Eduardoxenus unicus, Legalov & Nazarenko & Perkovsky, 2018

Legalov, Andrei A., Nazarenko, Vitaliy Y. & Perkovsky, Evgeny E., 2018, A new genus of fungus weevils (Coleoptera: Anthribidae) in Rovno amber, Fossil Record 21 (2), pp. 207-212 : 209

Eduardoxenus unicus sp. nov.

Figs. 1–4 .

Etymology: The specific epithet is from the Latin “unicus ” (only, sole, single).

Holotype: SIZK K-25439, Klesov , Rovno amber, late Eocene.

Type locality: Klesov.

Description: Size: length of body (without rostrum), 1.4 mm; length of rostrum, 0.2 mm. Body, black, covered with sparse short hairs, appears silvery shiny due to presence of cavities between specimen and internal surface of its impression. Head: about 1.8 times as long as rostrum; rostrum moderately short, about 0.6 times as long as it is wide at the apex and middle, about 0.5 times as long as it is wide at the base, about 0.3 times as long as the pronotum, straight, densely punctate, without dorsal median carina; labrum free, almost wide-rectangular; mandibles large; rostral pleurostomal sinus deep; forehead wide, about 1.1 times as wide as the rostrum base width; eyes large, convex, about 1.4 times as long as they are wide, with 9–10 rows of facets perpendicular to maximum length; vertex weakly flattened, finely punctate; temples moderately short; antennal scrobes foveiform; antennae inserted next to the lower portion of eyes dorsally, not geniculate, moderately long, reach elytral humeri; antennomeres 1–8 conical; antennomere 1 about 2.5 times as long as it is wide; antennomere 2 about 1.9 times as long as it is wide, 0.7 times as long as and 0.9 times as wide as antennomere 1; antennomere 3 about 3.3 times as long as it is wide, 0.8 times as long as and 0.4 times as wide as antennomere 2; antennomere 4 about 2.4 times as long as it is wide, 0.6 times as long as and 0.8 times as wide as antennomere 3; antennomeres 3 and 4 subequal in length; antennomere 5 about 3.0 times as long as it is wide, 0.8 times as wide as antennomere 4; antennomeres 5 and 6 subequal in width; antennomere 6 about 2.5 times as long as it is wide, 0.8 times as long as antennomere 5; antennomere 8 about 2.0 times as long as it is wide; club not compact; antennomere 9 conical, about 1.8 times as long as it is wide, 1.4 times as long as and 1.6 times as wide as antennomere 8; antennomere 10 about 1.8 times as long as it is wide, 1.3 times as long as and 1.3 times as wide as antennomere 9; antennomere 11 drop-shaped, subequal in length and wide to antennomere 10. Pronotum: bell-shaped; disk weakly flattened, densely and rugosely punctate; transverse dorsal pronotal carina antebasal, almost straight; distance between transverse carina and base of pronotum 0.3 times as long as the pronotum; lateral carina long, almost reaching apical margin of pronotum. Mesonotum: scutellum small, almost semicircular, lays in the pentagonal scutellar groove. Elytra: distinctly convex, about 2.5 times as long as the pronotum; greatest width in the middle, lacking scutellar striole; elytron without tubercles; humeri weakly convex; striae regular and distinct; strial punctures quite small, rounded, sparse; elytral intervals flattened, wide, about 1.5–2.0 times as wide as the striae, sparsely and finely punctate; covered with sparse short thin sub-recumbent setae arranged in irregular rows on interstriae, slightly shorter and thinner setae on the borders of strial punctures; epipleuron distinct. Thorax: coarsely punctate; pre- and postcoxal portions of prosternum short; procoxal cavities narrowly separated; mesocoxal cavities rounded, narrowly separated; metanepisternum narrow, 9.8 times as long as it is wide in the middle. Metaventrite about 3.1 times as long as the metacoxal cavity length. Abdomen: convex, weakly flattened in middle; ventrite 1 about 1.6 times as long as the length of metacoxal cavities; ventrite 2 about 0.9 times as long as the length of ventrite 1; ventrite 3 about 0.9 times as long as the length of ventrite 2; ventrite 4 about 0.7 times as long as the length of ventrite 3; ventrite 5 about 1.8 times as long as the length of ventrite 4; pygidium concealed by elytra. Legs: long; pro- and mesocoxae round; metacoxae transverse; femora weakly clavate, without teeth; profemora about 2.2 times as long as they are wide; metafemora about 2.6 times as long as they are wide; tibiae almost straight, without apical spurs; protibiae about 6.9 times as long as they are wide in the middle; mesotibiae about 8.7 times as long as they are wide at the middle; metatibiae about 11.5 times as long as they are wide at the middle; tarsi long; tarsomeres 1–3 with pulvilli on the underside; tarsomeres 1–3 conical; tarsomere 2 embracing tarsomere 3 laterally; tarsomere 3 bilobed; tarsomere 4 short; tarsomere 5 elongate; tarsal claws divergent, with large teeth at base; protarsi: tarsomere 1 about 1.7 times as long as it is wide; tarsomere 2 about 1.4 times as long as it is wide, 1.1 times as long as and 1.3 times as wide as tarsomere 1; tarsomere 3 about 1.3 times as long as it is wide, 0.6 times as long as and 0.7 times as wide as tarsomere 2; tarsomere 5 about 7.0 times as long as it is wide, 2.6 times as long as and 0.5 times as wide as tarsomere 3; mesotarsi: tarsomere 1 about 2.2 times as long as it is wide; tarsomere 2 about 1.6 times as long as it is wide, 1.1 times as long as and 1.5 times as wide as tarsomere 1; tarsomere 3 about 1.1 times as long as it is wide, 0.6 times as long as and 0.9 times as wide as tarsomere 2; tarsomere 5 about 4.8 times as long as it is wide, 2.1 times as long as and 0.5 times as wide as tarsomere 3.

Figures

Figure 1. Eduardoxenus unicus gen. et sp. nov.: (a) body, ventral view; (b) body, dorsal view. Bar = 0.5 mm.

Figure 2. Eduardoxenus unicus gen. et sp. nov.: (a) body, lateral view; (b) first half of body. Bar = 0.2 mm.

Figure 3. Eduardoxenus unicus gen.et sp. nov.: (a) contour of body, ventral view; (b) contour of body, dorsal view. Bar = 0.5 mm.

Figure 4. Eduardoxenus unicus gen.et sp. nov.: (a) contour of body, lateral view; (b) contour of first half of body. Bar = 0.2 mm.