Rovnoscydmus

Jałoszyński, Paweł & Perkovsky, Evgeny, 2016, Diversity of Scydmaeninae (Coleoptera: Staphylinidae) in Upper Eocene Rovno amber, Zootaxa 4157 (1), pp. 1-85 : 48-51

publication ID	https://doi.org/ 10.11646/zootaxa.4157.1.1
publication LSID	lsid:zoobank.org:pub:6BF4514A-892F-499F-BC1E-B7920C7A00B0
DOI	https://doi.org/10.5281/zenodo.5681794
persistent identifier	https://treatment.plazi.org/id/03A187A9-2916-FFC3-FF03-C0739F59FE01
treatment provided by	Plazi
scientific name	Rovnoscydmus
status	gen. nov.

Treatment

† Rovnoscydmus View in CoL sp. specimen 6

( Figs 19 View FIGURES 1 – 20 , 145–150 View FIGURES 145 – 150 )

Material studied. Late Eocene of Europe , Rovno amber: sex unknown; inclusion in elongate, triangular (with one corner rounded) prism of amber 17 mm long ( Fig. 19 View FIGURES 1 – 20 ), collection number K-7350 ( SIZK).

Description. Body ( Figs 145–150 View FIGURES 145 – 150 ) elongate, slender, nearly black; BL 1.10 mm.

Head ( Figs 145–150 View FIGURES 145 – 150 ) broadest at eyes, HL about 0.25 mm, HW 0.28 mm; vertex and frons confluent, together subtrapezoidal and moderately transverse; supraantennal tubercles indistinct; compound eyes large, strongly convex, oval; tempora seem to be longer than eyes. Punctures on frons and vertex ( Fig. 148 View FIGURES 145 – 150 ) fine and unremarkable, separated by spaces 3–4 × as wide as diameters of punctures; setae ( Fig. 148 View FIGURES 145 – 150 ) sparse, short and suberect. Antennae ( Figs 145–150 View FIGURES 145 – 150 ) much shorter than half BL, AnL about 0.40 mm, antennal club relatively well demarcated; antennomeres I–II strongly elongate, shapes of flagellomeres difficult to assess.

Pronotum ( Figs 145–150 View FIGURES 145 – 150 ) nearly inversely trapezoidal, broadest near anterior fourth; PL 0.30 mm, PW 0.30 mm; punctures on disc ( Fig. 148 View FIGURES 145 – 150 ) small but distinct, separated by spaces 2–4 × as wide as diameters of punctures; setae ( Fig. 148 View FIGURES 145 – 150 ) short and sparse, suberect, on sides of pronotum replaced by distinct thick bristles ( Figs 145, 148 View FIGURES 145 – 150 ).

Elytra ( Figs 145–150 View FIGURES 145 – 150 ) elongate oval, broadest distinctly in front of middle, EL 0.55 mm, EW 0.45 mm, EI 1.22; punctures and setae similar to those on pronotum ( Fig. 148 View FIGURES 145 – 150 ).

Legs ( Figs 145–146, 148–149 View FIGURES 145 – 150 ) moderately long, slender, unmodified.

Remarks. Although this specimen is preserved in cloudy amber and only dorsal structures are partially exposed, the antennal structure, the shape of head, the elytra with one basal fovea each and measurements strongly suggest that this is also a Rovnoscydmus . The state of preservation does not allow for detailed comparisons, but this specimen is valuable because of the thick bristles visible on the right temple. Even in extant species of Glandulariini the bristles on the head and sides of prothorax may be difficult to observe under light microscopes, especially when they are short, mixed with 'regular' setae or sparse; sometimes they are partly broken off. The presence of bristles, within Scydmaeninae restricted to certain genera of Glandulariini , is treated as an important character state and whenever possible, it should be illustrated and described in fossils to facilitate further taxonomic or phylogenetic study.