Ypsiloncyphon kedahensis, Yoshitomi, Hiroyuki, 2015

Yoshitomi, Hiroyuki, 2015, New species of the genus Ypsiloncyphon (Insecta: Coleoptera: Scirtidae: Scirtinae), Zootaxa 3904 (4), pp. 451-500 : 464

Ypsiloncyphon kedahensis sp. n.

( Figs. 1 I, 11)

Type material. Holotype ( NMW): male, “ MALAYSIA 30.1.1992, Kedah NW Langkawi Ö Datei leg. Jäch (15)”, genit. s. no. HY 902.

Description. Male. Body ( Fig. 1 I) oval, slightly convex dorsally, shining, closely covered with yellowishwhite setae. Coloration of head and pronotum brown, but mesal part of pronotum darker; mouthparts, antennae and legs pale brown; scutellar shield, elytra and ventral part of body blackish-brown.

Head large, slightly convex dorsally, minutely granulate, front margin of clypeus shallowly concave. Eyes large, prominent; the distance between eyes about 2.1 times as long as the maximum diameter of an eye. Pronotum granulate as on head, slightly depressed in lateral parts; front margin straight; antero- and postero-lateral corners obtuse; lateral margins gently arcuate; posterior margin bisinuous; PW/PL 2.57. Scutellar shield small, equilaterally triangular. Elytra oval, widest at the middle, finely punctate; humeral parts lightly projecting dorsolaterally; apices right-angled; EL/EW 1.21; EL/PL 4.57; EW/PW 1.47; TL/EW 1.48.

Caudal margin of sternite VII ( Fig. 11 A) arcuate. Tergite VIII ( Fig. 11 B) lightly sclerotized, postero-lateral corners projecting caudo-laterally, a pair of long and slender apodemes protruding from antero-lateral corners; a triangular projection projecting anteriorly from posterior margin, situated in center. Tergite IX ( Fig. 11 D) almost membranous, semicircular, with a pair of long and slender apodemes. Sternite VIII ( Fig. 11 C) lightly sclerotized, short, Y-shaped. Tegmen ( Fig. 11 E) long, well sclerotized, Y-shaped, bifid in apical 1/3, pointed at apices. Penis ( Fig. 11 F) long, well sclerotized, 1.5 times as long as tegmen; pala evenly tapered basally; parameroids plate-like, subparallel-sided, sparsely punctate, obtuse at apices; trigonium indistinct.

Female. Unknown.

Measurements. Male (n = 1): TL 1.95 mm; PW 0.90 mm; PL 0.35 mm; EW 1.32 mm; EL 1.60 mm.

Distribution. Malaysia (Peninsular).

Remarks. This species is related to Ypsiloncyphon garoensis sp. n. and Y. chiangmaiensis sp. n. in the penis with indistinct trigonium, but differs from them by the shapes of the tergite VIII, tegmen and penis.

Etymology. The species is named after the type locality.

Figures

FIGURE 1. Habitus of Ypsiloncyphon spp., holotype, male (except for K). A) Y. laosensis sp. n., B) Y. myanmarnus sp. n., C) Y. nomurai sp. n., D) Y. bifurcatus sp. n., E) Y. bicornutus sp. n., F) Y. borneensis sp. n., G) Y. brachytrigonium sp. n., H) Y. garoensis sp. n., I) Y. kedahensis sp. n., J) Y. prolongatus sp. n., K) Y. mendosus (Klausnitzer, 1980), non-type specimen, male. Scales: 1.0 mm.

FIGURE 11. Ypsiloncyphon kedahensis sp. n., holotype, male. A) sternites V – VII, B) tergite VIII, C) sternite VIII, D) tergite IX, E) tegmen, F) penis in ventral view.