New Trilacuna species from Thailand, Malaysia and Sumatra (Araneae, Oonopidae) Author Eichenberger, Beata Author Kranz-Baltensperger, Yvonne text Zootaxa 2011 2011-04-18 2823 1 31 journal article 10.5281/zenodo.277240 907ae2b6-4805-4348-96af-640f649d491d 1175-5326 277240 Trilacuna bilingua Eichenberger n. sp. ( Figs. 5–6 ) Type material : Holotype male (PBI_OON 00015933): West Malaysia : Pahang State : Cameron Highlands , Gunung Jasar , trail 11, 1550 m, tamisage, 24 March 1993 , leg. I. Löbl & F. Calame , deposited in MHNG . Etymology : The species epithet is a noun in apposition, composed of the Latin words bi (two) and lingua (tongue), and refers to the two tongue-like lobes baso-ventrally on the male palpal conductor. Diagnosis : Trilacuna bilingua resembles T. merapi but can be easily distinguished by the two small conspicuous basal lobes (lo) ventrally on the palpal conductor (figs. 6 . D–E) and by the lateral carapace margin with blunt denticles, and a second, strongly rebordered, undulated margin below (figs. 5 . E–G). Description : Description based on 1 male . MALE ( holotype ): Body length 2.1 mm , proportion carapace length:abdominal length 1 : 1 . Uniformly dark red-brown species (figs. 5 . A–C). Carapace ovoid, slightly elevated, surface smooth, with one tiny dorsal spike (sp), (fig. 5 . C). Eyes posterior row recurved from above, straight from front (fig. 5 . G). Sternum with radial furrows of large pits between coxae, medial surface coarsely reticulate (fig. 5 . D), anterior margin with transverse groove; setae sparse, light, needlelike, evenly scattered. Mouthparts : Labium rectangular, not fused to sternum, anterior margin deeply incised (ldi), (figs. 5 . H–I); endites slender, distally not branched, distal-outer part excavated (dex), (figs. 5 . H–I). Abdomen : Ovoid, dorsal scutum not fused to epigastric scutum, postepigastric scutum long, semicircular, with short, posteriorly directed lateral apodemes, posterior spiracles not connected by groove but connection indicated by dark belt. FIGURE 5 : Trilacuna bilingua n. sp. Male: A. habitus dorsal view; B. habitus ventral view; C. habitus lateral view; D. sternum ventral view; E. carapace dorsal view; F. carapace dorsal view, lateral margin; G. carapace anterior view; H–I. endites ventral view. Abbreviations: sp, spike; boc, booklung covers; ldi, labium deep incision; dex, distal excavation. Scale bars: A–C 1 mm; D–E, G 0.5 mm; F 100 Μm; H–I 200 Μm. FIGURE 6 : Trilacuna bilingua n. sp. Male: A. gonopore, ventral view; B–C. left palp, prolateral view; D–E. left embolus-conductor-complex, prolateral view; F. left embolus-conductor-complex, dorsal view. Abbreviations: dd, dark dot; emb, embolus; dh, dorsal hairs; vc, ventral conductor; lo, lobe. Scale bars: A–C 300 Μm; D, F 50 Μm; E 100 Μm. Legs : Ventral apex of tibiae III and IV with some specialized hairs with fine, plumose, curved hair tip (see fig. 16 . H), metatarsi III, IV and tarsus IV with harpoon-like hairs (see fig. 2 . G). Femora without spines. Male genitalia : Epigastric region with small dark dot (dd) posterior of sperm pore at level of posterior spiracles (fig. 6 . A). Male palp (figs. 6 . B–F): Embolus (em) light, long and straight, framed by some dorsal hairs (dh) (figs. 6 . D–F); ventral conductor (vc) shorter than embolus, composed of a single branch enclosed by sparse, distally dense hairs (figs. 6 . D–F). Bulb nearly as long as cymbium, stout, tapering apically (figs. 6 . B–C). Femur elongated, slender (figs. 6 . B–C). FEMALE: unknown. Remark : The patella of leg IV of the holotype carries a presumed parasite. Distribution : Known only from the type locality in West-Malaysia, the Gunung Jasar in the Cameron Highlands.