Oiceoptoma Leach, 1815

Oiceoptoma Leach, 1815: 89 (type species Silpha thoracica Linnaeus, 1758, by monotypy).

Oeceoptoma: Agassiz 1847: 256, 257 (unjustified emendation of Oiceoptoma).

Isosilpha Portevin, 1920: 398 (type species Eusilpha hypocrita Portevin, 1903, by original designation) (synonymy by Peck 2001: 270).

Revised diagnosis. Small to medium-sized species (body length 12.1–16.2 mm) with distinct habitus (Figs. 1A–F, 2A–E, 3A–C; Růžička et al. 2004: 37–38, figs. 10–15), body distinctly dorsoventrally flattened and rounded, orange and/or black in colour. Pronotum exceptionally with yellow to pink lateral margins (Ratcliffe 1996: 36, fig. 36; Růžička et al. 2004: 37, fig. 12) or with four spots on disc, arranged in trapezoidal pattern (Figs. 1A, D, 2E, 3A). Head with short row of long erect setae behind eyes (Fig. 3D), clypeus anteriorly widely notched (Fig. 8D), frons with transverse, elevated crest posteriorly (Figs. 3D, 17C). Antenna medium-sized, with last four antennomeres forming a distinct club (Figs. 7A, C–E). Elytral shoulders with tooth (Fig. 3F). Median lobe of aedeagus rounded or pointed, parameres always longer than median lobe (Figs. 11A–E; Růžička et al. 2004: 35, figs. 1–9).

Distribution. Holarctic Realm.