Eurystyrax, Gabris, Radim, Kundrata, Robin & Trnka, Filip, 2016

Gabris, Radim, Kundrata, Robin & Trnka, Filip, 2016, Review of Dolichostyrax Aurivillius (Cerambycidae, Lamiinae) in Borneo, with descriptions of three new genera and the first case of (ovo) viviparity in the long-horned beetles, ZooKeys 587, pp. 49-75 : 57-58

Taxon classification Animalia Coleoptera Cerambycidae

Genus Eurystyrax gen. n.

Type species.

Eurystyrax nemethi sp. n.

Diagnosis.

The Eurystyrax nemethi gen. et sp. n. can be easily recognized by its robust body (BL 14.3 mm), genae parallel-sided at frontal view (Fig. 43), elytra with distinct ridges without individual tubercles (Fig. 40), and outer elytral margin straight at lateral view (Fig. 41).

Description.

Female. Body robust, elongate, BL 14.3 mm, BW 5.1 mm. Body black, densely clothed with very short greyish pubescence, incorporating fine detritus particles.

Head about as wide as anterior pronotal margin, subquadrate at frontal view (genae parallel-sided); frontoclypeus with midline running from interantennal groove to labrum, sparsely punctured; antennal tubercles prominent with deep depression in between; anterior margin of anteclypeus shallowly emarginate, with sparse long yellowish semi-erected setae (Fig. 43). Labrum free, transverse, glabrous, with sparse long erected setae at apical half; frontal margin with very short dense golden pubescence. Eyes rather small, reniform, vertically elongate, slightly emarginate at antennal articulations, lower lobes distinctly narrower than genae. Antennae 11-segmented, 0.6 times as long as body; scape enlarged, slightly curved, longest, reaching about half of pronotum, gradually widened towards apex, thickest at apical part, surface smooth, covered with very short dense pale pubescence; the rest of antennomeres with sparser pubescence, pedicel very small, shortest, the relative ratio of antennomere lengths: 3.4: 0.4: 1.0: 1.1: 0.8: 0.8: 0.7: 0.6: 0.6: 0.7: 1.4 (Fig. 44), antennomere III 2.4 times as long as wide. Mandibles short and broad, apex unidentate (Fig. 6). Maxillary palpi 4-segmented, apical palpomere fusiform. Labial palpi 3-segmented, apical palpomere of same shape as maxillary one.

Prothorax sub-cylindrical, as long as wide, widest at middle, gradually slightly narrowed towards posterior margin, laterally without tubercles; pronotal disc sub-parallel sided, weakly convex, surface coarsely wrinkled, without distinct tubercles, sparsely covered with deep puncturation, anterior and posterior angles obtuse (Fig. 40). Prosternum in front of coxae 0.8 times shorter than diameter of coxal cavity, procoxal cavities circular, narrowly separated (Fig. 42). Scutellum transverse, about four times as wide as long. Elytra elongate, sub-parallel, 1.7 times as long as wide at widest part, 2.2 times as long as pronotum, basally slightly wider than posterior pronotal margin, widest near middle, from middle gradually slightly tapered towards apex; each elytron with three elevated ridges, without individual tubercles, sparsely covered with deep punctures arranged in rows; outer elytral margin straight at lateral view (Fig. 41). Mesoventrite with anterior edge on different plane than metaventrite. Mesocoxal cavities circular, separated slightly wider than in procoxal cavities. Metaventrite transverse, more than 2.5 times wide as long, posterior margin emarginated, with wide moderately deep median emargination. Metacoxal cavities separated slightly wider than mesocoxal ones, extending laterally to meet elytra (Fig. 42). Hind wing absent. Legs long, slender; femora weakly swollen distally, not reaching elytral apex; tibial spurs 2-2-2, protibiae with pubescent groove (antennal cleaner) on inner face, mesotibiae with pubescent groove on outer face, metatibiae without groove; tarsal formula 4-4-4; relative lengths of metatarsomeres 1.0: 0.7: 1:0: 1.5; last tarsomere with four long erected setae at ventral face, claws simple, empodium absent.

Abdomen with five ventrites; first ventrite (excluding intercoxal process) more than 1.5 times longer than second; intercoxal process short, broadly rounded (Fig. 42). Fifth ventrite with apex truncate, margin with sparse semi-erect pubescence. Female genitalia with ovipositor elongate, narrow, apically with short styli (Fig. 45). Vagina narrow, with pair of vaginal plates. Bursa copulatrix small. Spermatheca present, well-sclerotized, simple, elongate, slightly curved, widened basally; sclerotized part of spermathecal duct simple, short (Fig. 46).

Male unknown.

Etymology.

The name Eurystyrax is a combination of words “eury” (referring to the wide habitus of the holotype) and “styrax” (part of the generic name Dolichostyrax ). Gender: masculine.