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 † Rovnoleptochromus ableptonoides sp. n. ( Figs 1 , 39–48 ) Type material. Holotype : Late Eocene of Europe , Rovno amber: sex unknown; inclusion in elongate, L-shaped piece of amber 17 mm long ( Fig. 1 ), collection number K-27418 ( SIZK ). Diagnosis. This is the only species of Rovnoleptochromus and can be identified on the basis of the generic diagnosis. Description. Body ( Figs 39–42 , 44–45 , 47–48 ) strongly elongate and flatten, dark brown; BL 2.10 mm . Head ( Figs 43 , 46, 48 ) broadest at large eyes, HL 0.35 mm , HW 0.38 mm ; vertex and frons seem confluent (but dorsally poorly visible); tempora longer than eyes; supraantennal tubercles indistinct. Punctures on head unclear, setae only partly visible ( Fig. 46 ), sparse, moderately long and erect. Antennae ( Figs 39–46, 48 ) long and slender, AnL about 0.98 mm , scape longer than antennomeres II–IV combined, pedicel less than half as long as scape, distinctly longer than antennomere III, all antennomeres elongate, flagellomeres sparsely covered with very long and suberect setae ( Figs 44 , 46 ). Pronotum ( Figs 41 , 47 ) partly distorted; PL 0.53 mm , PW 0.44 mm ; pronotal disc broadest near anterior fifth and strongly narrowing posteriorly; anterior pronotal margin broadly rounded, laterally confluent with lateral margins, sides strongly rounded in anterior third, subparallel in posterior third. Punctures on disc ( Fig. 47 ) small but distinct, separated by spaces about as wide as two diameters of puncture; setae ( Fig. 47 ) sparse, short and suberect. FIGURES 46–48. Holotype of Rovnoleptochromus ableptonoides sp. n. (K-27418). Head in ventrolateral view (46), pronotum and elytra in dorsal view (47), body in ventral view (48). Abbreviations: abp, antebasal pit; aest3, metanepisternum; an1−11, antennomere I −XI; fr, frons; hr, hypostomal ridge; lbr, labrum; lp2−3, labial palpomere II −III; md, mandible; mn, mentum; msvp, mesoventral process; mtvp, metaventral process; mvc, metaventral carina; mxp1−4, maxillary palpomere I −IV; pcmc, posterior carina of mesocoxal cavity; pgb, postgenal bristles; pn, pronotum; pnc, pronotal collar; ptp, posterior tentorial pit; slc2, mesoscutellum; smn, submentum; st3−8; abdominal sternite III −VIII; v3, metaventrite; vc, V-shaped carina. Elytra ( Figs 39–41 , 44–45 , 47 ) elongate oval, strongly flattened; EL 1,23 mm , EW 0.50 mm , EI 2.45; humeri weakly marked, sides of elytra nearly parallel in anterior third, weakly convergent posteriorly behind middle, rounded at apices; dorsal rows of pits distinct and deep, intervals between striae with 2–3 irregular rows of short suberect setae ( Figs 44 , 47 ). Hind wings present. Legs ( Figs 39–40, 42 , 44–45 , 48 ) long and slender. Etymology. The name ableptonoides was chosen to underline the significance of the median metaventral longitudinal carina, a character that Rovnoleptochromus shares with Ablepton and for the first time found in another genus of Mastigitae.