Sesieutes scrobiculatus, Deeleman-Reinhold, Christa, 2001

Deeleman-Reinhold, Christa, 2001, Forest Spiders of South East Asia With a revision of the sac and ground spiders (Araneae: Clubionidae, Corinnidae, Liocranidae, Gnaphosidae, Prodidomidae and Trochanteriidae)., Forest Spiders of South East Asia With a revision of the sac and ground spiders- Family Liocranidae, Leiden, Netherlands: Brill Leiden; Boston; Köln, pp. 400-505 : 449-451

Sesieutes scrobiculatus sp. n. ( figs 736 , 739-743, map 38 )

Type locality. — N Sumatra, Gunung Leuser National Park at Bohorok rehabilitation Centre near Bukit Lawang .

Type material.— Holotype ♂ from the type locality, undisturbed primary forest along trail 6, leaf litter around tree roots, 11.vi. 1983, PR. and C.L. Deeleman; paratypes: 1 ♀, 9.viii. 1982, and 1 ♀ 1.i. 1984, same data, C.L. and PR. Deeleman; 1 ♀ in leaf litter alongside river Bohorok , 24.iv. 1983, S. Djojosudharmo .

Other material.— None.

Diagnosis.— Closely related to S. lucens , the male differs from the male of that species by the carapace being entirely covered with fine granulations and the AME scarcely larger than ALE. The distalmost tibial apophysis of the male palp is finer, bent distally and it is not much longer than the proximalmost ( fig. 736 ); the proximalmost apophysis is directed parallel to the distalmost rather than perpendicular as in lucens and the tip is more evenly rounded, enclosing with the distalmost a U-shaped space. S. scrobiculatus differs from nitens by the granulated surface and the longer narrower proximal tibial apophysis in the male. In the epigyne, the openings are unpaired and located anteriorly, and the insemination ducts are regularly convex. Both species from Borneo have a more angular, conical proximal apophysis and in the Bornean females the epigyne has the openings situated laterally.

Description.— MALE. Total length 5.30 mm. Carapace length 2.45 mm, width 1.72 mm, height 1.00 mm, width head 1.00 mm, width eye region 1.65 mm; abdomen length 2.60 mm, width 1.60 mm. Leg length: leg I 6.55 mm (1.85-2.40-1.40-0.90); leg II 5.85 mm (1.60-2.13-1.20-0.92); leg III 5.15 mm (1.40-1.75-1.20-0.80); leg IV 7.20 mm (2.00-1.80- 2.10-1.30), palp 0.80-0.32-0.28+0.20-1.00 mm. Colour as female, the male cannot be assessed at that point as it was captured shortly after moult and is still pale in colour. Carapace covered with dense rows of seta-bearing granules. Femora dark chestnut, rest of legs paler, tibiae with distal wide dark band and light apical ring. AER straight, AME scarcely larger than ALE, all separated by 1/2 d; PER straight, eyes equally spaced, d PME = 1/2 d ALE. Clypeus width 1 d AME, central lobe of clypeus prominent. Femur I 0-1 pl, femur IV l-0d, tibia I 7 pv, 6rv, tibia II 6 pv, 5rv, tibia III 1-1 pv, 1-1 rv, tibia IV 1-1 -1 pv, 1-1-1 rv, 0-1-0pl, 0-1-0rl, metatarsus I 2-2 -2-2v, metatarsus II 2-2 -2v, metatarsus III 1 -0pv, 1-0 rv, 1-0rl, metatarsus IV 2-2v, 1-0pl, 1-0rl; tarsal claw I with 5 teeth, IV with 3 teeth. Abdominal collar with 2-3 shallow grooves. Abdomen entirely covered with dorsal scutum except for small white area in front of the spinnerets. Male palpal tibia figs 736 , 739-740 , and diagnosis; embolus short, in apical coil.

FEMALE. Length 6.40 mm. Carapace length 2.90 mm, width 2.20 mm, head width 1.40 mm; abdomen length 3.65 mm, width 2.08 mm, epigyne 0.45 mm wide, 0.50 mm long. Leg lengths: leg I 8.05 mm (2.25-3.00-1.70-1.10), leg II 6.85 mm (1.90-2.50-1.50-0.95), leg III 5.90 mm (1.65-2.00-1.40-0.85), leg IV 9.25 mm (2.80-1.95-3.20-1.30), palp 1.00- 0.44-0.76- 0.92 mm. Carapace, mouthparts and sternum dark chestnut, for the rest as male. Abdomen dorsally with scutum over 2/3 - 3/4 of the length, in the middle a pair of slightly paler diagonal bands with a black dot in the middle; small pre-anal area and posterior spinnerets white. Spine formula as male, but tibia I with 8pv, 7rv, tibia II 7 pv and 6 rv, metatarsus II 4 pv and 4rv. Spinnerets fig. 743 . Epigyne ( fig. 741 ) with single opening anteriorly, leading through winding sclerotized ducts into posterior spermathecae ( fig. 742 ).

Distribution.— Found in the forest at the Bohorok rehabilitation centre near Bukit Lawang. In Ketambe, in the centre of the Gunung Leuser Park, the species was not found during a prospection at weekly intervals through the years 1983-1986.

Etymology.— The word scrobiculated means: having a surface covered with small pits and grooves, from Latin scrobiculus, dimunitive of scrobis, a ditch.

Figures

Map 38: (I) Sesieutes lucens ▲ S. scrobiculatus ▼ S. nitens ■ S. borneensis ● S. bulbosus ☆ S. minor ⁎ S. em cincipatus ◙ S. schwendingeri ★ S. erawan Ө Unidentified specimen 1 -

Figs 734 - 736. Sesieutes lucens, male holotype. 734. right palp, retrolateral. 735. Left palp, tibia, dorsal-retrolateral. 736. S. scrobiculatus, left palpal tibia. 737. S. bulbosus, left palpal tibia. 738. S. borneensis, left palpal tibia. 739 - 743. Sesieutes scrobiculatus sp. n. 739. M ale palp, ventral. 740. Palp, retrolateral. 741. Epigyne. 742. Vulva, in clove oil, dorsal. 743. Fem ale, spinnerets, ventralcaudal. 744. Sesieutes nitens sp. n., female, head.