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 …

Palaeontologists have long sought to explain the diversification of individual clades to whole
biotas at global scales. Advances in our understanding of the spatial distribution of the fossil …

An ammonite zonation of the Cretaceous period is presented, which largely follows the
Geological Time Scale 2012, with illustrations of several index species. Concepts of …

Based on associated and three-dimensionally preserved cranial and postcranial remains, a
new thalattosuchian crocodyliform, Magyarosuchus fitosi gen. et sp. nov. from the Lower …

Because ammonoids have never been observed swimming, there is no alternative to
seeking indirect indications of the locomotory abilities of ammonoids. This approach is …

The taphonomic mechanisms of a mono-to pauci-specific ammonoid fauna comprising 3565
specimens from the lower Carnian Polzberg Konservat-Lagerstätte near Lunz am See …

A great number of new studies have been carried out on ammonoid embryonic development
in the last two decades. We focus here on novel developments and interpretations in the …

Scaphitid ammonoids were ubiquitous and significant components of the Western Interior
Seaway during the Late Cretaceous. This group is characterized by a recurved hook at …

Ammonites are often dominant elements of Early Cretaceous marine faunas. Many species
are important index fossils, in some cases with worldwide distribution. We review the …

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 …