Exochomoscirtes thailandicus, Ruta & Yoshitomi, 2010

Ruta, Rafał & Yoshitomi, Hiroyuki, 2010, Revision of the genus Exochomoscirtes Pic (Coleoptera: Scirtidae: Scirtinae) 2598, Zootaxa 2598 (1), pp. 1-80 : 52-53

Exochomoscirtes thailandicus sp. nov.

( Figs. 13D , 42 )

Type material. Holotype, male ( DBET): “ Thailand, Mae Hong Son pr. / Kiwiom-pass near Soppong , / 23.vi.–2.vii.2002, 1400m, / WGS 84: 19°26’N, 98°19’E, / lgt. Fouqué R.+H.” [printed label].

Diagnosis. The species is externally similar to males of E. discoidalis (Pic) . It is distinguishable on the basis of genital morphology: parameres very long and narrow, with hooked apices (widened in E. discoidalis ).

Description. Holotype, male. Body elongate oval, TL/EW 1.4, slightly flattened, covered with blackish setae. Head, pronotum and scutellum yellowish-red, elytra dark brown with lighter humeral portion. Mouthparts and legs yellowish, metafemora darkened, brown. Antennae yellowish, darkening apically. Ventral portion of head, and prosternum yellow, meso-, metaventrite and abdomen brown.

Head with distinct punctation, punctures separated by ca. 1.0 diameter. Eyes big, protuberant; head 2.0 X wider than interocular space. Antennae filiform, antennomeres 6–11 absent in the holotype. Antennomeres 2 and 3 of subequal lengths, antennomeres 4–5 slightly shorter than antennomeres 2 and 3 combined. Palpomeres of maxillary palpi only slightly widened.

Pronotum slightly convex, covered with distinct punctation, similar to that on head, separated by ca. 1.0 diameter, anterolateral corners obtuse, slightly projecting anteriorly; lateral margins straight; posterolateral corners acute; base of pronotum subtrapezoidal, with complete margination along basal margin; PW/PL 2.9. Scutellum punctured as on pronotum, equilaterally triangular. Angle between pronotum and elytra not marked in dorsal outline.

Elytra oval, with slightly explanate lateral margins, widest at the basal 1/3, punctation stronger than on pronotum, punctures separated by ca. 1.0 diameter; humeri well marked; EL/EW 1.2; EL/PL 5.3; EW/PW 1.5.

Legs moderately long. Hind tibial spurs well developed, dorsal one slightly curved, unmodified, as long as 3/4 length of tarsomere 1, and twice as long as ventral one; ventral spur almost straight.

Ventrite 1 with sparse setation in mesal portion, ventrite 2 with basal row of big punctures. Apex of tergite 7 unmodified. Apex of ventrite 5 regularly rounded.

Sternite 9 (L 0.52, W 0.65) elongated, consisting of two hemisternites, with moderately long setae at apical margin. Tergite 8 (L 0.70, W 0.37) moderately sclerotized, apical portion subtrapezoidal, bearing very short setae on apical margin, apodemes short, slightly diverging basally; tergite 9 (L 0.55, W 0.17) small, moderately sclerotized, with very narrow apical portion and minute setae at apex, with a pair of moderately short apodemes, strongly diverging basally. Tegmen (L 0.83, W 0.47) large, well sclerotized, parameres sinuate, narrowing to apices, tempered and inwardly hooked at apices, mesal process very narrow, widened at apex, slightly exceeding half of the length of parameres. Penis (L 0.53, W 0.13) small, pala elongate, parameroids short, but distinct, mesal process almost as long as half the length of pala.

Female unknown.

Measurements. Male (n = 1): TL 3.55, PL 0.60, PW 1.71, EL 3.15, EW 2.56.

Distribution. NW Thailand.

Etymology. After terra typica, Thailand.

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