Ypsiloncyphon flexus, Yoshitomi, Hiroyuki, 2015

Yoshitomi, Hiroyuki, 2015, New species of the genus Ypsiloncyphon (Insecta: Coleoptera: Scirtidae: Scirtinae), Zootaxa 3904 (4), pp. 451-500 : 491-492

Ypsiloncyphon flexus sp. n.

( Figs. 26 D, 33)

Type material. Holotype ( NHM): male, “ TRAY 95”, “Fog11 230 m 10. iii. 85 BMNH Plot A”, “ INDONESIA: SULAWESI UTARA, Pumoga-Bone N. P. March 1985.”, “R. Ent. Soc. Lond. PROJECT WALLACE B. M. 1985- 10”. Paratypes: 1 male ( NHM), “ TRAY 46”, “Fog13 230 m 11. vii. 85 BMNH Plot A”, “ INDONESIA: SULAWESI UTARA, Pumoga-Bone N. P. July 1985.”, “R. Ent. Soc. Lond. PROJECT WALLACE B. M. 1985- 10”; 1 male ( NHM), “ TRAY 56”, “Fog13 230 m 11. vii. 85 BMNH Plot A”, “ INDONESIA: SULAWESI UTARA, Pumoga-Bone N. P. July 1985.”, “R. Ent. Soc. Lond. PROJECT WALLACE B. M. 1985-10”; 1 male ( EUMJ), “ TRAY 45”, “Fog13 230 m 11. vii. 85 BMNH Plot A”, “ INDONESIA: SULAWESI UTARA, Pumoga-Bone N. P. July 1985.”, “R. Ent. Soc. Lond. PROJECT WALLACE B. M. 1985-10”.

Description. Male. Body ( Fig. 26 D) oval, strongly convex dorsally, shiny, closely covered with silver setae. Coloration of body brown; antennae, mouthparts and legs pale brown.

Head relatively large, flat dorsally, finely punctate, front margin of clypeus shallowly concave. Eyes large, prominent; the distance between eyes about 2.0 times as long as the maximum diameter of an eye. Antennae slender and long, reaching about proximal 1/2 of elytra. Pronotum densely punctate, strongly depressed in lateral parts; antero- and postero-lateral corners right-angled; anterior margin almost straight; lateral and posterior margins gently arcuate; PW/PL 2.00–2.29 (2.19). Scutellar shield finely punctate, equilaterally triangular. Elytra oval, widest at the middle, punctate as in pronotum; humeral parts slightly projecting; apices right-angled; EL/EW 1.23–1.29 (1.26); EL/PL 3.80–4.39 (4.14); EW/PW 1.49–1.50 (1.50); TL/EW 1.53–1.60 (1.57). Legs relatively long and slender.

Caudal margin of sternite VII ( Fig. 33 A) gently arcuate. Tergite VIII ( Fig. 33 B) moderately sclerotized, semicircular, bearing short spines and setae along caudal margin, with a pair of short slender apodemes. Sternite IX ( Fig. 33 C) very long, moderately sclerotized, elongate U-shaped, twisted in caudal parts. Tegmen ( Fig. 33 D) moderately sclerotized, Y-shaped; parameres slender, bearing short setae in lateral margins, pointed at apices. Penis ( Fig. 33 E) moderately sclerotized, about 1.2 times as long as tegmen; pala long, subparallel-sided; parameroids long, bilobed, slender; trigonium long, protruding from basal 2/5 to 4/5, curved ventrally in apical part.

Female. Unknown.

Measurements. Male (n = 3): TL 1.78–1.92 (1.84) mm; PW 0.75–0.80 (0.78) mm; PL 0.33–0.40 (0.36) mm; EL 1.45–1.52 (1.48) mm; EW 1.12–1.20 (1.17) mm.

Distribution. Indonesia (Sulawesi Isl.).

Remarks. This species is similar to Ypsiloncyphon Micans (Klausnitzer) in having a similarly shaped penis, but differs from the latter in the following characteristics: 1) sternite IX very long and twisted (long and almost straight in Micans ), and 2) tegmen bearing short setae (lacking setae in Micans ).

Etymology. The species name refers to the shape of the sternite IX.

Figures

FIGURE 26. Habitus of Ypsiloncyphon spp., holotype, male (except for C, F, H, I). A) Y. wallacei sp. n., B) Y. chiangmaiensis sp. n., C) Y. luteoapicalis (Ruta, 2007), non-type specimen, male, D) Y. flexus sp. n., E) Y. gedensis sp. n., F) Y. gedensis sp. n., paratype, female, G) Y. teruhisai sp. n., H) Y. teruhisai sp. n., paratype, female, I) Y. micans (Klausnitzer, 1973), non-type specimen, male, J) Y. lanigerus sp. n., K) Y. cervus sp. n. Scales: 1.0 mm.

FIGURE 33. Ypsiloncyphon flexus sp. n., holotype, male. A) sternites V – VII, B) tergite VIII, C) tergite IX, D) tegmen, E) penis in ventral view.