Euconnus

Jałoszyński, Paweł & Perkovsky, Evgeny, 2016, Diversity of Scydmaeninae (Coleoptera: Staphylinidae) in Upper Eocene Rovno amber, Zootaxa 4157 (1), pp. 1-85 : 60

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.5681822
persistent identifier	https://treatment.plazi.org/id/03A187A9-2902-FFCA-FF03-C6E49EA2F825
treatment provided by	Plazi
scientific name	Euconnus
status

Treatment

Euconnus (incertae sedis) sp. 1

( Figs 26 View FIGURES 21 – 34 , 182–188 View FIGURES 182 – 185 View FIGURES 186 – 188 )

Material studied. Late Eocene of Europe , Rovno amber: sex unknown; inclusion in elongate, rectangular prism of amber 11.5 mm long ( Fig. 26 View FIGURES 21 – 34 ), collection number K-9126 ( SIZK).

Description. Body ( Figs 182–188 View FIGURES 182 – 185 View FIGURES 186 – 188 ) elongate, relatively stout and strongly convex, dark brown; BL 1.50 mm.

Head ( Figs 182–188 View FIGURES 182 – 185 View FIGURES 186 – 188 ) broadest at eyes, HL 0.33 mm, HW 0.35 mm; shape of vertex and frons difficult to assess; tempora seem shorter than eyes. Punctures on frons and vertex ( Figs 186–187 View FIGURES 186 – 188 ) fine, separated by spaces 3– 4 × as wide as diameters of punctures; setae ( Figs 186–187 View FIGURES 186 – 188 ) sparse, short, suberect. Antennae ( Figs 182–188 View FIGURES 182 – 185 View FIGURES 186 – 188 ) much shorter than half BL, AnL 0.55 mm, shapes of antennomeres difficult to assess, but antennae seem to be gradually thickened distally and compactly assembled, with at least some of flagellomeres transverse.

Pronotum ( Figs 182 View FIGURES 182 – 185 , 186 View FIGURES 186 – 188 ) slightly broader than long, broadest site difficult to define, but most likely in front of middle; PL 0.35 mm, PW 0.38 mm; anterior margin arcuate; posterior margin shallowly bisinuate, shapes of pronotal corners and lateral margins difficult to assess; base of pronotum with short but distinct sublateral carinae ( Fig. 186 View FIGURES 186 – 188 ; slc) and one (inner) pair of antebasal pits ( Fig. 186 View FIGURES 186 – 188 ; abp). Punctures on pronotal disc ( Fig. 186 View FIGURES 186 – 188 ) small but distinct, separated by spaces 3–4 × as wide as diameters of punctures; setae ( Fig. 186 View FIGURES 186 – 188 ) short, sparse, suberect; sides of pronotum with thick bristles ( Figs 186–188 View FIGURES 186 – 188 ).

Elytra ( Figs 182, 184–186, 188 View FIGURES 182 – 185 View FIGURES 186 – 188 ) elongate oval, strongly convex, broadest anterior to middle, EL 0.83 mm, EW 0.60 mm, EI 1.38; punctures and setae similar to those on pronotum but slightly sparser ( Fig. 186 View FIGURES 186 – 188 ). Scutellum not visible between elytral bases.

Legs ( Figs 183 View FIGURES 182 – 185 , 187–188 View FIGURES 186 – 188 ) moderately long, slender, unmodified.

Remarks. This species can be placed in Euconnus on the basis of the carinate and elevated mesoventral intercoxal process ( Fig. 187 View FIGURES 186 – 188 ; msvp) the metaventral intercoxal process ( Fig. 187 View FIGURES 186 – 188 ; mtvp) short and very broad, broadly separating metacoxae, the scutellum not exposed between elytral bases ( Fig. 186 View FIGURES 186 – 188 ), the subtriangular inner (adcoxal) part of prothoracic hypomeron ( Fig. 187 View FIGURES 186 – 188 ; hy) demarcated laterally by complete hypomeral ridge ( Fig. 187 View FIGURES 186 – 188 ; hyr), and two basal elytral foveae ( Fig. 186 View FIGURES 186 – 188 ; bef) on each elytron. Additionally, the lateral bristles on the pronotum and sublateral pronotal carinae ( Fig. 186 View FIGURES 186 – 188 ; slc) accompanied by small antebasal pits ( Fig. 186 View FIGURES 186 – 188 ; abp) can be found in many extant species of Euconnus , but these characters are not restricted to this genus. This fossil does not show any conspicuous characters that could be used to reliably define a new species; also it was not possible to determine whether this species belongs to any of the extant subgenera or not.