Oiceoptoma Leach, 1815

Sommer, David, Růžička, Jan, Nishikawa, Masaaki & Schneider, Jan, 2021, Oiceoptoma tangi (Coleoptera: Silphidae: Silphinae), a new species of carrion beetle from eastern China, Zootaxa 4949 (3), pp. 445-472 : 447-448

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.

Figures

FIGURE 1. A–F. Habitus of Oiceoptoma tangi Sommer, Růžička, Nishikawa & Schneider, new species: A–C holotype male, D–F paratype female, Pinxi Creek; A, D—dorsal view, B, E—ventral view, C, F—lateral view. Scale 2 mm.

FIGURE 2. A–D. Habitus of Oiceoptoma subrufum (Lewis, 1888): A–C male, D—female. E. Habitus of O. nigropunctatum (Lewis, 1888), female. A, D, E—dorsal view, B—ventral view, C—lateral view. Scale 2 mm.

FIGURE 3. A–C. Habitus of Oiceoptoma nigropunctatum (Lewis, 1888), male. A—dorsal view, B—ventral view, C—lateral view. Scale 2 mm. D–F. Details of O. tangi Sommer, Růžička, Nishikawa & Schneider, new species, male paratype, Pinxi Creek. D—head dorsally, E—head ventrally, F—humerus of elytra in dorsal view.

FIGURE 7. A–C. Antenna of Oiceoptoma in dorsal view.A–C—O. tangi Sommer, Růžička, Nishikawa & Schneider, new species, Pinxi Creek, D—O. subrufum (Lewis, 1888), E—O. nigropunctatum (Lewis, 1888).

FIGURE 8. A, B. Left elytron of Oiceoptoma in ventral view. C. Detail of punctation on elytron of Oiceoptoma in ventral view. D. Head of Oiceoptoma in dorsal view. A, C, D—O. tangi Sommer, Růžička, Nishikawa & Schneider, new species, female paratype, Pinxi Creek. B—O. subrufum (Lewis, 1888). D—O. tangi Sommer, Růžička, Nishikawa & Schneider, new species, male holotype.

FIGURE 11. A–E. Aedeagus of Oiceoptoma. A, B—O. tangi Sommer, Růžička, Nishikawa & Schneider, new species, paratype, Pinxi Creek, ventral and dorsal view. C, D—O. subrufum (Lewis, 1888), ventral and dorsal view. E—O. nigropunctatum (Lewis, 1888), ventral view.

FIGURE 17. A–B. Female abdomen of Oiceoptoma, dorsal and ventral views. C. Head of Oiceoptoma, lateral view. A, B—O. tangi Sommer, Růžička, Nishikawa & Schneider, new species, female paratypes, Pinxi Creek. C—O. tangi Sommer, Růžička, Nishikawa & Schneider, new species, male holotype. ant—antenna, c—coxite, ce—compound eye, cr—crest, s—stylus, t7–9— tergum 7–9, v5–8—ventrite 5–9.