Sphedanus undatus Thorell 1877

Jäger, Peter, 2011, Revision of the spider genera Nilus O. Pickard-Cambridge 1876, Sphedanus Thorell 1877 and Dendrolycosa Doleschall 1859 (Araneae: Pisauridae), Zootaxa 3046, pp. 1-38 : 10

Sphedanus undatus Thorell 1877

Figs 19 : 10, 20–23

Sphedanus undatus Thorell 1877: 523 (Description of female; female holotype from Sulawesi, Kandari, O. Beccari leg. 1874, MCSN, examined).

Nilus undatus ,— Simon 1898a: 289.

Diagnosis. Epigyne similar to S. quadrimaculatus comb. nov. ( Figs 24–26 ) and S. banna comb. nov. ( Figs 27–29 ) but distinguished by the atria in dorsal view covering the copulatory ducts almost completely. It is more similar to S. banna comb. nov. in having short and posteriorly situated head of spermathecae, a long median ridge of epigynal field extending into posterior half and in exhibiting only short ridges in the lateral lobes. Median margins of lateral lobes undulating and diverging posteriorly as in S. quadrimaculata comb. nov.

Redescription. PL 3.1, PW 2.6, AW 1.5, OL 4.6, OW 2.2. AME 0.21, ALE 0.21, PME 0.19, PLE 0.21, Chelicerae with 3 anterior and 3 posterior teeth, furrow without denticles. Leg I measurements: 14.4 (4.0, 1.4, 4.0, 3.3, 1.7).

Epigyne in general similar to S. banna comb. nov. and S. quadrimaculata comb. nov. but distinguished by traits listed in the diagnosis. Posterior part of median lobes similarly large as in S. banna comb. nov., but more prominent (outline) in posterior view ( Fig. 23 ).

Male. Unknown.

Distribution. Known only from the type locality.

Figures

FIGURES 16 – 19. 16 – 17 Nilus amazonicus Simon 1898, holotype, juvenile, from Brazil, habitus (16 dorsal view; 17 ventral view). 18 Records of Nilus spp. (1 Egypt, Alexandria; 2 Ethiopia, detailed locality unclear; 3 India, Andhra Pradesh; 4 Andaman Islands; asterisk denotes type species of the genus). 19 Records of Sphedanus spp. (1 China, Yunnan, Menglun; 2 Laos, Luang Nam Tha Province: Ban Tavan, Nam Ha Protected Area; 3 Laos, Luang Prabang Province: Ban Mout, Ban Kengkoung, Tad Se; 4 Laos, Vientiane Province: Vang Vieng; 5 Laos, Champasak Province: Tha Hou; 6 Thailand, Trat Province: Koh Chang; 7 Malaysia: Genting [from Murphy & Murphy 2000]; 8 Singapore; 9 Brunei; 10 Indonesia, Sulawesi: Kandari; asterisks denote type localities of particular species).

FIGURES 20 – 29. Sphedanus spp., female copulatory organs (20, 24, 27 epigyne, ventral view; 21, 25, 28 vulva, dorsal view; 22 schematic course of internal duct system; 23, 26, 29 epigyne, posterior view). 20 – 23 Sphedanus undatus Thorell 1877, holotype, female from Indonesia, Sulawesi. 24 – 26 Sphedanus quadrimaculatus (Thorell 1897), female syntype from Singapore. 27 – 29 Sphedanus banna (Zhang, Zhu & Song 2004), female from Laos.