Mesiotelus lubricus Simon 1880
Creators: name: Fu, Jianying
name: Zhang, Feng
name: Zhu, Mingsheng
Publisher: name: Zenodo
Year: 2008
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Liocranidae
Mesiotelus
Mesiotelus lubricus

description: <i>Mesiotelus lubricus</i> (Simon, 1880) Figs 1—13. <i>Liocranum lubricum</i> Simon, 1880: 122, pl. 3, f. 26—27(&amp;male; &amp;female;). Mesiotelus lubricus: Simon, 1897: 140, 143; Song &amp; Hubert, 1983: 14, f. 37—40(<i>&amp;male;</i> &amp;female;); Song, 1987: 328, f. 283(&amp;male; &amp;female;); Song et al., 1999: 411, f. 238M—N(<i>&amp;male;</i> &amp;female;); Song et al., 2001: 304, f. 193(&amp;male; &amp;female;). TYPE MATERIAL. <i>Liocranum</i> lubricum Simon, 1880: the type specimens are deposited in the Natural History Museum of Paris. They were examined by Prof. Daxiang Song (ca. 1979) and we consulted his original sketches. MATERIAL EXAMINED. 1 &amp;male; and 8 &amp;female;&amp;female; from Baishi Mountain, Laiyuan County, Hebei Province, China, April 30, 2008, F. Zhang and L.M. Zhu leg. (MHBU). 1 &amp;female; from Pingshan County, Hebei Province, China, May 21, 1986, W. S. Zhang leg. (MHBU). 3 &amp;female;&amp;female; from Zanhuang County, Hebei Province, China, June 13, 1998, F. Zhang leg. (MHBU). 2 &amp;female;&amp;female; from W u’an County, Hebei Province, China, May 18, 1999, F. Zhang leg. (MHBU). 2 &amp;female;&amp;female; from Linzhou County, Henan Province, China, May 11, 1999, F. Zhang leg. (MHBU) DIAGNOSIS. This species resembles the type species <i>M. tenuissimus</i> [cf. Kovblyuk <i>et al.,</i> 2008], but males can be distinguished by the longer thumb-shaped retrolateral tibial apophysis (retrolateral view), by the palpal tibia bearing a dorsal knob-shaped apophysis proximally, by the shape of additional tegular apophysis, by the relatively thin base of median apophysis; females by the posterior margin of epigynal scape being closer to genital fold. REDESCRIPTION. Male (Mt. Baishi, Hebei Province). Total length 3.72: carapace 1.55 long, 1.42 wide; abdomen 2.17 long, 1.32 wide. Carapace (Fig. 1) brown and smooth, without granulations or pits, elongate-ovoid in dorsal view, darker in eye area. Clypeus height 0.10, almost equal to AME diameter. Eye sizes and interdistances: AME 0.10, ALE 0.12, PME 0.10, PLE 0.10; AME—AME 0.16, AME— ALE 0.13, PME—PME 0.19, PME—PLE 0.19, ALE—PLE 0.16. MOA 0.19 long, front width 0.13, back width 0.19. Thoracic groove longitudinal, dark. Radial furrows indistinct, slightly dark. Chelicerae (Fig. 3) brown, with three promarginal and two retromarginal teeth. Endites (Fig. 2) brown, nearly rectangular, obliquely depressed, inner margin with a cluster of fine hairs. Labium (Fig. 2) as long as wide, with several long bristles distally. Sternum (Fig. 2) bright brown, posteriorly rounded between coxae IV. Legs brown; femur I with two dorsal and one prolateral macrosetae, tibia I with two pairs of long spines and two rows of short spines ventrally, metatarsus I with one pair of long spines ventrally; femur II with two dorsal macrosetae, tibia II with two pairs of long spines (prolateral spines longer) and two rows of short spines ventrally, metatarsus II with one pair of long spines ventral; femur III with two dorsal, one prolateral and one retrolateral macrosetae, tibia III with three pairs of ventral spines, two prolateral spines and one retrolateral spine; metatarsus III with one pair of ventral, one prolateral and one retrolateral spines; other segments have no spines, leg IV absent. Tarsal claws with four teeth. Measurements of legs: I 7.78 (1.13 + 1.80 + 2.07 + 0.78 + 2.00); II 6.58 (1.07 + 1.58 + 1.61 + 0.55 + 1.77); III 5.38 (0.65 + 1.32 + 1.35 + 0.61 + 1.45). Abdomen (Fig. 1) light brown dorsally, with two pairs of muscle impressions centrally and behind these, four white chevrons; paler ventrally and with white ring around spinnerets. Male palp (Fig. 10) very long: femur 0.78, patella 0.61, tibia (including apophysis) 0.84, tarsus (cymbium) 0.78. Palpal organ as illustrated (Figs 10—13): tibia with short prolateral lobe [Bosselaers &amp; Jocque, 2002] and longer thumb-shaped retrolateral apophysis terminally, and