Comparison of the tarsometatarsi of hesperornithiforms in dorsal view (left-to-right: <i>Fumicollis hoffmani</i> UNSM 20030; <i>Parahesperornis alexi</i> KUVP 2287; <i>Hesperornis regalis</i> YPM 1200; <i>Baptornis advenus</i> AMNH 5101; <i>Brodavis varneri</i> SDSM 68430).

A, proximal view, shape of the proximal articular surface, with arrows indicating the widths and orientations of the medial and lateral cotylae. B, dorsal view, shape and orientation of the intercotylar eminence (arrow). Insets are shown scaled to be of similar size to F. hoffmani. Abbreviations: ie, intercotylar eminence; lc, lateral cotyla; mc, medial cotyla.