Amelyris (Amelyris) sveneldi Tshernyshev, Alekseev, Bukejs, Vasilenko, Legalov

Amelyris (Amelyris) sveneldi Tshernyshev, Alekseev, Bukejs, Vasilenko, Legalov & Perkovsky, sp. nov.

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( Figs 1–7 View FIGURES 1–7 )

Type material. Holotype No SIZK Be-26, adult, male; Rovno amber. Locus typicus. Belokorovychi vicinity , Korosten District, Zhitomir Oblast , Ukraine. Stratum typicum. Rovno amber, late Eocene .

Description. External colouration monochrome black-brown, without metallic lustre; dorsal setae dark brown to black. Body elongate, subparallel, flattened dorsally and moderately convex ventrally, slightly expanded and evenly rounded posteriorly. Measurements: body length 3.83 mm; body maximum width (in area of elytral base) 1.1 mm.

Head strongly prognathous, not sculptured, slightly convex, suboval, very weakly protruding distally and not wider than pronotum at eyes level; compound eyes oval, bean-shaped, large, weakly convex, bare; frons and interocular area flat, without impressions. Surface of head evenly and finely punctured, microsculpture distinct, surface sparsely covered with adpressed short, weakly visible hairs.Antennae 11-segmented, short, reaching to about the middle of the pronotum, attached to the head near the lower edge of the eyes near the clypeus, sparsely covered with short, semi-erect fine hairs. Antennomeres evenly dilated towards the apex forming lose 5-segmented club. Antennomere 1 swollen and enlarged, round-oval, 2.5× as long as antennomere 2; antennomere 2 oval-triangular; antennomere 3 elongate, subcylindrical, as long as antennomere 2, slightly narrower than antennomere 2 and 5 times as long as antennomeres 4, 5 or; antennomeres 7–10 broader, subtriangular, equilateral, forming loose club, approximately equal in lengths; antennomere 11 slightly longer than antennomere 10, flattened and evenly rounded, slightly narrowed apically. Clypeus slightly elongated and narrowed; labrum small, transverse and narrow, slightly emarginate in middle of distal side. Mandibles not covered by labrum, short, strong, rounded, bidentate. Maxillary palpi elongate, narrow, 4-segmented; palpomere 1 enlarged, round-oval, located on lateral side of clypeus below genae and clearly visible from dorsal side of head; three remaining palpomeres distinctly narrower, palpomeres 2 and 3 cylindrical; palpomere 4 elongate, narrowed and flattened towards apex, appearing subcylindrical. Labial palpi 4-segmented, with palpomeres of equal lengths, short; apical palpomere narrow and cylindrical.

Pronotum convex, slightly longer than wide, slightly narrowed anteriorly, with acute angles and typical bicarinate lateral side: upper carina straight and lower carina roundly prominent. The surface evenly and largely punctured; each puncture surrounded by raised limbus giving to surface cellular appearance; base of each cell distinctly microsculptured; margins of distal and basal sides and upper lateral carinae straight; lower carina provided with small protuberances or denticles. Pubescence small, curved, sparse. Disc distinctly impressed at posterior and anterior angles, narrowly impressed in centre of upper lateral carina.

Scutellum clearly visible, quadrate, with acute angles and straight sides, with small punctures and fine adpressed pubescence; disc mat, not marginate on sides.

Elytra carinate, elongate, subparallel, slightly convex just below middle, evenly narrowed posteriorly, with separately rounded apices, completely cover abdomen. Bases of elytra slightly broader than pronotum. Humeri distinct, small, not prominent, slightly impressed, with small short curved carina. Elytral disc probably mat. Each elytron with four full carinae; carina 1 (near-sutural) looks like elevated suture margin; carina 4 situated above flattened lateral side, distinct from basal quarter to apex of elytron. All carinae thin, distinct, not very prominent. Each interspace between carinae microsculptured, with three longitudinal regular rows of sparse, distinct punctures. Dorsal pubescence sparse, short, semi-recumbent, situated mainly on carinae. Elytral epipleura broad, extended to apex, with row of sparse punctures in middle, distinctly microsculptured. Metathoracic wings well developed.

Legs short, simple, not thickened, evenly flattened, densely and coarsely punctured to appear granular. Femora of all legs flattened and widened, not curved. Tibiae straight, evenly dilated to apex, spurs short and thin, same length as setae surrounding peripheral margin of tibia; surface of tibiae covered with short, black, strong, erect setae. All tarsi 5-segmented; tarsomeres strongly compressed, with short, black, erect hairs on periphery of pedal part. Basal tarsomeres small, triangular, 0.5× as long as corresponding tarsomeres 2 in anterior and posterior legs and 1.5× shorter than tarsomere 2 in intermediate legs; tarsomeres 2–4 in all legs equal in size, triangular, all combined 0.5× as long as tarsomere 5; tarsomere 5 longest. Tarsal claws distinct, narrow, sharp, symmetrical, with elongated basal tooth, giving claws bifid appearance.

Ventral side moderately convex, weakly shiny, finely and densely punctured, bare or with fine dense adpressed hairs not clearly visible under turbid surface in amber mass. Pygidium and last visible ventrite simple, slender, not depressed, with rectangular central emargination and tufts of several long, strong black bristles on outer margins of lateral sides.

Etymology. The specific epithet is a patronym; the new species is named after Sveneld, the semi-legendary 10th-century Varangian warlord that got tribute on the Drevlyan land.