Sesieutes thakek, Jäger, Peter, 2007

Jäger, Peter, 2007, Spiders from Laos with descriptions of new species (Arachnida: Araneae), Acta Arachnologica 56 (1), pp. 29-58: 48-49

publication ID

http://doi.org/ 10.2476/asjaa.56.29

persistent identifier

http://treatment.plazi.org/id/D27487BF-FF91-3B10-FF76-3EAD7D93F79D

treatment provided by

Jeremy

scientific name

Sesieutes thakek
status

spec. nov.

Sesieutes thakek   spec. nov.

Figs. 73-82 View Figs. 73 - 82

Type material. Male holotype ( SMF 56635), Laos, Khammouan Prov., 9.5 km NE Thakek   (L34), 159 m altitude, N 17°26.936', E 104°52.499', leaf litter in front of cave, by sieving, P. Jäger & V. Vedel leg. 30.X.2004 GoogleMaps   .

Etymology. The species is named after the province capital Thakek   (= Muang Khammouan), closely situated to the type locality, noun in apposition.

Diagnosis. Medium sized Sesieutes   species (5.2 mm body length). Male similar to that of S. schwendingeri Deeleman-Reinhold 2001   (figs. 771-772) according to general arrangement of copulatory organ and colouration, but having base of embolus broader and bent dorsad ( Fig. 73 View Figs. 73 - 82 ; narrower and bent basad in S. schwendingeri   ), tegulum distinctly pear-shaped ( Fig. 74 View Figs. 73 - 82 ; not that wide basally in S. schwendingeri   ), and ventral prosomal granulations restricted to the central part of the sternum ( Fig. 80 View Figs. 73 - 82 ; dense granulation in sternum, labium and gnathocoxae in S. schwendingeri   ).

Description. Male. PL 2.6, PW 1.9, AW 1.05, OL 2.6, OW 1.5. Leg II: 8.95 (2.45, 0.85, 2.4, 2.05, 1.2). Spination: femur I 2 pl; tibia I 9 pv, 9 rv, II 8 pv, 7rv, III 1 pv, 1 rv, 1 rl, IV 3 pv, 2 rv, 1 rl; metatarsus I 5 pv, 6 rv, II 5 pv, 5 rv, III 1 pl, 1 pv, 1 rv, 1 rl, IV 2 rv, 1 rl; Femoral spines with small basal tooth and with large, toothed socket ( Figs. 81- 82 View Figs. 73 - 82 ). Leg claws with 4- 5 teeth. Dorsal scutum 0.5 OS length. Chelicerae with three promarginal and 2 small retromarginal teeth ( Fig. 80 View Figs. 73 - 82 ).

Embolus arising in 10-o’clock-position, running first distad, then dorsad ( Fig. 73 View Figs. 73 - 82 ), finally ending in a distal coil, with its plane transverse to that of the alveolus; tip of embolus running semi-circular, becoming narrower distally ( Fig. 77 View Figs. 73 - 82 ). Functional conductor short, slightly bent, arising in a 11-o’clock-position ( Fig. 74 View Figs. 73 - 82 ). Tip of embolus resting in conductor in unexpanded pedipalpus ( Fig. 77 View Figs. 73 - 82 ). Subtegulum visible in prolateral view ( Fig. 73 View Figs. 73 - 82 ). Sperm-duct on retrolateral side ( Fig. 75 View Figs. 73 - 82 ) in similar position as in S. schwendingeri   . Pedipalpal tibia with retrolateral blunt distal hump and retrolateral basal apophysis, the latter with distinct ridge ( Fig. 76 View Figs. 73 - 82 ). Cymbial scopula similar as in S. schwendingeri   , i.e. extending in the distal third to quarter of dorsal cymbium ( Fig. 75 View Figs. 73 - 82 ). Ventral scutum of OS with small bent rim in front of genital opening ( Fig. 78 View Figs. 73 - 82 ).

Colour and granulation (in ethanol). Dorsal shield of PS dark reddish brown, with dense and distinct granulations, fovea small, circular, striae less distinct. Sternum brighter reddish brown, with slight radial striae and granulations in the centre, these fading marginally ( Fig. 80 View Figs. 73 - 82 ). Labium and gnathocoxae bright redbrown, with striae and very sparse and small granulations; legs and ventral scutum of OS yellowish brown, with fine granulations, on distal segments less distinct, femora darker. Petiolus anteriorly with ventral median keel. Dorsal OS dark grey with reddish brown scutum, behind that with two white lateral patches, behind those with 4 slightly recurved white chevrons and white patch in front of spinnerets. Ventral OS generally brighter than dorsal side, with lateral rows of small bright patches. Spinnerets with apical segment white, basal segments grey. Female, unknown.

Distribution. Known only from the type locality

SMF

Germany, Frankfurt-am-Main, Forschungsinstitut und Naturmuseum Senckenberg

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Liocranidae

Genus

Sesieutes