Molluscs comprise the second largest phylum of animals (after arthropods), occurring in
virtually all habitats. Some are commercially important, a few are pests and some carry …

A review of fossil evidence supports a pelagic mode of life (in the water column) of
ammonoids, but they may have spent their life close to the seabottom (demersal) …

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 …

Traditional analyses of Early Phanerozoic marine diversity at the genus level show an
explosive radiation of marine life until the Late Ordovician, followed by a phase of erratic …

Abstract The 'Great Ordovician Biodiversification Event'comprises the rapid diversification of
marine organisms during the Ordovician Period. It is now clear that this adaptive radiation …

The current knowledge about the ammonoid/habitat relation is reviewed and in part newly
interpreted. The autecology of ammonoids, such as ontogeny and habitat, based on …

Externally shelled cephalopods with coiled, planispiral conchs were ecologically successful
for hundreds of millions of years. These animals displayed remarkable morphological …

Most ammonoids display a distinctly different morphology when they are adults or subadults.
Depending on the taxon, these mature modifications may comprise changes in coiling …

Abstract During the Devonian Nekton Revolution, ammonoids show a progressive coiling of
their shell just like many other pelagic mollusk groups. These now extinct, externally shelled …

During the Palaeozoic, a diversification in modes of life occurred that included a wide range
of predators. Major macroecological events include the Cambrian Explosion (including the …