Eustrophus Illiger, 1802

Alekseev, Vitalii I. & Bukejs, Andris, 2022, Eustrophus praecursor sp. nov.: the first Eocene species of Eustrophinae (Coleoptera: Tetratomidae) from Baltic amber, Zootaxa 5165 (3), pp. 435-442 : 436

Genus Eustrophus Illiger, 1802

Type species: Mycetophagus dermestoides Fabricius, 1792

Remarks. The fossil specimen under consideration is placed in Tetratomidae based on simple and narrow tarsi of all legs; procoxae separated by prostenal process; simple metacoxae; and rather short apical spurs of metatibiae. Morphological characters of this inclusion attribute it to Eustrophinae (each elytron with ten complete striae of punctures; antennae with gradually widened distal antennomeres, without abrupt antennal club; metanepistenum distinctly subdivided in two parts; pronotum with paired weak subbasal impressions) and namely to Eustrophini (eyes widely separated; outer surfaces of meso- and metatibiae with numerous oblique, comb-like ridges). A new extinct species is assigned to the genus Eustrophus based on the combination of the following characters: elytra striate-punctate; prothoracic episterna without transverse suture; posterior margin of pronotum with weak lobe; and prosternal process not extending to posterior margin of procoxae. The shape of annular antennal sensilla (present around entire circumference of antennomeres or interrupted) is unclear in the studied specimen.