Igneonasus rudolphi, Legalov & Poschmann, 2020

Legalov, Andrei A. & Poschmann, Markus J., 2020, New genus of the tribe Ceutorhynchini (Coleoptera: Curculionidae) from the late Oligocene of Enspel, southwestern Germany, with a remark on the role of weevils in the ancient food web, Fossil Record 23 (2), pp. 197-204 : 199-200

Igneonasus rudolphi gen. et sp. nov.

urn:lsid:zoobank.org:act:6BDF0F29-C03F-46FD-

86F1-337D9A94F171

Figs. 1–2

Etymology

The specific epithet is for Martin Rudolph (Westerburg) and his engagement at the Stöffel-Park and Fossillagerstätte Enspel.

Type material

Holotype: specimen PE 2013/5017- LS, deposited in the Landessammlung für Naturkunde Rheinland-Pfalz.

Type locality and stratum

Enspel/Westerwald, Germany. Late Oligocene Enspel Formation sensu Schäfer et al. (2011).

Description

Size: length of body (without rostrum), 7.8 mm; length of rostrum, 2.6 mm. Body black.

200 A. A. Legalov and M. J. Poschmann: New genus of the tribe Ceutorhynchini ( Coleoptera : Curculionidae )

Head: rostrum long, 1.2 times as long as pronotum, 8.1 times as long as wide at apex, 7.2 times as long as wide in middle, 5.0 times as long as wide at base, subcylindrical, distinctly curved, densely punctate, not separated from head by transverse impression; antennal scrobes lateral and directed toward ventral margin of eye; forehead flattened, punctured; eyes large, rounded, 1.2 times as long as wide, slightly wider than rostrum base wide; vertex weakly convex, densely punctate; temples 0.5 times as long as eye length; antennae inserted in apical third of rostrum.

Pronotum: bell-shaped; transverse; anterior margin of pronotum not raised; disc weakly convex in basal half, narrowed at apex, densely punctuate, with longitudinal median sulcus; distance between points distinctly less than diameter of points; sides coarsely punctuate, without tubercles; scutellum almost triangular, flattened, punctate.

Elytra: plumb, weakly flattened, 1.8 times as long as pronotum; elytron 2.4 times as long as wide at base, 2.0 times as long as wide in middle, 3.1 times as long as wide at apical fourth; greatest width in humeri, elytral base wider than pronotum base wide; humeri convex; striae regular, deep, narrow; interstriae flattened, wide, 7.0–9.0 times as wide as striae, punctuate; apex of each elytron rounded.

Thorax: coarsely punctured; prosternum with distinct median rostral channel; postocular lobes present; precoxal portion of prosternum elongated, about 2.2 times as long as procoxal length; postcoxal portion of prosternum short; mesoventrite with rostral channel; mesepimeron strongly ascending; metaventrite subequal to metacoxal length; metepisternum wide at base, further narrow, 2.7 times as long as wide at base, 12.5 times as long as wide in middle.

Abdomen: convex ventrally, coarsely punctured, distance between points longer than diameter of points; ventrites 1 and 2 elongated, fused; ventrite 1, 1.3 times as long as metacoxa length; ventrite 2, 0.6 times as long as ventrite 1; ventrites 3 and 4 short; ventrite 4, 0.6 times as long as ventrite 2; ventrite 5, 2.4 times as long as ventrite 4. Pygidium convex, exposed beyond elytra.

Legs: legs long; procoxae subconical; metacoxae transverse; femora weakly clavate, without teeth; profemora 4.7 times as long as wide in middle; wide of profemora 1.5 times as long as wide of rostrum in middle; metafemora not thicker than other femora; tibiae quite wide, almost straight, without uncus; protibiae 5.7 times as long as wide in middle; metatibiae 5.5 times as long as wide in middle; tarsi long; tarsomeres 1 and 2 conical; mesotarsomere 1, 1.6 times as long as wide; metatarsomere 1, 1.7 times as long as wide at apex.

Figures

Figure 1. Igneonasus rudolphi gen. et sp. nov., holotype PE 2013/5017-LS, habitus, lateral view. Scale bar = 1.0 mm.

Figure 2. Igneonasus rudolphi gen. et sp. nov., holotype PE 2013/5017-LS, contour of body, lateral view. Scale bar = 1.0 mm.