also with a dorsal knob-shaped apophysis proximally (Fig. 11); median apophysis (Fig. 12) retrolaterally, long flake-like and with thin base, brown, originating from tegulum centrally; additional tegular apophysis (Fig. 12) apically, brown and sclerotized, large and almost triangular from ventral view, with two pointed spine-like tips; embolus long, originating prolaterally, median part hidden behind additional tegular apophysis, tip near conductor; conductor apical, white, membranous (Figs 12—13), thin and flake-like; subtegulum small, almost hidden by tegulum, prolateral. Female (Mt. Baishi, Hebei Province). Total length 5.76: Carapace 2.16 long, 1.80 wide; abdomen 3.60 long, 2.25 wide. Eye sizes and interdistances: AME 0.13, ALE 0.14, PME 0.12, PLE 0.12; AME—AME 0.07, AME—ALE 0.03, PME-PME 0.13, PME-PLE 0.13. MOA 0.33 long, front width 0.30, back width 0.36. Clypeus height 0.13. Legs brown; femora I, II with two dorsal and one prolateral macrosetae (Fig. 5), tibiae I, II with two pairs of long and two rows of short spines ventrally, metatarsi I, II with one pair of ventral spines (Fig. 7); femora III, IV with two dorsal, one prolateral and one retrolateral macrosetae (Fig. 4), tibiae III, IV with three pairs of ventral spines, two prolateral spines and one retrolateral spine; metatarsi III, IV with three pairs of ventral spines, one prolateral spine and one retrolateral spine (Fig. 6); other segments have no spines. Measurements of palp and legs: palp 3.05 (0.86 + 0.66 + 0.72 + 0.81); I 8.29 (2.16 + 1.10 + 2.19 + 1.76 + 1.08); II 7.66 (2.03 + 1.07 + 1.90 + 1.67 + 0.99); III 7.03 (1.76 + 0.99 + 1.40 + 1.89 + 0.99); IV 9.99 (2.61 + 1.12 + 2.30 + 2.79 + 1.17). Leg formula: 4123. Epigynum as illustrated (Fig. 8), with almost triangular hairy plate; plate with pronounced, half-moon shaped hood anteriorly; with several transverse wrinkles centrally; copulatory openings concealed at sclerotized lateral margins; tongue-shaped epigynal scape posteriorly, close to genital fold. Vulva (Fig. 9) with very short copulatory ducts connected to copulatory openings and spermathecae; spermathecae posteriorly, both ball-shaped, sp1 larger than sp2 and sp1 fitted with single membranous fertilization duct. VARIATION. Females (n=15): body length: 4.94-6.32. Femur I prolateral spine: 0-1; femur II prolateral spines:1-2; femur III, IV retrolateral spines:1-2, prolateral spines:1-2. HABITIAT. Free-living ground-dwelling spiders inhabiting deciduous forest litter, debris, or humus on the shady temperate forest floor. All specimens were collected using a hand-made detritus sifter on forest litter. DISTRIBUTION. China (Hebei, Henan, Beijing).
description: Published as part of <i>Fu, Jianying, Zhang, Feng &amp; Zhu, Mingsheng, 2008, Redescription of a little-known spider species, Mesiotelus lubricus (Simon, 1880) (Aranei: Liocranidae) from China, pp. 169-173 in Arthropoda Selecta 17 (3)</i> on pages 171-173, DOI: 10.5281/zenodo.815376
description: {"references": ["Simon E. 1880. Etudes arachnologiques. 11 e Memoire. XVII. Arachnides recueilles aux environs de Pekin par M. V. Collin de Plancy // Ann. Soc. ent. Fr. Vol. 10. P. 97 - 128.", "Simon E. 1897. Histoire naturelle des araignees. Paris. Vol. 2. P. 1 - 192.", "Song D. X, Hubert M. 1983. A redescription of the spiders of Beijing described by E. Simon in 1880 // J. Huizhou Teachers Coll. Vol. 2. P. 1 - 23.", "Song D. X. 1987. Spiders from agricultural regions of China (Arachnida: Araneae). Beijing: Agriculture Publishing House. 376 pp.", "Song D. X., Zhu M. S, Chen J. 1999. The Spiders of China. Shijiazhuang: Hebei Science &amp; Technology Publishing House. 640 pp.", "Song D. X., Zhu M. S, Chen J. 2001. The Fauna of Hebei, China: Araneae. Hebei Science and Technology Publishing House. 510 pp.", "Kovblyuk M. M., Nadolny A. A., Gnelitsa V. A, Zhukovets E. M. 2008. Spiders (Arachnida, Aranei) of the Martyan Cape Reserve (Crimea, Ukraine) // Caucasian entomol. Bull. Vol. 4. No. 1. P. 3 - 40.", "Bosselaers J, Jocque R. 2002. Studies in Corinnidae: cladistic analysis of 38 corinnid and liocranid genera, and transfer of Phrurolithinae // Zool. Scripta. Vol. 31. P. 241 - 270."]}