Exochomoscirtes basipunctatus, Ruta & Yoshitomi, 2010

Ruta, Rafał & Yoshitomi, Hiroyuki, 2010, Revision of the genus Exochomoscirtes Pic (Coleoptera: Scirtidae: Scirtinae) 2598, Zootaxa 2598 (1), pp. 1-80 : 22-23

Exochomoscirtes basipunctatus sp. nov.

( Figs. 11B , 16 )

Type material. Holotype, male ( EUM): “Trus Madi / N. Borneo / 11.IV.1993 / H. Karube ” [printed label] . Paratype, male ( EUM): “[E. Malaysia] / 16 miles point / from Keningaw / Sabah, Borneo Is. / 9.iii.1993 / T. Ueno leg.” [printed label]; “genitalia in slide / No. HY 978” [printed & handwritten label] .

Diagnosis. Externally resembling E. bimaculatus Pic and E. bipustulatus (Champion) , but E. basipunctatus is distinctly larger than E. bimaculatus , and has a flattened body (which is strongly convex in E. bimaculatus and E. bipustulatus ). Tegmen 8 uniquely modified.

Description. Holotype, male. Body elongate oval, TL/EW 1.4, flattened, covered with whitish suberect setae. Head and pronotum brownish-black, elytra brownish-black, each with large oval macula in basal portion, reaching 1/4 length of elytra. Mouthparts, antennae and legs brown.

Head covered with dense punctures, separated by ca. 1.0 diameter. Eyes big, moderately protuberant; head 1.8 X wider than interocular space. Antennae filiform, antennomere 1 subcylindrical, antennomeres 2 and 3 subequal in length, antennomeres 4–10 1.5 X longer than antennomere 3. Apical antennomere absent in the holotype. Palpomeres of maxillary palpi moderately wide.

Pronotum slightly convex, covered with dense punctation, punctures separated by ca. 1.0–2.0 diameter, anterolateral corners projecting anteriorly, somewhat obtuse; lateral margins straight; posterolateral corners acute; base of pronotum subtrapezoidal, groove along basal margin indistinct in mesal portion; PW/PL 2.9. Scutellum punctured as on pronotum, equilaterally triangular. Angle between pronotum and elytra not marked in dorsal outline.

Elytra broadly oval, without traces of longitudinal ridges, with explanate lateral margins, widest in the middle, punctation stronger than on pronotum, distance between punctures ca. 1.0 diameter; humeri well marked; EL/EW 1.2; EL/PL 7.0; EW/PW 1.5.

Legs moderately long. Hind tibial spurs well developed, longer spur almost straight, almost as long as tarsomere 1, shorter spur slightly curved, slightly shorter than 1/2 of the length of longer spur.

Ventrites 1 and 2 with sparse setation in mesal portions, ventrite 2 with basal row of big punctures. Apex of tergite 7 unmodified. Apex of ventrite 5 widely emarginate.

Sternite 9 (L 0.90, W 0.55) elongated, narrowed in median portion, apical portion with short setae on margin, apices well sclerotized. Tergite 8 (L 1.50, W 0.50) large, with paired elongate processes which apices are armed with numerous spines, apodemes moderately long, subparallel; tergite 9 (L 1.40, W 0.37) long, very narrow, moderately sclerotized, with very narrow apical portion and without setae at apex, with a pair of very long, subparallel apodemes. Tegmen (L 1.25, W 0.67) large, well sclerotized, parameres relatively narrow, with widened apical portions, median process very narrow, much longer than parameres. Penis (L 1.15, W 0.17) relatively big, parameroids very narrow, as long as mesal process, mesal process distinctly longer than pala.

Female unknown.

Measurements. Males (n = 2): TL 3.85–4.62, PL 0.65–0.80, PW 1.98–2.30, EL 3.35–4.20, EW 3.00– 3.43. Distribution. Borneo.

Etymology. The specific epithet refers to the maculae situated in basal portion of elytra.

Figures

FIGURE 11. Habitus illustrations of Exochomoscirtes. A) E. bimaculatus Pic; B) E. basipunctatus sp. nov.; C) E. binotatus Pic; D) E. rufomaculatus Pic; E) E. ephippiatus (Champion); F)–I) E. picturatus sp. nov., color forms; J)–L) E. takizawai sp. nov., color forms; M) E. tetrastigma (Champion). Scale bar = 2.0 mm.

FIGURE 16. Exochomoscirtes basipunctatus sp. nov. A) sternite 9; B) tergite 8; C) tergite 9; D) tegmen; E) penis; F) apex of penis, closeup. Scale bar = 0.5 mm (with the exception of F).