Ypsiloncyphon panayensis, Yoshitomi, Hiroyuki, 2015

Yoshitomi, Hiroyuki, 2015, New species of the genus Ypsiloncyphon (Insecta: Coleoptera: Scirtidae: Scirtinae), Zootaxa 3904 (4), pp. 451-500 : 469-471

Ypsiloncyphon panayensis sp. n.

( Figs. 13 C, 16)

Type material. Holotype ( NMW): male, “PHILIPP.: Panay Isl. Libertad Fluß 21. 1. 1994 leg. Seyfert (10)”, genit. s. no. HY 975. Paratype ( NMW): 1 ex., same data as for the holotype.

Description. Male. Body ( Fig. 13 C) oval, strongly convex dorsally, shiny, closely covered with silver setae. Coloration of body brown, but mouthparts, antennae and legs yellowish brown.

Head moderate in size, slightly convex dorsally, finely punctate; clypeus short, front margin shallowly concave. Eyes large, prominent; the distance between eyes about 2.0 times as long as the maximum diameter of an eye. Antennae short, reaching to basal margin of elytra. Pronotum punctate as on head, strongly depressed in lateral parts; anterior margin straight; antero- and postero-lateral corners obtuse; lateral and posterior margins gently arcuate; PW/PL 2.32–2.52 (2.42). Scutellar shield punctate as on head, equilaterally triangular. Elytra oval, punctate as in head, widest at the middle, gently arcuate in lateral margins; humeral parts weakly projecting; apices right-angled; EL/EW 1.28–1.31 (1.29); EL/PL 4.80–4.88 (4.84); EW/PW 1.48–1.62 (1.55); TL/EW 1.54–1.58 (1.56). Legs slender, moderate in length.

Caudal margin of sternite VII ( Fig. 16 A) arcuate. Tergite VIII ( Fig. 16 B) lightly sclerotized, trapezoidal, bearing short setae and spines along posterior margin, with a pair of long and slender apodemes; tergite IX ( Fig. 16 C) lightly sclerotized in lateral parts, almost membranous in mesal part; sternite VIII ( Fig. 16 D) moderately sclerotized, T-shaped; sternite IX ( Fig. 16 E) moderately sclerotized, long, U-shaped, covered with transverse keels in apical 2/5, pointed at apices. Tegmen ( Fig. 16 F) moderately sclerotized, Y-shaped; parameres bifid in apical 2/5, bearing short spines in apical part, pointed at apices; basal part slender, subparallel-sided. Penis ( Fig. 16 G) short, moderately sclerotized, about 0.6 times as long as tegmen; pala relatively long, expanded in basal part; parameroids relatively short, gently tapered posteriorly, obtuse at apex, densely punctate; trigonium short, protruding from apical 1/3 to near apex.

Female. Unknown.

Measurements. Male (n = 2): TL 1.45 & 1.47 mm; PW 0.58 & 0.63 mm; PL 0.25 mm; EW 0.93 & 0.94 mm; EL 1.20 & 1.22 mm.

Distribution. Philippines (Panay Isl.).

Remarks. This species is closely related to Ypsiloncyphon guamensis sp. n. and Y. philippinensis sp. n., but differs from them in the following characteristics: 1) apodemes of tergite VIII longer (shorter in Y. philippinensis sp. n.), and 2) sternite IX longer, with keels in apical 2/5 (relatively short, without keels in Y. philippinensis sp. n.; relatively long, with keels in apical 3/ 5 in Y. guamensis sp. n.).

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