Ypsiloncyphon philippinensis, Yoshitomi, Hiroyuki, 2015

Yoshitomi, Hiroyuki, 2015, New species of the genus Ypsiloncyphon (Insecta: Coleoptera: Scirtidae: Scirtinae), Zootaxa 3904 (4), pp. 451-500 : 468-469

Ypsiloncyphon philippinensis sp. n.

( Figs. 13 B, 15)

Type material. Holotype ( EUMJ): male, “ PHILIPPINES Mt. Polis, 1900m Ifugao Prov., Luzon June, 4, 5, 1977 M. Sato leg.”, genit. s. no. HY 803. Paratypes ( EUMJ): 2 Males, “ PHILIPPINES Kinakin, 1050m Ifugao Prov., Luzon June, 3, 1977 M. Sato leg.”

Description. Male. Body ( Fig. 13 B) oval, convex dorsally, shining, closely covered with yellowish-white setae throughout. Coloration of body blackish-brown; antennae, mouthparts, and legs yellowish-brown, except for infuscated femora.

Head moderate in size, dorsal surface almost flat, granulated, emarginate in front margin. Eyes moderate in size, prominent; the distance between eyes about 2.0 times as long as the maximum diameter of an eye. Antennae relatively short. Pronotum granulated as on head; front margin almost straight in dorsal aspect; lateral margin gently arcuate; antero- and postero-lateral corners obtuse; PW/PL 2.34. Scutellar shield subtriangular, finely punctate. Elytra oval, widest at the middle, finely and densely punctate; apices rectangular; EL/EW 1.25; EL/PL 4.69; EW/PW 1.60; TL/EW 1.52.

Caudal margin of sternite VII ( Fig. 15 A) arcuate. Tergite VIII ( Fig. 15 B) lightly sclerotized, trapezoidal, bearing short setae and spines along posterior margin, with a pair of long and slender apodemes protruding from near antero-lateral corners; sternite VIII ( Fig. 15 C) well sclerotized, Y-shaped, relatively long; tergite IX ( Fig. 15 D) lightly sclerotized in lateral part, consisting of a pair of hemitergites; sternite IX ( Fig. 15 E) well sclerotized, Ushaped, slender, pointed at apices, bearing minute serrations in apical 1/5. Tegmen ( Fig. 15 F) long, well sclerotized, Y-shaped, bifid in apical 1/3; proximal part slightly expanded antero-laterally, anterior margin concave; parameres covered with short spines in apical part, pointed at apex. Penis ( Fig. 15 G, H) well sclerotized, shorter than tegmen; parameroids obtuse at apex, finely punctate, strongly expanded laterally in proximal 1/3; pala short, subparallelsided, arcuate in basal margin; trigonium gently curved ventrally, somewhat pointed at apex.

Female. Unknown.

Measurements. Male (n = 1): TL 1.82 mm; PW 0.75 mm; PL 0.32 mm; EW 1.20 mm; EL 1.50 mm.

Distribution. Philippines (Luzon Isl.).

Remarks. This species is related to Ypsiloncyphon guamensis sp. n. and Y. panayensis sp. n. in the shapes of tergite XI, tegmen and penis. It differs from them by lacking keels in the apical part of sternite IX.

Etymology. The species is named after the type locality.

Figures

FIGURE 13. Habitus of Ypsiloncyphon spp., holotype, male (except for F). A) Y. guamensis sp. n., B) Y. philippinensis sp. n., C) Y. panayensis sp. n., D) Y. chlorizanoides sp. n., E) Y. bicolor sp. n., F) Y. bicolor sp. n., paratype, female, G) Y. sumatranus sp. n., H) Y. acer sp. n., I) Y. nokrekensis sp. n., J) Y. boukali sp. n., K) Y. javanicus sp. n., L) Y. nepalensis sp. n. Scales: 1.0 mm.

FIGURE 15. Ypsiloncyphon philippinensis sp. n., holotype, male. A) sternites V – VII, B) tergite VIII, C) sternite VIII, D) tergite IX, E) sternite IX, F) tegmen, G) penis in ventral view, H) penis in lateral view.