Diversity of Scydmaeninae (Coleoptera: Staphylinidae) in Upper Eocene Rovno amber Author Jałoszyński, Paweł Author Perkovsky, Evgeny text Zootaxa 2016 4157 1 1 85 journal article 10.11646/zootaxa.4157.1.1 2389f078-1812-4b4e-826a-561cd7e46654 1175-5326 262413 6BF4514A-892F-499F-BC1E-B7920C7A00B0 † 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. FIGURES 118–119. Holotype of Rovnoscydmus microscopicus sp. n. (K-347). Habitus in dorsolateral (118) and ventral (119) views. Abbreviations: abg, antebasal groove; bef, basal elytral fovea; bst, basisternal part of prosternum; bsti, basistipes; fr, frons; gp, gular plate; gs, gular suture; hw, hind wing; hy, hypomeron; mn, mentum; lbr, labrum; lp, labial palp; mcp, mesocoxal projection; md, mandible; mn, mentum; mtvp, metaventral intercoxal process; mxp2–4, maxillary palpomere II–IV; nss, notosternal suture; pcr, procoxal rest; occ, occipital constriction; pg, pygidium; st3–8, abdominal sternite III–VIII; tm, temple; v2, mesoventrite; v3, metaventrite; vt, vertex. 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 ).