Exochomoscirtes bezdeki, Ruta & Yoshitomi, 2010

Ruta, Rafał & Yoshitomi, Hiroyuki, 2010, Revision of the genus Exochomoscirtes Pic (Coleoptera: Scirtidae: Scirtinae) 2598, Zootaxa 2598 (1), pp. 1-80 : 56-58

Exochomoscirtes bezdeki sp. nov.

( Figs. 13G–H , 45 , 46 )

Type material. Holotype, male ( EUM): “ LAOS Mt. Phu-Pan / Houa Phan Prov. / alt. ca 1,700–1,800 m / 17~ 20. VI. 2003 / N. Ohbayashi ” [printed label] . Paratypes. 2 females, 1 male ( EUM): same data as the holotype . 2 females ( DBET): “ LAOS, Hua Phan prov. / Ban Saluei, Phu Phan Mt., / 20°15’N, 104°02’E; 1500–2000 m / J. Bezdĕk leg., 26 IV–11 V 2001 ” [printed label]. Male ( EUM): “Phou Pan, 1750m / Xamneua, Laos / 16–21. VI. 2003 / M. Sato leg.” [printed label]. Female ( EUM): “Phu Pan (Mt.) / alt. 1500– 1,800 m / N20°11’ / E104°01‘ / Houaphan Prov., / North eastern Laos, / 12~ 21. V. 2005 ” [printed label]. Female ( EUM): “WaterFall, 5km W. / of BanSaleui 1350m / XamNeua, Laos / 5-V-2002, M. Sato ” [printed label]. Male ( EUM): “Sa Pa (1,500m)(L. T.) / Lao Cai Prov. / [N-VIETNAM] / 27. vi. 1997 / Masaaki Tomokuni leg.” [printed label]. Male ( EUM): “Deo Tram Ton (L.T) / Lao Cai Prov. / [N-VIETNAM] / 29. vi. 1997 / S. Nomura leg.” [printed label]. Female ( EUM): “N. Myanmar, Kachin / Mt. Shwe–Taung / alt. 1,900 m / 25. VI. – 19. VII. 2000 / S. Nagai & H. Miyama ” [printed label]. Female ( EUM): “Phou Samsoun, / Xieng Khouang prov. / 16.V.2008 / Wakahara, H. et al leg.” [handwritten label] .

Diagnosis. Large species, with depressed body and deep black dorsum. Resembling E. serricornis sp. nov., but antennae are filiform and body is larger. Tegmen has bifid apices of parameroids, prehensor is very narrow and elongated.

Description. Holotype, male. Body elongate oval, TL/EW 1.4, somewhat flattened, covered with black setae. Head black with brownish clypeal margin, pronotum and elytra black. Ventrum brown, legs brown with the exception of metafemora and basal portions of metatibiae which are brownish-black. Mouthparts and antennae light brown.

Head covered with small but dense punctures, punctures separated by ca. 0.5–1.0 diameter. Eyes big, protuberant; head 2.0 X wider than interocular space. Antennae filiform, antennomeres 5–11 missing in the holotype. Antennomeres 2 and 3 subequal in lengths, antennomeres 4 slightly shorter than antennomeres 2 and 3 combined. Palpomeres of maxillary palpi moderately widened.

Pronotum slightly convex, covered with distinct punctation, stronger, but sparser than those on head, separated by ca. 1.0–2.0 diameters, anterolateral corners almost right-angled, projecting anteriorly; lateral margins straight; posterolateral corners almost right-angled; base of pronotum subtrapezoidal, with complete groove along basal margin; PW/PL 2.6. Scutellum punctured as on pronotum, equilaterally triangular. Angle between pronotum and elytra not marked in dorsal outline.

Elytra oval, with slightly explanate lateral margins, and traces of three longitudinal ridges, widest a bit before the middle, punctation stronger than on pronotum, punctures separated by ca. 2.0 diameters; humeri well marked; EL/EW 1.2; EL/PL 4.9; EW/PW 1.6.

Legs moderately long. Hind tibial spurs well developed, dorsal one almost straight, unmodified, slightly shorter than tarsomere 1, and over twice as long as ventral one; ventral spur slightly curved.

Ventrites 1 and 2 with sparse setation in mesal portions, ventrites 2 and 3 with basal row of big punctures. Apex of ventrite 5 rounded. Sternite 9 (L 0.52, W 0.50) short, consisting of two broadly subtriangular hemisternites, with short setae on apical margin. Tergite 8 (L 0.86, W 0.55) well sclerotized, apical portion subtrapezoidal, apical margin arcuate, bearing row of distinct setae on apical margin, apodemes long, diverging basally; tergite 9 (L 0.46, W 0.50) small, moderately sclerotized, with narrow, subrectangular apical portion and indistinct setae at apex, with a pair of short, strongly diverging apodemes, fused in apical portion. Tegmen (L 0.74, W 0.48) large, well sclerotized, parameres straight with hooked, apical portions, relatively wide, apices trifid, mesal process narrow, widened in apical portion, long, slightly shorter than parameres. Penis (L 0.28, W 0.16) relatively large, pala elongated, narrowed in the middle of its length, parameroids short, broad, mesal process not marked.

Female. Externally indistinguishable from male, TL 4.80–5.90. Prehensor long (L 1.2), very narrow; bursal sclerite distinct, small.

Variability. TL/EW (same in males and females) 1.4–1.5 (1.4).

Measurements. Males (n = 5): TL 4.60–5.20 (5.02), PL 0.70–0.95 (0.88), PW 1.95–2.4 (2.25), EL 4.10– 4.65 (4.42), EW 3.10–3.80 (3.61). Females (n = 8): TL 4.80–5.90 (5.29), PL 0.75–1.00 (0.88), PW 2.10–2.60 (2.37), EL 4.20–5.15 (4.71), EW 3.20–4.18 (3.75).

Distribution. Laos, Vietnam, Myanmar.

Etymology. The species is dedicated to Dr. Jan Bezdĕk (Mendel University of Agriculture and Forestry, Brno, Czech Republic), specialist in Chrysomelidae , who collected this species in Laos.

Figures

FIGURE 13. Habitus illustrations of Exochomoscirtes. A) E. quadripartitus sp. nov.; B) E. discoidalis (Pic), male; C) E. discoidalis (Pic), female; D) E. thailandicus sp. nov.; E) E. serricornis sp. nov.; F) E. cambodiensis sp. nov.; G) E. bezdeki sp. nov., male; H) E. bezdeki sp. nov., female; I) E. nigromarginatus sp. nov.; J) E. sphaericus (Champion); K) E. globosus sp. nov.; L) E. buechei sp. nov.; M) E. dilaticornis sp. nov., male. Scale bar = 2.0 mm.

FIGURE 45. Exochomoscirtes bezdeki sp. nov., male. A) sternite 9; B) tergite 8; C) tergite 9; D) tegmen; E) penis. Scale bar = 0.5 mm.

FIGURE 46. Exochomoscirtes Bezděk sp. nov., female genitalia, b. scl. – bursal sclerite; preh. – prehensor.