Sesieutes longyangensis, Zhao & Peng, 2013

Zhao & Peng, 2013, Three new species of spiders of the family Liocranidae (Arachnida: Araneae) from China, Oriental Insects 47 (2), pp. 176-183 : 180-182

3. Sesieutes longyangensis sp. nov. ( Figures 3 , 6 )

Description

Male carapace dark brown, without pattern or hair, its entire surface covered with fine tubercles. Anterior eye row slightly recurved, posterior eye row straight, slightly wider. Fovea indistinct. Sternum reddish brown, without pattern. Chelicerae 0.75 long, coloured as sternum, with lateral condyle, two promarginal and two retromarginal teeth. Labium as long as wide. Legs with femur coloured as carapace, and other segments pale; tibiae I and II yellowish distally, with seven and six pairs of long, ventral spines, respectively, with longest spine 0.72 long; metatarsi I and II with four pairs of long ventral spines, longest spine 0.57 long; femur I with two, strong, retrolateral spines. Opisthosoma elongate oval, with black hair. Dorsum coloured as carapace, with two pairs of muscular impressions, and two pale, transverse arc-shaped bands located at anterior and posterior one-third, respectively, its posterior end with a short, conical, white apophysis ( Figure 3 (a)). Venter reddish brown, and its median area with an anchor-shaped, white pattern. Spinnerets cylindrical, yellowish brown, with anterior ones as long as posterior.

Palpal organ with tibia as long as wide (0.35), with three apophyses, of which two are ventral ( Figures 3 (b),(d), 6 (a),(c)) and one dorsal ( Figures 3 (c), 6 (b)). Cymbium 1.10 long, 0.52 wide, its terminal portion with scopula ( Figures 3 (c),(d)). Genital bulb pear shaped, with a white, spherical, membranous structure close to the base of conductor ( Figures 3 (c),6(b)), subtegulum visible in prolateral view ( Figures 3 (c), 6 (b)), embolus clearly visible in ventral and prolateral views ( Figures 3 (b),(c), 6 (a),(b)), conductor short, slightly bent, with distinct incision in prolateral view ( Figures 3 (c), 6 (b)). Sperm-duct visible in retrolateral view ( Figures 3 (b),(d), 6 (a),(c)).

Measurements. Male total length 5.70. Carapace 2.75 long, 2.15 wide. Clypeus height 0.15. Opisthosoma 2.80 long, 1.67 wide. AME 0.12, ALE 0.11, PME 0.10, PLE 0.11, AME – AME 0.07, AME – ALE 0.06, AME – PME 0.08, PME – PME 0.12, PME – PLE 0.13, ALE– PLE 0.10. Leg I 8.04 (2.30, 2.99, 1.75, 1.00), II 7.15 (2.10, 2.60, 1.50, 0.95), III 6.11 (1.72, 2.04, 1.45, 0.90), IV 8.57 (2.30, 2.75, 2.35, 1.17), formula: IV, I, II, III.

Holotype

m, China: Yunnan Province, Longyang County, Bawan Township, Ganlin He at Baihua Village , 24.84100 ° N, 98.89140 ° E, 700m, 1.vi.2005, Coll. Heng-mei Yan and Ke-ji Guo, collected by beating vegetation ( GKJ0 35 – 1 , HNU) .

Etymology

The specific name is derived from the type locality.

Comments

This new species is similar to S. thakek ( Jager 2007: Figures 73– 75) but distinct in its (1) embolus clearly visible in both ventral and prolateral views ( Figures 3 (b),(c), 6 (a),(b)) (vs. invisible) and (2) conductor much longer and with distinct incision in prolateral view ( Figures 3 (c), 6 (b)) (vs. absent).

Figures

Figure 3. S. longyangensis sp. nov. male: a, habitus, dorsal view, scale bar 1 mm; b – d, left palp: b, ventral view; c, prolateral view; d, retrolateral view, scale bars 0.1 mm.

Figure 6. S. longyangensis sp. nov. left palp: a, ventral view; b, prolateral view; c, retrolateral view, scale bars 0.1 mm.