Cephalopods are a diverse group of marine invertebrates with complex behaviors and ecological roles. Fossil cephalopods are abundant in strata across hundreds of millions of years of Earth’s history. Many cephalopods have carbonate (CaCO3) structures …
Heteromorphs are ammonoids forming a conch with detached whorls (open coiling) or non-planispiral coiling. Such aberrant forms appeared convergently four times within this extinct group of cephalopods. Since Wiedmann's seminal paper in this journal, …
Nautilus is often used as an analogue for the ecology and behavior of extinct externally shelled cephalopods. Nautilus shell grows quickly, has internal growth banding, and is widely believed to precipitate aragonite in oxygen isotope equilibrium …