Olios diao, Jäger, Peter, 2012

Jäger, Peter, 2012, New species of the spider genus Olios Walckenaer, 1837 (Araneae: Sparassidae: Sparassinae) from Laos, Zootaxa 3228, pp. 61-68 : 62-63

Olios diao spec. nov.

Figs 1-4, 13-16, 27, 29

Type material: Holotype: male, LAOS, Bolikhamsay Province, Nam Kading National Protected Area, Tad Vang Fong Training Centre , N 18°20 ’28.8’’, E 104°08 ’37.5’’, 150 m altitude, secondary forest, in foliage, 25 March 2011, by night, by hand, P. Jäger & L. Nophaseud leg. ( SMF, PJ 3356, SD 744 ) .

Etymology. The Lao word “diao” means "single, lone", stressing that in this genus mostly single specimens are collected; term in apposition.

Diagnosis. Small (assumed: to medium-sized) Sparassinae (total length male 9.7). Males exhibit a transversal embolus loop, which is also present in O. scalptor Jaeger and Ono, 2001, O. jaenicke spec. nov. and O. nanningensis (Hu & Ru, 1988), the latter known from southern China. It is distinguished from other Olios spp . by the distal embolus tip with a transversal structure, by the pointed, triangular tegular apophysis close to conductor, and by the extended proximal tegulum with a hump with granules (Figs 1-4).

Description. Male: PL 4.9, PW 4.6, AW 2.5, OL 4.8, OW 3.2. Eye diameters and interdistances: AME 0.37, ALE 0.31, PME 0.28, PLE 0.28, AME-AME 0.17, AME-ALE 0.08, PME-PME 0.40, PME-PLE 0.39, AME-PME 0.30, ALE-PLE 0.23, clypeus AME 0.16, clypeus ALE 0.23. Palp and leg measurements: palp 6.3 (2.0, 0.7, 1.1, -, 2.5), I 26.2 (7.2, 2.7, 7.3, 7.1, 1.9), II 28.6 (7.7, 2.8, 8.2, 7.9, 2.0), III 17.7 (5.6, 2.2, 5.2, 5.0, 1.4), IV 22.6 (6.5, 2.1, 6.0, 6.3, 1.7). Leg formula 2143. Spination of palp and legs: palp 131, 120 (bristles), 0011(with one dorsal bristle); femora I-IV 323 ( IV: proximal retrolateral 2 distinctly smaller); patellae I-IV 100; tibiae I-IV 2124; metatarsi I-III 2024, IV 3026. Metatarsus IV distally with small ventral spine, few bristles and scopula. Scopulae on tibia and tarsus I-IV wide, largest width of scopula at metatarsus II: 1.4; metatarsus II width: 0.3. Chelicera with 2 anterior, 5 (right) and 4 (left) posterior teeth, and without denticles.

Palpus as in diagnosis. Embolus arising in a 7.30- o’clock-position from tegulum, running a semicircle, bent distally to an oval; conductor concave, arising prolatero-centrally from tegulum. Tegular apophysis, triangular in ventral view, situated proximo-centrally. RTA tapered, slightly curved in ventral view. Dorsal cymbium with scopula in distal half. Cymbium elongated oval.

Colouration in ethanol (Figs 13-16). Yellow brown with dark reddish brown markings on OS. Dorsal shield of prosoma without pattern, fovea long, reddish brown. Sternum, ventral coxae, and gnathocoxae pale yellowish-brown. Labium proximally darker, distally pale yellowish-brown as other ventral parts. Chelicerae as dorsal shield, distally slightly darker. Legs as dorsal shield, becoming darker distally. Dorsal opisthosoma with indistinct pattern consisting of two rows of small patches beside heart row of patches decreasing in size posteriorly and fusing to longitudinal row of patches; lateral opisthosoma with irregular pattern of partly elongate spots; ventral opisthosoma bright, without pattern.

Female: Unknown.

Distribution. Known only from the type locality (Figs 27: 2, 29).