Ypsiloncyphon borneensis, Yoshitomi, Hiroyuki, 2015

Yoshitomi, Hiroyuki, 2015, New species of the genus Ypsiloncyphon (Insecta: Coleoptera: Scirtidae: Scirtinae), Zootaxa 3904 (4), pp. 451-500 : 459-461

Ypsiloncyphon borneensis sp. n.

( Figs. 1 F, 7, 8)

Type material. Holotype ( ITBC): male, “Gn. Alab, Tambunan Sabah, BORNEO 7. II. 2008 H. Takizawa”. Paratypes: 5 males & 2 females ( ITBC, EUMJ, SEHU), same data as for the holotype, one male gent. s. no. HY 1105; 4 males ( ITBC, EUMJ, SEHU), same locality and collector, but 18. VIII. 2007; 1 male, same locality and collector, but 14. X. 2007; 1 male & 1 female, same locality and collector, but 8. XII. 2007; 1 male, same locality and collector, but 15-16. I. 2008; 1 male & 1 female, same locality and collector, but 25. V. 2008, female genit. s. no. HY 1112; 5 males ( ITBC, EUMJ, SEHU), same locality and collector, but 16. XI. 2008; 1 male ( ITBC), “Gn. Alab, Crocker Range Park, Penampang, Sabah, Borneo 31. VII. 2008 H. Takizawa leg.”; 1 male ( ITBC), “Hydro Power Stat., Bario, Kelambit highland, Sarawak 5. IX. 2007 H. Takizawa leg.”, genit. s. no. HY 1106; 1 male ( ITBC), “Kundasang, Ranau, Sabah, BORNEO Malaysia 29. VII. 2008 H. Takizawa leg.”; 1 male ( EUMJ), “[ MALAYSIA] Headquarters (alt. 1500–1700m) Mt. Kinabalu Sabah III -27. 1976 S. NAGAI leg.”; 1 male, same locality, but “ 4. V. 1980 M. & A. Sakai”; 1 male ( EUMJ), same locality, but” 3. V. 1980 M. & A. Sakai”; 1 male ( EUMJ), same locality, but “ 22. III. 1989 K. Matsumoto leg.”; 1 male ( EUMJ), same locality, but “ 2–4. V. 2010, H.

Yoshitomi leg.”; 1 male, “ Malaysia - Sabah GUNUNG EMAS-Crocker Mt. 15-27. IV. 1993 M. Strba, I. Jenie leg.”; 1 male ( SMNH), “BORNEO:Sabah, Crocker Range N.P., Gunung Emas 6.-18. VI. 1996 1500–1700 m leg. J. KODADA”; 1 male ( NMW), “BORNEO Sabah Batu Punggul”, “ 25km SE Sapulut 23. V. 2001 ”, genit. s. no. HY 962; 1 female ( ITBC), “ Malaysia SABAH Gn. Alab. Crocker R. Park. Tambunan 27. XI. 2009 H. Takizawa”.

Description. Male. Body ( Fig. 1 F) oval, convex dorsally, strongly shiny, closely covered with translucent brown setae. Coloration of body black, but mouthparts, antennomeres I–II, trochanters and proximal parts of tibiae pale brown.

Head moderate in size, slightly convex dorsally, finely punctate, with straight front margin of clypeus. Eyes moderate in size, prominent; the distance between eyes about 2.1 times as long as the maximum diameter of an eye. Antennae relatively short, reaching about proximal 1/3 of elytra. Pronotum punctate as on head, rather strongly depressed dorsally in lateral parts; anterior margin almost straight; lateral and posterior margins gently arcuate; antero-lateral corners obtuse, slightly projecting anteriorly; postero-lateral corners obtuse; PW/PL 2.00–2.25 (2.10). Scutellar shield moderate in size, punctate as in pronotum, equilaterally triangular. Elytra oval, widest at the middle, gently arcuate in lateral margins, densely punctate, provided with three pairs of weak costae; humeral parts weakly projecting dorsally; apices right-angled; EL/EW 1.38–1.46 (1.41); EL/PL 4.22–4.75 (4.56); EW/PW 1.50–1.57 (1.53); TL/EW 1.69–1.77 (1.72).

Tergite VII transverse, with a pair of short apodemes. Sternites III–VII closely covered with short setae; caudal margin of sternite VII ( Fig. 7 A) arcuate. Tergite VIII ( Fig. 7 B) moderately sclerotized, deeply concave in mesal part of caudal margin, bearing short setae along caudal margin, with a pair of slender apodemes; tergite IX ( Fig. 7 C) membranous, sparsely covered with short spines in mesal part, with a pair of long and slender apodemes sclerotized lightly. Tegmen ( Fig. 7 D) short, well sclerotized, Y-shaped. Penis ( Fig. 7 E) relatively short, about 2.2 times as long as tegmen; pala oblong, subparallel-sided; parameroids broad, sparsely punctate, gently expanded apically, rounded at apex; trigonium short and broad, protruding from basal 2/3 to 10/11, expanded and serrate in apical part.

Female. Sexual dimorphism distinct: coloration of elytra brown; PW/PL 2.00–2.33 (2.17); EL/EW 1.49–1.58 (1.54); EL/PL 4.44–5.20 (4.85); EW/PW 1.38–1.51 (1.45); TL/EW 1.77–1.90 (1.86). Caudal margin of sternite VII ( Fig. 8 A) gently arcuate. Tergite VIII ( Fig. 8 B) well sclerotized, subquadrate, concave and bearing short setae in caudal margin, sparsely punctate, with a pair of long and slender apodemes protruding from antero-lateral corners. Sternite VIII ( Fig. 8 C) well sclerotized, quadrate, bearing short spines along caudal margin and minute spines in mesal part, with a long median apodeme. Ovipositor ( Fig. 8 D, E) well sclerotized; stylus very small, projecting from postero-ventral parts of coxite; coxite ( Fig. 8 E) well sclerotized, subtriangular, finely punctate; baculus relatively short, without branch; approximate ratio of stylus, coxite and baculus (n = 1) as 1.0: 7.5: 56.0; prehensor indistinct.

Measurements. Male (n = 3): TL 2.28–2.35 (2.31) mm; PW 0.83–0.90 (0.88) mm; PL 0.40–0.45 (0.42) mm; EW 1.30–1.38 (1.34) mm; EL 1.88–1.90 (1.89) mm. Female (n = 4): TL 2.03–2.48 (2.34) mm; PW 0.78–0.93 (0.87) mm; PL 0.35–0.45 (0.40) mm; EL 1.68–2.08 (1.94) mm; EW 1.08–1.40 (1.26) mm.

Distribution. Malaysia (Borneo).

Remarks. This is a remarkable species in having the following characteristics: 1) tergite VIII deeply concave in apical margin, 2) tegmen short, and 3) penis with gently expanded parameroids.

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

FIGURE 8. Ypsiloncyphon borneensis sp. n., paratype, female. A) sternites V – VII, B) tergite VIII, C) sternite VIII, D) ovipositor, E) close up of apex of ovipositor.