Exochomoscirtes pectinatus, Ruta & Yoshitomi, 2010

Ruta, Rafał & Yoshitomi, Hiroyuki, 2010, Revision of the genus Exochomoscirtes Pic (Coleoptera: Scirtidae: Scirtinae) 2598, Zootaxa 2598 (1), pp. 1-80 : 67-69

Exochomoscirtes pectinatus sp. nov.

( Figs. 4 , 14B , 55 )

Type material. Holotype, male ( ITBC): “ Kg. Mansiang, Men- / ggatal, Kotakinabalu , / Sabah, BORNEO/ 22.IV.2007 / H. Takizawa leg.” [printed label].

Diagnosis. E. pectinatus sp. nov. is a uniformly brown, moderate sized species with a unique brush-like structure on the metatibiae. Apices of parameroids are extremely widened, wider than in any other known Exochomoscirtes .

Description. Holotype, male. Body oval, TL/EW 1.3, slightly depressed, covered with yellow suberect setae. Body maroon brown, antennae and mouthparts yellowish-brown, legs yellowish-brown, metafemora darkened, dark brown.

Head with distinct punctation, punctures separated by ca. 0.5–1.0 diameter. Eyes big, protuberant; head 1.9 X wider than interocular space. Antennae filiform, reaching basal 1/3 of elytra. Antennomeres 2 and 3 of subequal lengths, antennomeres 4–11 1.5 times longer than antennomere 3. Palpomeres of maxillary palpi moderately widened.

Pronotum slightly convex, covered with distinct punctation, punctures separated by ca.1.0 diameter, anterolateral corners almost right-angled, projecting anteriorly; lateral margins straight; posterolateral corners acute; base of pronotum subtrapezoidal, with complete margination along basal margin; PW/PL 3.4. Scutellum relatively big, punctured as on pronotum, equilaterally triangular. Angle between pronotum and elytra not marked in dorsal outline.

Elytra oval, stronger diverging in posterior half, than in anterior portion, with slightly explanate lateral margins, widest at basal 1/3, punctation stronger and denser than on pronotum, punctures separated by ca. 0.5–1.0 diameter; humeri well marked; EL/EW 1.1; EL/PL 5.5; EW/PW 1.5.

Legs moderately long. Hind tibial spurs well developed, dorsal one curved, as long as tarsomere 1, ventral reaching 2/3 length of dorsal one, curved. Ventrolateral portion of hind tibiae with 5–7 rows of ca. 35 strong spines forming brush-like structure.

Apex of tergite 7 unmodified, apex of ventrite 5 bisinuate.

Sternite 9 (L 0.75, W 0.38) consisting of two subtriangular hemisternites rounded apically, with a row of very short apical setae. Tergite 8 (L 1.40, W 1.00) moderately sclerotized, very long, bearing row of short setae on apical margin, with a pair of very long apodemes diverging basally; tergite 9 (L 0.95, W 0.57) moderately sclerotized, apical portion small, with minute setae at apex, with a pair of moderately long apodemes diverging basally. Tegmen (L 0.83, W 0.37) well sclerotized, parameres straight, strongly widening apically, with indentation in mesal portions, mesal process indistinct. Penis (L 0.52, W 0.17) small, moderately sclerotized, pala pear-shaped.

Female unknown.

Measurements. Male (n = 1): TL 3.80, PL 0.60, PW 2.05, EL 3.30, EW 3.00.

Distribution. Sabah, Borneo.

Etymology. Lat. pecten = brush, specific epithet refers to the brush-like structure on metatibiae.

Figures

FIGURE 4. Exochomoscirtes pectinatus sp. nov., metatibia.

FIGURE 14. Habitus illustrations of Exochomoscirtes. A) E. dilaticornis sp. nov., female; B) E. pectinatus sp. nov.; C) E. longispinus sp. nov.; D) E. nipponicus sp. nov.; E) E. nahangensis sp. nov.; F) E. arunachalensis sp. nov.; G) E. meghalayensis sp. nov. Scale bar = 2.0 mm.

FIGURE 55. Exochomoscirtes pectinatus sp. nov., male. A) sternite 9; B) tergite 8; C) tergite 9; D) tegmen; E) penis. Scale bar = 0.5 mm.