Lehtinenia arcus, Lin & Li, 2010

Lin, Yucheng & Li, Shuqiang, 2010, New armored spiders of the family Tetrablemmidae from China, Zootaxa 2440 (1), pp. 18-32 : 21-23

Lehtinenia arcus sp. nov.

Figs 9–18 , 50

Type material: Holotype: male ( IZCAS), Diaoluoshan Holiday Village (Alt.: 1010 m), Diaoluoshan Nature Reserve, Qiongzhong County [18°44´N, 109°52´E, Hainan, China], 16 August 2007, S.Q. Li and C.X. Wang leg. Paratypes: 8 males and 6 females, same data as holotype ( IZCAS) .

Other material examined. CHINA: Hainan: Lehtinenia bicornis Tong & Li, 2008 . Holotype: male, Mt. Wuzhishan , Wuzhishan City [18°82´N, 109°65´E, Hainan, China], 16 April 2005, Y.F. Tong, Y.J. Song, X. Han and G.Y. Deng leg. Paratypes: 1 male and 1 female, same data as holotype ( IZCAS) .

Etymology. This species name is from Latin arcus = arcuate, in reference to the shape of sclerotized lateral horn in female vulva.

Diagnosis. The new species can be distinguished from L. bicornis Tong & Li, 2008 by 1) the anteriorly special adorning of chelicerae, 2) the flattened and recurved embolus in male pedipalp, 3) the configuration of inner vulval plate and 4) the shape of lateral horn in female genitalia.

Description. Male: 1.18–1.24. Coloration reddish. Prosoma length 0.58–0.61, width 0.45–0.47, maximal height 0.46. Opisthosoma length 0.67–0.70, width 0.61–0.64. Six eyes in one group, ovoid, AME absent, ALE largest, PME smallest and almost invisible, posterior eye row recurved, ocular area black, slightly upheaved. Cephalic pars tiny granulated, horizontal in profile. Clypeus no modified. Dorsal shield of prosoma finely retiform mesially, strongly rugose marginally ( Figs 9, 10 ). Clypeal profile marginally nearly trigonal. Cheliceral apophyses small, situated at anterior center. Sternum sleek in center and retiform in margin, edge mightily rugose. Except for patellae, all femora, tibiae, metatarsi and tarsi with obviously annular veins. Leg measurements: I 1.26 (0.42, 0.14, 0.30, 0.22, 0.18); II 1.13 (0.36, 0.13, 0.26, 0.20, 0.18); III 1.02 (0.30, 0.12, 0.22, 0.20, 0.18); IV 1.32 (0.42, 0.14, 0.32, 0.24, 0.20). Leg formula: 4-1-2-3. Of opisthosoma dorsal scutum long oval, finely transversely striated. Lateral scutum I short, reached to the half lateral rim of pulmonary plate evidently pitted. Postgenital plate overlapped anterior margin of preanal plate, shorter than preanal plate in width. preanal plate nearly rectangular.

Pedipalpal bulb normal pear-shaped. Flat embolus distinctly sclerotized, originated from the apex of pyriform palpal bulb, and outward bending at middle. Embolus perpendicular to the end of bulb ( Figs 13–15 ).

Female: 1.22–1.30. Prosoma length 0.56–0.60, width 0.42–0.46, maximal height 0.41–0.43. Opisthosoma length 0.72–0.78, width 0.62–0.68. Female body and legs modifications similar as in male, ocular area no upheaved, dorsal shield of prosoma relatively longer than in male, chelicerae without apophysis and clypeus marginally nearly rounded ( Fig. 16 ). Leg measurements: I 1.26 (0.42, 0.14, 0.28, 0.22, 0.20); II 1.17 (0.38, 0.13, 0.26, 0.22, 0.18); III 1.06 (0.34, 0.12, 0.22, 0.20, 0.18); IV 1.40 (0.44, 0.14, 0.36, 0.24, 0.22). Leg formula: 4-1-2-3. One pair of perigenital plates, slightly larger than in male. One pair of flake-shaped apophyses on posterior margin of preanal plate. Epigynal fold clearly visible. A fold at between of postgenital and preanal plate. Postgenital plate narrower than preanal plate ( Fig. 17 ).

Epigynal pit small. Vulval stem and lateral horns strongly sclerotized, together into a integrated arch. Distally lateral horn reached and fused to the posterior margin of pulmonary plate. Vulval duct rugose and membranous. Central process absent. Inner vulval plate vertically club-shaped, widen at basal and distally truncated ( Fig. 18 ).

Natural history. This spider likes to live in the wet left litter under tropical shrub.

Distribution. Known only from the type locality ( Fig. 50 ).

Figures

FIGURE 50. Locality records of tetrablemmid species in China.

FIGURES 9–15. Lehtinenia arcus sp. nov. 9–11 Male prosoma (9 lateral, 10 dorsal, 11 ventral, 12 anterior view); 13–14 Male left pedipalp (13 prolateral, 14 retrolateral view); 15 Male pedipalpal bulb, anterior view. Scales: 0.1 mm

FIGURES 16–18. Lehtinenia arcus sp. nov. 16 Female prosoma, lateral view; 17 Female opisthosoma, ventral view; 18 Female genital area (KOH-treated), ventral view. Scales: 0.1 mm