Scirtes micronesianus Yoshitomi

Yoshitomi, Hiroyuki, 2009, The Scirtes (Coleoptera: Scirtidae: Scirtinae) of Micronesia, Zootaxa 1974, pp. 1-16 : 2-5

Scirtes micronesianus Yoshitomi sp. n.

Figs. 1 A, 2A, 3

Type series. Holotype ( BPBM): male, “Neauo, Weno Is., Chuuk St., F. S. Micronesia 1995. I. 7, leg. A & R. Iwata”. Paratypes ( BPBM, BMNH, NMW, NSMT, EUM): 3 males & 10 females, same data as for the holotype, 1 female genitalia on slide no. HY 823; 1 male & 1 female, “Tunnuk→Wonip, Udot Is., Chuuk st., F. S. Micronesia 1995. I. 7. leg. A. & R. Iwata”; 1 male, “Sapeta, Fefan Is., Chuuk St., F. S. Micronesia 1995. I. 6 leg. R. Iwata”, genitalia on slide no. HY 937; 1 female, “Worowo, Rull Yap Is. MICRONESIA July 7, 1974 Y. Tomida leg.”; 1 female, “Tomil, Yap Is., MICRONESIA July 8, 1974 Y. Tomida leg.”; 7 males, “Moen Is. II- 27-67 ”, “guava”, “W. C. Mitchell Collector”; 2 males, “YAP: Dinay 21. XI. 1975 M. Lundgren Collector”, genitalia on. slide no. HY 950; 1 female, “YAP: Dinay 4. VI. 1976 ”, “M. Lundgren Collector”; 1 male, “Yap I., Yap. Hill Behind Yaptown Dec. 3. 1952 50m ”, “J. L. Gressitt Light trap”; 1 male, “YAP: Dinay 8. VII. 1976 Black light”, “M. Lundgren Collector”; 1 male, “MARIANA IS.: Guam, Barrigada X-’57, N. Krauss”; 1 male, “ Guam hocugilao”, “ 20-X-71 LA plante”, “Lot A6 Light”, “A. A. LaPlante Collection BISHOP Museum Acc. #1977.84”, genitalia on slide no. HY 951; 1 female, ditto, but “ 15-X-71 ”; 1 male, ditto, but “ 29-VII-1971 ”.

Description. Male. Body oval, slightly convex above, shining, closely covered with yellowish-white short setae throughout. Color of body mostly brown, but mouth parts, antennae and legs paler.

Head moderate in size, slightly convex dorsally, strongly punctate; clypeus long, expanded antero-laterally, anterior margin shallowly concave. Eyes moderate in size, prominent; the distance between eyes 1.7 times the maximum diameter of an eye. Antennae ( Fig. 2 A) slender, short, reaching about proximal 1/6 of elytra; approximate ratio of each antennal segment (n = 1) as 1.7: 1.6: 1.0: 1.7: 1.6: 1.7: 1.6: 1.6: 1.4: 1.5: 1.8. Pronotum slightly convex above, punctate as head; antero-lateral corners rectangular, projecting anteriorly; front and lateral margins gently arcuate; postero-lateral corners about 120º; posterior margin gently bisinuate; PW/PL 2.33–2.86 (2.59). Scutellum moderate in size, an equilateral-triangule, punctate as head. Elytra oval, widest at the middle, punctate as pronotum; shoulders slightly elevated; EL/EW 1.31–1.53 (1.39); EL/PL 4.25–5.50 (4.86); EW/PW 1.22–1.47 (1.35); TL/EW 1.55–1.85 (1.68). Hind coxal plates subquadrate, distinctly projecting along postero-lateral corners, posterior margins concave. Legs relatively long. Hind tibial spurs relatively short, curved outward at apices, closely covered with minute setae; dorsal spurs about 2.3X length of ventral spurs, about 0.8X length of hind tarsal segment I.

Caudal margin of sternite VII ( Fig. 3 A) concave. Tergite VIII ( Fig. 3 B) moderately sclerotized, trapezoidal, bearing short spines along apical margin; tergite IX ( Fig. 3 C) lightly sclerotized, with long apodemes. Tegmen ( Fig. 3 D) large, moderately sclerotized, front margin concave; parameres obtuse at apices, closely punctate, lateral margin projecting triangularly. Penis ( Fig. 3 E) moderately sclerotized, about 1.1X length of tegmen; pala oblong, arcuate in basal margin; parameroids short, almost straight, rather pointed apically; trigonium simply projecting, shorter than parameroids.

Female. Sexual dimorphism indistinct. Approximate ratio of each antennal segment (n = 1) as 1.8: 1.0: 1.1: 1.5: 1.5: 1.4: 1.5: 1.3: 1.3: 1.3: 1.4. PW/PL 2.34–2.76 (2.62); EL/EW 1.35–1.40 (1.38); EL/PL 4.76–5.36 (5.14); EW/PW 1.38–1.47 (1.43); TL/EW 1.61–1.68 (1.64).

Caudal margin of sternite VII ( Fig. 3 F) shallowly concave. Tergite VIII lightly sclerotized, trapezoidal, with long apodemes; sternite VIII lightly sclerotized, U-shaped, bearing short setae along apical part. Prehensor ( Fig. 3 G) as shown in figure; basal sclerite bicornute.

Measurements. Male (n = 12): TL 3.13–3.90 (3.41) mm; PW 1.35–1.68 (1.51) mm; PL 0.50–0.70 (0.58) mm; EL 2.55–3.20 (2.82) mm; EW 1.80–2.35 (2.03) mm.

Female (n = 5): TL 3.33–3.70 (3.52) mm; PW 1.45–1.58 (1.50) mm; PL 0.55–0.62 (0.57) mm; EL 2.78–3.10 (2.95) mm; EW 2.00–2.30 (2.14) mm.

Distribution. Micronesia (Yap Is., Chuuk state: Weno, Fefan and Moen Isls.), Guam.

Remarks. This species is closely related to Scirtes floresianus Champion, 1918 known from Indonesia ( Flores Is.), and differs from it by the lacking thumb-like projections along the parameres of the tegmen, and the short parameroids of the penis.

Etymology. The species is named after the type locality.

Figures

FIGURE 1. Holotype of Scirtes spp. A) Scirtes micronesianus sp. n.; B) Scirtes tinianensis sp. n.; C) Scirtes palauensis sp. n.; D) Scirtes gressitti sp. n.; E) Scirtes babeldaobensis sp. n.; F) Scirtes albotaeniatus sp. n. Scale bar = 1.0 mm.

FIGURE 2. Antennae of Scirtes spp. (above: male, under: female). A) Scirtes micronesianus sp. n.; B) Scirtes tinianensis sp. n.; C) Scirtes palauensis sp. n.; D) Scirtes gressitti sp. n.; E) Scirtes babeldaobensis sp. n.

FIGURE 3. Scirtes micronesianus sp. n. A – E) paratype, male: A) sternites V – VII; B) tergite VIII; C) tergite IX; D) tegmen; E) penis. F – G) paratype female: F) sternites V – VII; G) prehensor.