Exochomoscirtes luteosuturaloides, Ruta & Yoshitomi, 2010

Ruta, Rafał & Yoshitomi, Hiroyuki, 2010, Revision of the genus Exochomoscirtes Pic (Coleoptera: Scirtidae: Scirtinae) 2598, Zootaxa 2598 (1), pp. 1-80 : 43-45

Exochomoscirtes luteosuturaloides sp. nov.

( Figs. 6 , 12F , 34 )

Type material. Holotype, male ( EUM): “ Sepilok, Sandakan / Sabah, Borneo / VII. 1983 / S. Nagal leg.” [printed label].

Diagnosis. Similar to E. luteosuturalis sp. nov., but the basal yellow spots on elytra are distinctly larger. Tergite 8 elongated, much longer than in E. luteosuturalis sp. nov., and parameroids of penis distinctly shorter than pala (in E. luteosuturalis sp. nov. – as long as pala). It may be distinguished from E. jaechi sp. nov. on the basis of the more contrasting dorsal pattern and morphology of sternite 9, which is wider in apical portion and tergite 8 with longer parameres.

Description. Holotype, male. Body elongate oval, TL/EW 1.3, slightly depressed, covered with brownish-black setae. Head yellowish-brown, pronotum and scutellum brownish-black, elytra brownish black with yellow maculation. Each elytron with a large oval yellow spot in basal portion, near anterior edge, and distinct yellow adsutural portion in posterior 3/4 length. Mouthparts yellow, antennomeres light brown. Ventrum and legs brown, hind femora dark brown.

Head covered with small but dense punctures, separated by ca. 1.0–2.0 diameters. Eyes big, protuberant; head 1.9 wider than interocular space. Antennae filiform, antennomeres 2 and 3 of subequal lengths, antennomeres 5–11 absent in the holotype. Palpomeres of maxillary palpi only slightly widened.

Pronotum slightly convex, covered with distinct punctation, punctures similar to those on the head, but sparser, separated by ca. 1.5–2.0 diameters, anterolateral corners nearly right-angled, somewhat obtuse, projecting anteriorly; lateral margins straight; posterolateral corners acute; base of pronotum subtrapezoidal, with incomplete margination along basal margin; PW/PL 2.8. Scutellum punctured as on pronotum, equilaterally triangular. Angle between pronotum and elytra not marked in dorsal outline.

Elytra elongate oval, with slightly explanate lateral margins, widest in the middle, punctation stronger than on pronotum, punctures separated by ca. 1.0–2.0 diameters; humeri well marked; EL/EW 1.2; EL/PL 4.7; EW/PW 1.5.

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

Ventrite 1 with sparse setation in mesal portion, ventrite 2 with basal row of big punctures. Apex of tergite 7 with a narrow, bifid process. Apex of ventrite 5 very shallowly emarginated.

Sternite 9 (L 0.40, W 0.13) elongated, deeply emarginated at apex, apodemes fused basally, with several moderately long setae at apex. Tergite 8 (L 0.96, W 0.41) long, moderately sclerotized, apical portion subtrapezoidal, with row of setae on apical margin, apodemes long, slightly diverging basally; tergite 9 (L 0.58, W 0.33) moderately sclerotized, apical portion with minute setae at apex, with a pair of slightly diverging apodemes. Tegmen (L 0.47, W 0.39) well sclerotized, parameres straight, very narrow, slightly widened at apices, mesal process very narrow, longer than half length of parameres. Penis (L 0.36, W 0.14) moderately sclerotized, pala pear-shaped, parameroids distinctly shorter than pala.

Female unknown (see note under E. luteosuturalis description).

Measurements. Male (n = 1): TL 4.05, PL 0.75, PW 2.08, EL 3.55, EW 3.05.

Distribution. Borneo.

Etymology. Specific epithet refers to the similarity to E. luteosuturalis sp. nov.

Figures

FIGURE 6. Exochomoscirtes luteosuturaloides sp. nov. A) ventrites 1–4; B) ventrite 5 (note two small foveae marked with arrows).

FIGURE 12. Habitus illustrations of Exochomoscirtes. A) E. maculatus (Waterhouse); B)–C) E. ceylonicus sp. nov.; D) E. decemguttatus (Champion); E)–G) E. klausnitzeri sp. nov., color forms F – S Thailand, male, E and G – Sarawak, females; H) E. cf. klausnitzeri (NW Thailand); I) E. luteosuturalis sp. nov.; J) E. cf. luteosuturalis sp. nov., female, Sulawesi; K) E. cf. luteosuturalis, female, Vietnam; L) E. luteosuturaloides sp. nov.; M) E. jaechi sp. nov.; N) E. ruforotundus (Watts); O) E. ruforotundus (Watts), Bali. Scale bar = 2.0 mm.

FIGURE 34. Exochomoscirtes luteosuturaloides sp. nov. A) sternite 9; B) tergite 8; C) tergite 9; D) tegmen; E) penis. Scale bar = 0.5 mm.