Abbreviations: II–IV, trochlea of metatarsals II–IV. doi:10.1371/journal.pone.0141690.g023 Like all hesperornithiforms, the trochlea of metatarsal II is wedge-shaped and more narrow medio-laterally than trochlea III or IV in dorsal view, and is shifted plantarly behind the trochlea of metatarsal III. In B.
Source: wiktionary