Rovnoscydmus

Jałoszyński, Paweł & Perkovsky, Evgeny, 2016, Diversity of Scydmaeninae (Coleoptera: Staphylinidae) in Upper Eocene Rovno amber, Zootaxa 4157 (1), pp. 1-85 : 41-42

† Rovnoscydmus sp. specimen 1

( Figs 14 , 120–125 )

Material studied. Late Eocene of Europe , Rovno amber: sex unknown; inclusion in elongate prism of amber 11 mm long ( Fig. 14 ), collection number K-25702 ( SIZK).

Description. Body ( Figs 120–125 ) elongate, slender and relatively strongly convex, light brown; BL 1.00 mm.

Head ( Figs 120–121 , 123–124 ) broadest at eyes, HL 0.20 mm, HW about 0.13 mm; vertex and frons confluent, together subtrapezoidal and moderately transverse; supraantennal tubercles weakly raised but distinct; compound eyes large, strongly convex, oval; tempora distinctly shorter than eyes. Punctures on frons and vertex ( Fig. 123 ) fine and unremarkable, separated by spaces 3–4 × as wide as diameters of punctures; setae ( Fig. 123 ) sparse, short and nearly recumbent. Antennae ( Figs 120–121 , 123–124 ) much shorter than half BL, AnL 0.40 mm, antennal club not demarcated; antennomeres I–II elongate, III–IV about as long as broad or slightly elongate, V–VII about as long as broad, VIII transverse, IX and X distinctly transverse, XI much shorter than IX–X combined, about 1.3 × as long as broad, with rounded apex.

Pronotum ( Figs 120 , 123 ) elongate, broadest site not possible to define; PL 0.25 mm, PW 0.20 mm; punctures on disc ( Fig. 123 ) small but distinct, separated by spaces 3–4 × as wide as diameters of punctures; setae ( Fig. 123 ) short and sparse, nearly recumbent, on sides of pronotum replaced by distinct thick bristles.

Elytra ( Figs 120 , 123 ) elongate oval, strongly convex, broadest site not possible to define, EL 0.55 mm, EW 0.30 mm, EI 1.83; punctures and setae similar to those on pronotum ( Fig. 123 ).

Legs ( Figs 120–125 ) moderately long, slender, unmodified.

Remarks. This specimen differs from R. frontalis and R. microscopicus in proportions of body parts, but its external characters are unremarkable and do not allow for a reliable diagnosis of a new species. Structures of the mesoventrite are exceptionally well exposed in this inclusion ( Fig. 125 ).

Figures

FIGURES 1 – 20. Specimens of Rovno amber with inclusions of Scydmaeninae. K- 27418, Rovnoleptochromus ableptonoides sp. n. (1); K- 243, Vertheia quadrisetosa sp. n. (2); UA- 442, Vertheia sp. 1 (3); K- 800, Cephennodes sp. 1 (4); K- 6011, Cephennomicrus giganteus sp. n. (5); K- 8289, Cephennomicrus sp. 1 (6); K- 7010, Cephennomicrus sp. 2 (7); K- 27565, Cephennomicrus sp. 3 (8); K- 8912, Cephennomicrus sp. 4 (9); DU- 32, Cephennomicrus sp. 5 (10); K- 5770, Glaesoconnus unicus sp. n. (11); K- 9579, Rovnoscydmus frontalis sp. n. (12); K- 347, Rovnoscydmus microscopicus sp. n. (13); K- 25702, Rovnoscydmus sp. specimen 1 (14); K- 26348, Rovnoscydmus sp. specimen 2 (15); UA- 1556, Rovnoscydmus sp. specimen 3 (16); K- 8970, Rovnoscydmus sp. specimen 4 (17); K- 8968, Rovnoscydmus sp. specimen 5 (18); K- 7350, Rovnoscydmus sp. specimen 6 (19); K- 3037, Rovnoscydmus sp. specimen 7 (20).

FIGURES 120 – 122. Rovnoscydmus sp. specimen 1 (K- 25702). Dorsolateral (120), ventrolateral (121) and ventral (122) view.

FIGURES 123 – 125. Rovnoscydmus sp. specimen 1 (K- 25702). Dorsolateral (123), ventrolateral (123) and ventral (125) view. Abbreviations: abg, antebasal groove; bef, basal elytral fovea; bst, basisternal part of prosternum; fr, frons; hy, hypomeron; mn, mentum; lbr, labrum; lp, labial palp; mcp, mesocoxal projection; md, mandible; mn, mentum; mtvp, metaventral intercoxal process; mxp 2 – 4, maxillary palpomere II – IV; nr, ' neck' region; pcr, procoxal rest; st 3 – 8, abdominal sternite III – VIII; tm, temple; v 3, metaventrite; vt, vertex.