A revision and addition to Zopheridae (Coleoptera: Tenebrionoidea) in Baltic amber: possible connections between modern Holarctic distributions and Eocene ‘ amber forests’ Author Alekseev, Vitalii Immanuel Kant Baltic Federal University, Nevskogo 14, Kaliningrad 236016, Russia. & Royal Saskatchewan Museum, 2445 Albert St., Regina, SK, S 4 P 4 W 7, Canada. & Biology Department, University of Regina, Regina, SK, S 4 S 0 A 2, Canada; & Department of Ecology & Evolutionary Biology, University of Kansas, Lawrence, Kansas, 66045, USA; Author Bukejs, Andris Institute of Life Sciences and Technologies, Daugavpils University, Vienības 13, Daugavpils LV- 5401, Latvia. text Zootaxa 2024 2024-11-04 5536 2 201 247 http://dx.doi.org/10.11646/zootaxa.5536.2.1 journal article 10.11646/zootaxa.5536.2.1 1175-5326 14033618 5F1FBB59-9C69-4E66-9B0D-69A015F30EAA Genus Helioctamenus Schauffuss, 1882 Type species: Helioctamenus hippopotamus Schaufuss, 1882 Taxonomic assignment. The specimen under consideration belongs to the tribe Sarrotriini based on the combination of the following characters: (1) dorsally concealed antennal insertions; (2) antennae setose, 10- or 11-segmented, without distinctly separated antennal club; (3) antennal insertions distant from eyes; (4) procoxal cavities open posteriorly; (5) all tarsi tetramerous, not dilated; (6) prosternal process wide, emarginate apically; and (7) metacoxae separated by intercoxal abdominal process with rounded apex. The tribe includes three genera from the Western Palearctic: monotypic Diplagia Reitter, 1882 ; Orthocerus Latreille, 1796 with two European species; and comparatively diverse Helioctamenus ( Ślipiński & Schuh 2008 ) . The new extinct species is assigned to the genus Helioctamenus based on: antennae sparsely and shortly setose (in contrast to Diplagia and Orthocerus ), not fusiform (in contrast to Orthocerus ); interfacetal setae absent; body sparsely setose dorsally; and pronotum distinctly narrower than elytral base (in contrast to Diplagia ).