, femur and tibia with white annulations. Leg measurements: I 37.7 (9.23, 0.53, 9.29, 15.77, 2.88), II 24.37 (6.35, 0.53, 6.03, 9.62, 1.84), III missing, IV 22.26 (6.41, 0.52, 5.90, 7.88, 1.55). Male palp (Figure 14 A–D): tarsus with one hooked spine with tip directed distally (Figure 14A); bristles at the top of cymbial protrusion (Figure 14A) as A. hongguangi Li & Li, sp. n.; bulb yellow, ovate; embolus arising distally from bulb, wide, curved, distal part abruptly acute to acuminate; conductor arising proximally from bulb, wide, distal part incurved; embolus and conductor widely separated (distance less than diameter of bulb).

Female (paratype). Total length 4.00; carapace 1.05 length, 1.09 width; abdomen 2.34 length, 1.32 width. Similar to male in colour and general features (Figure 15D, E) but smaller. Six rounded spermathecae on slender stalks, adjoined to a large pore-plate on each side (Figure 15E). Leg measurements: I 28.24 (6.54, 0.43, 6.72, 11.67, 2.88), II 17.45 (4.49, 0.43, 4.30, 6.60, 1.63), III 11.58 (3.36, 0.40, 2.81, 3.88, 1.13), IV 16.31 (4.55, 0.43, 4.25, 5.64, 1.44).

Distribution.

Indonesia. East Kalimantan, Penajam (Figure 22).

Natural history.

Collected in a lowland tropical forest.

Remark.

Althepus sepakuensis Li & Li, sp. n., was labelled as "sp. 131" in the analysis of Li and Li (2018).