Psechrus luangprabang, Jäger, Peter, 2007

Jäger, Peter, 2007, Spiders from Laos with descriptions of new species (Arachnida: Araneae), Acta Arachnologica 56 (1), pp. 29-58: 45-47

publication ID 10.2476/asjaa.56.29


persistent identifier

treatment provided by


scientific name

Psechrus luangprabang

spec. nov.

Psechrus luangprabang  spec. nov.

Figs. 48-53View Figs. 48 - 53, 68-72View Figs. 64 - 71.View Fig. 72

Type material. Male holotype ( SMF 56389), Laos, Luang Prabang Prov., SE Luang Prabang, Nam Khan, Ban Keng Koung (L15), 372 m altitude, N 19°40.963', E 102° 18.442', along stream, disturbed forest, cultivated land, between rocks, at night, by hand , P. Jäger & J. Altmann leg. 7.III.2006GoogleMaps  . 1 male paratype, 1 female paratype ( SMF 56390), same data as holotypeGoogleMaps  . 1 female paratype ( SMF 56392), same data as holotypeGoogleMaps  . 1 male paratype ( SMF 56391), same data as holotype, but 8.III.2006GoogleMaps  .

Further material examined. 1 female ( SMF 56394), Laos, Luang Prabang Prov., S Luang Prabang, Ban Ean, That Se (L13), 304 m altitude, N 19°50.562', E 102°13. 118', waterfall, along stream, secondary forest, in rock crevice, at night, by hand , P. Jäger & J. Altmann leg. 5.III.2006  . 1 subadult male ( SMF 56393), same data as holotypeGoogleMaps  .

Etymology. The species is named after Luang Prabang Province, noun in apposition.

Diagnosis. Males ( Figs. 48View Figs. 48 - 53 ~51, 68~72View Figs. 64 - 71.) similar to those of P. himalayanus Simon 1906 in  position of embolus and conductor as well as course of sperm duct and presence of short, pointed macrosetae on coxae I, but embolus in the new species longer and distinctly bent (slightly s-shaped; Fig. 49View Figs. 48 - 53), and with additional ridge at its base. Dorsal cymbial scopula covering only the distal third ( Fig. 50View Figs. 48 - 53; distal half in P. himalayanus  ). Females similar to those of P. marsyandi Levi 1982  and P. ghecuanus Thorell 1897 in  shape of internal duct system, but distinguished from those species by having spermathecae closer to each other ( Fig. 53View Figs. 48 - 53) and epigynal furrows diverging anteriorly ( Fig. 52View Figs. 48 - 53; parallel in P. marsyandi  and P. ghecuanus  ).

Description. Male (n = 3). PL 5.3-6.0, PW 4.0-4.8, AW 2.0-2.5, OL 7.0-9.0, OW 2.8-3.8. Leg II: 35.5-39.7 (9.6- 10.9, 2.2-2.6, 9.6-10.7, 9.5-10.7, 4.6-4.8). Coxae I with 25-43 short, pointed macrosetae retrolatero-ventrally, 0~5 macrosetae also present at the distal margin of trochanter ( Fig. 51View Figs. 48 - 53); such macrosetae absent in subadult male. Sperm duct running 1.5 windings before entering embolus; conductor sheath-like; embolus arising from about the centre of the tegulum, running in a distinct bend retrolaterally, then straight distally and ending with a slight bend retrolaterodistad ( Fig. 49View Figs. 48 - 53).

Female (n=2). PL 7.9-8.2, PW 5.8-5.9, AW 3.5-3.6, OL 10.5-11.1, OW 4.5-4.8. Leg II: 38.6-40.0 (10.7-11.2, 3.1-3.3, 10.6-11.1, 9.6-9.8, 4.6). Coxae I without short, pointed macrosetae. Epigynal field appearing as rounded trapezoid; muscle sigillae anterior to epigynal field kidneyshaped, separated from the field about 1.5 their length; two pairs of slit sense organs close to sigillae; epigynal furrows building a trapezoid, ending as semi circles at their anterior end; posterior margin of median septum with slight median protuberance ( Fig. 52View Figs. 48 - 53); internal duct system with spherical spermathecae, the latter with glandular appendages in an antero-median position ( Fig. 53View Figs. 48 - 53).

Colour (in ethanol). ( Figs. 68-71View Figs. 64 - 71.) Dorsal shield of prosoma with dark median band, this with bright median patches and serrated lateral margins. Sternum with broad lateral bright bands in its posterior half, dark triangle almost not touching posterior margin. Dorsal opisthosoma dark with bright heart patch and darker transversal markings in its posterior half. Ventral opisthosoma dark, with white median line interrupted in front of spinnerets. Legs annulated and with distinct dark spine patches. Colour pattern of living specimens see Fig. 72View Fig. 72.

Distribution. Known so far only from Luang Prabang Province from two places SE of Luang Prabang: Ban Keng Koung ( L 15) and That Se waterfall ( L 13).


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