Sesieutes schwendingeri, 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 : 461-463

publication ID 10.5281/zenodo.814704


persistent identifier

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scientific name

Sesieutes schwendingeri

sp. nov.

Sesieutes schwendingeri sp. n. ( figs 771-774 View Figs 771 - 774 , map 38 View Map 38 )

Type locality. — N Thailand, Doi Chiang Dao, 450-1500 m (see also under distribution).

Type material.— Holotype ♂ ( MHNG) from the type locality, limestone mountain 5 km west of Chiang Dao village, pitfall traps in evergreen forest , 510 m, 22.ix-25.x.1990, P.J. Schwendinger; paratypes: 1 ♀, same data, 450 m, 7.iii. 1987 ( MHNG), 1 ♀ ( CD), 510 m 25. x.1987 , 1 9, 510 m, 15.i-23. ii. 1991 , 1 ♀, Doi Chiang Dao, Huay Mae Kok, deciduous and pine forest , 1500 m, 27.i. 1996, all P.J. Schwendinger ( MHNG) .

Other material.— Doi Suthep, granite mountain west of Chiang Mai, about 60 km S of Doi Chiang Dao, evergreen forest , 1 ♂ ( CD), 960 m, pitfall traps, 31.xi. 1986 - 2. i.1987, 1 ♀, 1200 m, 18. vi.1987 , 1 ♀ ( CD), 1180 m, 2.viii-29. viii. 1987, 1 ♀ ( MHNG), 1180 m, 29.viii-2. x. 1987 , 1 ♀ ( MHNG), Doi Suthep , 950 m, 30.vii-30.viii.1986, all P.J. Schwendinger .

Diagnosis. — A large and dark species, distinguished by the short dorsal scutum in males which is absent in females, the absence of collar, and by the genital organs. The embolus is curved in a long sling behind the tegulum. The male is very similar to Sesieutes erawan , differences see there.

Description.— MALE, holotype. Total length 7.30 mm, male from Suthep 6.40 mm, carapace length 3.50 mm, width 2.70 mm, height at coxae II 0.70 mm, head width 1.50 mm, width eye group 0.90 mm; abdomen 3.80 mm long, 2.10 mm wide. Leg lengths: leg I 9.50 mm (2.70-3.50-2.10-1.20), leg II 8.20 mm (2.50-3.00-1.80-0.90), leg III 7.10 mm (2.00­ 2.40-1.80-0.90), leg IV 11.00 mm (3.00-3.50-3.00-1.50), palp 1.00-0.50-0.60 including apophysis- 1.50 mm. Carapace, sternum and mouthparts dark reddish brown, covered with dense granulations, legs dark, apex of tibiae I and IV light, metatarsi and tarsi pale brown. Dorsal and lateral surface of abdomen dark grey, in the middle dorsally a pair of large transversely oval white spots with a dark dot in the middle which are not continued laterally and underneath, behind these 3-4 white chevrons and a white pre-anal spot; spinnerets white. Ventral side of abdomen dark with a pair of parallel white stripes, flanked on either side by a slightly sinuated line of white spots. Head relatively narrow with sides converging; thoracic groove a deep round pit. d AME = d ALE, PER slightly recurved, PME separated by their d, slightly smaller than PLE and separated from these by 1 d PLE. Coxa IV without conical protuberance. Leg spination: femur I with 2 strong pl spines, other femora spineless, tibia I with 7pv and 8rv or 8pv and 7rv, tibia II with 7pv and 6rv, tibia III with l-2v, 0-1 pl, tibia IV with 1-2+2ap, 0-1 rl, metatarsus I with 5 pairs ventrally, metatarsus II with 4, metatarsus III with 2-1v, 1-0-0pl, metatarsus IV with 2-2v, 1-0-0pl, 1-0-0rl. Dorsal scutum over 1/3 abdominal length. Ventral scutum without collar. Palp figs 771-772 View Figs 771 - 774 and diagnosis.

FEMALE, paratype. Total length 8.80 mm, other females: Doi Chiang Dao 8.50-9.00 mm, Suthep 7.20-9.00 mm. Carapace length 3.80 mm, width 3.00 mm, head width 1.70 mm, width eye group 1.10 mm; abdomen 4.50 mm long, 2.60 mm wide, epigyne 0.70 mm wide, 0.70 mm long. Leg lengths: leg I 10.60 mm (3.00-4.00-2.40-1.20) leg II 9.20 mm (2.70-3.30-2.00-1.20), leg III 7.80 mm (2.20-2.50-2.00-1.10), leg IV 11.50 mm (3.00­ 3.90-3.10-1.50), palp 1.10-0.60-0.70-1.00 mm. Carapace, eyes, mouthparts, sternum and legs as in ♂. Sometimes more legs spines than in males. Abdomen without dorsal scutum, pattern as the male, but more diluted; often (in Chiang Dao and Suthep) a broad V-shaped pale stripe towards flanks. Epigyne ( fig. 773 View Figs 771 - 774 ) with very large central openings and wide arched entrance tube, duct with one small and then one large coil towards spermathecae; entrance tubes both filled with black substance; spermathecae without visible contents. Vulva fig. 774 View Figs 771 - 774 .

Distribution.— At present known from Doi Chiang Dao and Doi Suthep in N Thailand from 450 to 1500 m.

Notes on type locality.— Doi Chiang Dao is a limestone mountain (3rd highest in Thailand) and a wildlife Sanctuary, usually not indicated on maps) about 5 km west of Chiang Dao village, 60 km north of Chiang Mai. It consists of evergreen gallery forests at the foot of the mountain at 450-500 m; higher up there is deciduous and pine forest. Doi Suthep is a granite mountain and National Park; it lies just outside Chiang Mai city to the west; above 1000 m there is evergreen hill forest (data communicated by P. Schwendinger).

Etymology.— A patronym, after the collector P.J. Schwendinger, in recognition for allowing me to study his extensive and valuable ground spider material from Thailand.


Switzerland, Geneva, Museum d'Histoire Naturelle













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