FIG. 15. — A1-A3 in Antaganides n. gen., a new genus of Middle Jurassic nautiloid, ancestor of Pseudaganides Spath, 1927, with discussion on the phyletic origin of the family Pseudonautilidae

FIG. 15. — A1-A3, Pseudaganides subbiangulatus (d'Orbigny, 1850), specimen 2023.PB.N155, la Crèche, Lower Callovian, Gracilis Zone; B1-B3, Belmonticeras subsinuatum (d'Orbigny, 1850), specimen 2023.PB.N150, Chauray, Lower Bajocian, Laeviuscula Zone; C, Pseudaganides subbiangulatus, specimen 2023. PB.N110, detail of the well preserved and particular aperture, Bougon, Lower Callovian, Gracilis Zone, Patina Subzone, Boginense Horizon. *, end of the phragmocone. Scale bars: 1 cm.