Ypresiomymra, Archibald, Cover et Moreau, 2006

Dlussky, G. M., Rasnitsyn, A. P. & Perfilieva, K. S., 2015, The Ants (Hymenoptera: Formicidae) of Bol’shaya Svetlovodnaya (Late Eocene of Sikhote-Alin, Russian Far East), Caucasian Entomological Bulletin 11 (1), pp. 131-152 : 139

Genus Ypresiomyrma Archibald, Cover et Moreau,2006

Type species Ypresiomyrma orbiculata Archibald, Cover et Moreau, 2006 , by original designation.

Diagnosis. Gyne. Large ants (body length more than 15 mm). Waist consisting of 1 segment (petiole). Petiole lacking anterior peduncle; node conical, well developed; attached to 1st gastral segment without notable constriction, length, height subequal. Gaster normal in proportions, not notably slender as in Avitomyrmex Archibald, Cover et Moreau, 2006, without constriction between 1st and 2nd gastral (abdominal III and IV) segments. 1st gastral segment bell-shaped, 0.69–0.96 times as long as 2nd. Mandibles triangular, shorter than head capsule length. Eyes, where known, large, well developed, placed at or anterior to cephalic mid-length. Propodeal dorsum rounded in lateral view, without projections. Forewing with closed cells1+2r, 3r, rm and mcu.

Species included. Ypresiomyrma rebekkae Rust, Andersen, 1999 from Ølst and Fur Formations (Denmark, Eocene, earliest Ypresian) [ Rust, Andersen, 1999], Y. orbiculata Archibald, Cover et Moreau, 2006 , and Y. bartletti Archibald, Cover et Moreau, 2006 from the McAbee locality [ Archibald et al., 2006]; Kamloops Group, unnamed formation; Canada, Eocene, Ypresian and the species described below.