Microtrachelizus platycephalus Mantilleri, 2013

Mantilleri, Antoine, 2013, A New Species ofMicrotrachelizusSenna, 1893 (Coleoptera: Brentidae: Cyphagoginae: Hoplopisthiini) from Sumatra, The Coleopterists Bulletin 67 (2), pp. 186-187 : 186-187

Microtrachelizus platycephalus Mantilleri , new species

Type Material. Holotype: ♀, “ East Sumatra: Riau, Bukit Tigapulah N. P., 0°50′S 102°26′ E, 18-25.I.2000, D. Hauck. ” Deposited in NHM.

Description of Holotype. Length from apex of rostrum to apex of elytra 4.1 mm; width across humeral calli 0.7 mm. Reddish brown without darker postmedian blotch on elytra. Habitus: Fig. 1 . Head ( Fig. 2 ): Quite flattened, strongly punctate, with basal notch. Frons grooved, groove vanishing on metarostrum. Temples short, slightly protruding behind eyes. Metarostrum, mesorostrum, and prorostrum punctate and setose. Prorostrum 0.65 times as long as head + metarostrum + mesorostrum. Lateral grooves of metarostrum not distinct. Antennal segments 2–8 broader than long; 3 conical; 4–8 cylindrical; 9–10 subcylindrical; 11 1.7 times longer than 10. Venter of head and metarostrum grooved. Thorax ( Fig. 2 ): Pronotum slightly convex, shiny, glabrous, punctate, grooved only at base. Prosternum foveate in front of procoxae; prosternellum not distinct. Protibiae 0.81 times as long as profemora. Calcar at apex of protibiae not longer than first protarsomere. Metasternum convex, grooved, laterally not carinate. Elytra concave at base, glabrous, shiny. Interstria 2 distinct from base to apex, not reduced in middle; interstria 4 distinct from base to apical declivity; interstria 5–7 fused anteriorly to form humeral callus; interstria 8 starting just before end of anterior half; interstria 9 forming external apical border of elytron. Apex of elytra rounded, hardly rimmed. Hindwings with very weakly sclerotized basal sclerite.

Abdomen ( Fig. 3 ): Sternites III-IV slightly convex and punctate, laterally weakly carinate only in fore part; V-VI without basal notch; VII with weak basal notch, shallow latero-apical depressions, without apical fovea. Tergite VIII of female denticulate at apex. Gonocoxites with 1 lateral lobe. Spermatheca: Fig. 4 .

Male. Unknown.

Etymology. The specific epithet derives from the Greek “platy-” (flat) and “cephalon” (head), because of the quite flattened head of this species. It is used as an adjective.

Diagnosis. This species is distinct from all other Microtrachelizus by the combination of the following characters: elytral interstria 2 distinct at base, longitudinal pronotal groove distinct only at base, elytra glabrous, lateral grooves of metarostrum not distinct, head and pronotum strongly punctate. In the key given by Mantilleri (2012), this species sorts out with Microtrachelizus macrophthalmus Mantilleri, 2010 from Thailand, but M. platycephalus is easily distinguished from it by the numerous punctures on the head and pronotum.

Figures

Figs. 1–4. Microtrachelizus platycephalus, ♀ holotype. 1) Habitus (abdomen removed); 2) Head and pronotum;