New species of the genus Ypsiloncyphon (Insecta: Coleoptera: Scirtidae: Scirtinae) Author Yoshitomi, Hiroyuki text Zootaxa 2015 3904 4 451 500 journal article 10.11646/zootaxa.3904.4.1 a1c49726-9afa-4be5-85ef-9d0caabac1fe 1175-5326 239899 38457A27-A15B-4E87-BE72-9A3AB007CAA5 Ypsiloncyphon bicornutus sp. n. ( Figs. 1 E, 6) Type material. Holotype ( EUMJ ): male, “Gn. Alab., Tambunan, Sabah, BORNEO 7. II. 2008 H. Takizawa leg.”, “genitalia in slide No. HY 1116”. Description. Male. Body ( Fig. 1 E) oblong, convex dorsally, shiny, closely covered with silver setae. Coloration of body reddish-brown, but antennomeres V–XI and meso- and meta-thoraces dark brown. Head relatively large, slightly convex dorsally, finely punctate; clypeus narrow and long, shallowly concave in front margin. Eyes large, prominent; the distance between eyes about 1.9 times as long as the maximum diameter of an eye. Antennae relatively short, reaching about proximal 1/4 of elytra. Pronotum punctate as on head, strongly depressed in lateral parts; antero-lateral corners obtuse; anterior margin bisinuous; lateral and posterior margins gently arcuate; postero-lateral corners rather pointed; PW/PL 1.88. Scutellar shield equilaterally triangular. Elytra oblong, subparallel-sided near base to apical 1/4, densely punctate; humeral parts weakly projecting; apices rightangled; EL/EW 1.63; EL/PL 4.50; EW/PW 1.47; TL/EW 2.00. Legs relatively large and slender. FIGURE 6 . Ypsiloncyphon bicornutus sp. n. , holotype, male. A) sternites V–VII, B) tergite VIII, C) tergite IX, D) sternite IX, E) tegmen, F) penis in ventral view. Caudal margin of sternite VII ( Fig. 6 A) arcuate. Tergite VIII ( Fig. 6 B) moderately sclerotized, wide, upturned in posterior margin bearing short setae, with a pair of short and slender apodemes. Tergite IX ( Fig. 6 C) slightly sclerotized, trapezoidal, bearing short spines along posterior margin, with a pair of long and stout apodemes. Sternite IX ( Fig. 6 D) short, moderately sclerotized, Y-shaped. Tegmen ( Fig. 6 E) well sclerotized, U-shaped; parameres subparallel-sided, long, pointed at apices. Penis ( Fig. 6 F) long, about 1.3 times as long as tegmen, moderately sclerotized; pala with open basal margin; parameroids long, wide, separated, sparsely punctate; trigonium short and wide, projecting from basal 1/2, bifurcate at apex. Female. Unknown. Measurements. Male (n = 1): TL 2.20 mm ; PW 0.75 mm ; PL 0.40 mm ; EL 1.80 mm ; EW 1.10 mm . Distribution. Malaysia (Borneo). Remarks. This species is closely related to Ypsiloncyphon bifurcatus sp. n. , but is distinguished from it by the characteristics mentioned in the remarks for Y . bifurcatus sp. n. The character state of the separated parameroids this species are also present in other species (e.g., Y . micans , Y. minutulus , Y. mendosus , Y. disparatus , Y. remotus , and Y . yayeyamanus ). These species probably evolved independently, because they belong to different species groups. Etymology. The species name refers to the bicornated trigonium.