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 frontalis sp. n. ( Figs 12 , 108–114 ) Type material. Holotype : Late Eocene of Europe , Rovno amber: sex unknown; inclusion in elongate, triangular prism of amber 21.5 mm long ( Fig. 12 ), collection number K-9579 ( SIZK ). Diagnosis. Rovnoscydmus with frons demarcated from vertex by faint, broadly and inversely V-shaped transverse carina; BL 0.88 mm ; EI 1.64. Description. Body ( Figs 108–112, 114 ) elongate, slender and relatively strongly convex, brown; BL 0.88 mm . Head ( Figs 108–114 ) broadest at eyes, HL 0.18 mm , HW 0.18 mm ; vertex and frons together subtrapezoidal and moderately transverse; frons anteriorly with faint transverse carina angulate at middle ( Fig. 113 ; frc ); supraantennal tubercles weakly raised but distinct; compound eyes large, strongly convex, oval; tempora about as long as eyes. Punctures on head fine and indistinct, separated by spaces as wide as 3–4 diameters of punctures; setae ( Fig. 112 ) short, sparse, suberect. Antennae ( Figs 108–114 ) shorter than half BL, AnL 0.38 mm , antennal club indistinctly demarcated; antennomeres I–II elongate, III transverse, IV–IX each about as long as broad, X slightly transverse, XI much shorter than IX–X combined, slightly longer than broad, with rounded apex. Pronotum ( Figs 108 , 112 ) elongate, broadest between middle and anterior third; PL 0.25 mm , PW 0.18 mm ; punctures on disc ( Fig. 112 ) small but distinct, separated by spaces 3–5 times as wide as diameters of punctures; setae ( Fig. 112 ) short, sparse and suberect, in anterior half of disc directed posteriorly, in posterior half posteromesally. Elytra ( Figs 108 , 112 ) elongate oval, strongly convex, broadest in between middle and anterior third, EL 0.45 mm , EW 0.28 mm , EI 1.43; punctures and setae similar to those on pronotum ( Fig. 112 ). Legs ( Figs 108–112, 114 ) moderately long, slender, unmodified. Etymology. The name frontalis refers to the frontal carina.