Rovnoscydmus

Jałoszyński, Paweł & Perkovsky, Evgeny, 2016, Diversity of Scydmaeninae (Coleoptera: Staphylinidae) in Upper Eocene Rovno amber, Zootaxa 4157 (1), pp. 1-85 : 45-48

† Rovnoscydmus sp. specimen 4

( Figs 17 , 135–138 )

Material studied. Late Eocene of Europe , Rovno amber: sex unknown; inclusion in elongate, trapezoidal prism of amber 12 mm long ( Fig. 17 ), collection number K-8970 ( SIZK).

Description. Body ( Figs 135–138 ) elongate, slender and relatively strongly convex, light brown; BL 0.93 mm.

Head ( Figs 135–138 ) broadest at eyes, HL 0.18 mm, HW 0.18 mm; vertex and frons confluent, together subtrapezoidal and moderately transverse; supraantennal tubercles indistinct; compound eyes large, strongly convex, bean-shaped; tempora slightly longer than eyes. Punctures on frons and vertex ( Fig. 138 ) fine and unremarkable, separated by spaces 3–4 × as wide as diameters of punctures; setae ( Fig. 138 ) sparse, short and suberect. Antennae ( Figs 135–138 ) much shorter than half BL, AnL 0.36 mm, antennal club relatively well demarcated; antennomeres I–II strongly elongate, III–VI seems to be slightly elongate, VII about as long as broad, VIII–X transverse, XI much shorter than IX–X combined, about 1.3 × as long as broad, with rounded apex.

Pronotum ( Figs 136, 138 ) elongate, broadest site not possible to define; PL 0.23 mm, PW 0.20 mm; punctures on disc ( Fig. 138 ) small but distinct, separated by spaces 3–4 × as wide as diameters of punctures; setae ( Fig. 138 ) short and sparse, nearly recumbent.

Elytra ( Figs 136–138 ) elongate oval, strongly convex, broadest in front of middle, EL 0.53 mm, EW 0.35 mm, EI 1.50; punctures and setae on elytra poorly visible.

Legs ( Figs 135–138 ) moderately long, slender, unmodified.

Remarks. This specimen has the antennae similarly short (in relation to BL) to specimen 3, but the beetle is preserved with its head and pronotum strongly tilted ventrally, and detailed comparisons were not possible. It may be conspecific with Rovnoscydmus specimens 5, 8 and? Rovnoscydmus specimen 1, as they were all found in one piece of amber.

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 135 – 138. Rovnoscydmus sp. specimen 4 (K- 8970). Ventrolateral (135, 137) and dorsolateral (136, 138) views. Abbreviations: abg, antebasal groove; bef, basal elytral fovea; hw, hind wing; hy, hypomeron; hyr, hypomeral ridge; lbr, labrum; mcp, mesocoxal projection; md, mandible; mtvp, metaventral intercoxal process; mxp 3 – 4, maxillary palpomere III – IV; nr, ' neck' region; st 3 – 8, abdominal sternite III – VIII; tm, temple; v 3, metaventrite.