Tomosomus, Motschulsky, 1855

Telnov, Dmitry & Gusakov, Alexey A., 2023, Rediscovery of Tomosomus Motschulsky, 1855 (Coleoptera: Anthicidae) with redescription of the genus, a new genus-rank synonym, and a key to species, Zootaxa 5293 (3), pp. 541-556 : 555

Key to species of Tomosomus

Identification of females is not yet possible since females remain unknown for T. meridionalis and T. pallidicornis .

1 Male protibia with obtusely angulated postmedian swelling at posterior margin ( Fig. 3D ); posterior sutural angle of elytra prolonged posteriad, acute angulate in both sexes ( Figs 2C , 3A ); aedeagus apex rounded (in dorsal view).... T. subtestaceus

- Male protibia without swelling; posterior sutural angle of elytra not prolonged, subacute............................. 2

2 Aedeagus irregularly shaped, somewhat twisted, apically bifurcate ( Fig. 9E ); male antennomeres 9–10 transverse; male head base slightly concave....................................................................... T. meridionalis

- Aedeagus regularly rod-like shaped, not twisted, apically rounded (in dorsal view) ( Fig. 7F ); male antennomere 10 transverse; male head base subtruncate.................................................................. T. pallidicornis

Figures

FIGURE 2. Tomosomus subtestaceus Motschulsky, 1855. A—Lectotype ♁, habitus, dorsal view; B—ditto, lateral view; C— Apex of elytra, tergite VII and aedeagus, dorsal view [not to scale]. Images courtesy Kirill V. Makarov (Moscow, Russia).

FIGURE 3. Tomosomus subtestaceus Motschulsky, 1855, ♁ from San Lorenzo NP, Panama.A—Habitus, dorsal view; B—ditto, lateral view; C—ditto, pro-, meso- and metathorax, ventral view; D—Foreleg including procoxa [not to scale].

FIGURE 7. Tomosomus pallidicornis (Champion, 1890), lectotype ♁, terminalia and genitalia.A—Tergite VII, dorsal view; B— Part of a median furrow of tergite VII, dorsal view (enlarged); C—Morphological sternite VII, ventral view; D—Morphological sternite VIII, ventral view; E—Morphological sternite IX; F—Aedeagus, lateral view [not to scale].

FIGURE 9. Tomosomus meridionalis (Champion, 1890), lectotype ♁, terminalia and genitalia.A—TergiteVII, dorsal view; B— Part of a median furrow of tergite VII, dorsal view (enlarged); C—Morphological sternite VII, ventral view; D—Morphological sternites VIII & IX; E—Aedeagus, ventral view [note—aedeagus tip is somewhat damaged]; F—ditto, endophallic armature (enlarged) [not to scale].