FIG. 13. — A 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. 13. — A, Antaganides cf. erycinus (Tagliarini, 1901), n. comb., specimen 2023.PB.N129, with its preserved muscle scar, Niort, Upper Bajocian, Niortense Zone; B, Antaganides cf. erycinus (Tagliarini, 1901), n. comb.,specimen 2023.PB.N148, with its siphuncle,viaduc de l'Égray, Upper Bajocian,Niortense Zone; C, Pseudaganides crechensis n. sp., specimen 2023.PB.N143, newly hatched shell showing its reticulate ornamentation on the phragmocon; D1-D3, Pseudaganides subbiangulatus (d'Orbigny, 1850),specimen 2023.PB.N110, full grown shell with its well preserved aperture,Bougon,Lower Callovian,Gracilis Zone,Patina Subzone,Boginense Horizon; E1-E3, Pseudaganides subbiangulatus, specimen 2023.PB.N112, Niort,Middle Callovian,Anceps Zone,Stuebeli Subzone.*, end of the phragmocone. Scale bars:1 cm.