Ypsiloncyphon myanmarnus, Yoshitomi, Hiroyuki, 2015

Yoshitomi, Hiroyuki, 2015, New species of the genus Ypsiloncyphon (Insecta: Coleoptera: Scirtidae: Scirtinae), Zootaxa 3904 (4), pp. 451-500 : 455-456

Ypsiloncyphon myanmarnus sp. n.

( Figs. 1 B, 3)

Type material. Holotype ( NMW): male, “ MYANMAR: Sagaing Division Chatthin Wildlife Sanctuary 23º31.324’N 95º38.417’E ca. 210m, 9. 10. 1998 leg. Schillhammer (11)”, genit. s. no. HY 883.

Description. Male. Body ( Fig. 1 B) oblong-oval, slightly convex dorsally, shining, closely covered with yellowish-white setae. Coloration of body brown, but antennae and legs pale brown.

Head large, slightly convex dorsally, minutely granulate. Eyes large, weakly prominent; the distance between eyes about 2.5 times as long as the maximum diameter of an eye. Pronotum granulate as on head; front and lateral margins straight; antero- and postero-lateral corners about 120º, slightly projecting anteriorly in anterior corners; posterior margin bisinuous; PW/PL 2.11. Scutellar shield small, equilaterally triangular, densely punctate. Elytra oblong, widest at the middle, densely punctate; each elytron furnished with three indistinct costae; humeral parts lightly projecting; apices right-angled; EL/EW 1.60; EL/PL 4.21; EW/PW 1.25; TL/EW 1.98.

Caudal margin of sternite VII ( Fig. 3 A) gently arcuate. Tergite VIII ( Fig. 3 B) well sclerotized, trapezoidal, with long apodemes; two pairs of projections protruding from basal part, outer one pointed at apices, inner one longer, obtuse at apices. Tergite IX ( Fig. 3 C) moderately sclerotized, H-shaped; apices pointed, with large clawlike projections. Tegmen ( Fig. 3 D) moderately sclerotized, long, Y-shaped; parameres long, apical 2/5 of length of tegmen, pointed at apices. Penis ( Fig. 3 E) moderately sclerotized, about 0.73 times as long as tegmen; pala arcuate in basal margin, widest just before the base; parameroid obtuse and widened at apex, densely punctate in apical part, with some nipple-like setae in apical 1/3 of dorsal surface; trigonium pointed at apex, gently curved ventrally.

Female. Unknown.

Measurements. Male (n = 1): TL 1.98 mm; PW 0.80 mm; PL 0.38 mm; EW 1.00 mm; EL 1.60 mm.

Distribution. Myanmar.

Remarks. This is a remarkable species in having the following characters: 1) tergite VIII with two pairs of long projections on lateral margin, 2) tergite IX pointed and with claw-like apical projections, and 3) trigonium of penis pointed at apex. Related species are unknown.

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 3. Ypsiloncyphon myanmarnus sp. n., holotype, male. A) sternites V – VII, B) tergite VIII, C) tergite IX, D) tegmen, E) penis in lateral view.