Fig. 3 in The systematic affinities between the Lower Cretaceous Ammonoidea Protacanthoplites abichi (Anthula, 1900) and Acanthohoplites aschiltaensis (Anthula, 1900)

Fig. 3. Illustration of the ontogenetic stages observed after the ammonitella (not seen), including Royerianum (green), Abichi (yellow), Crassicostatum-like (orange), Tobleri (violet), and Aschiltaensis (blue). A. Protacanthoplites abichi (Anthula, 1900), lectotype (IPUW 1900-3a). B. Acanthohoplites aschiltaensis (Anthula, 1900), lectotype (PMU.24105). C. A. aschiltaensis, paralectotype (PMU.24107). D–J. Schematic evolution of the whorl section of the plexus P. abichi – A. aschiltaensis. D–E. After Bogdanova & Mikhailova (2016: fig. 57), not to scale. F. After IPUW 1900-3a, not to scale. G. After paralectotype (PMU.24108), at scale. H–J. After paralectotype (PMU.24107), at scale.