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 …

Phenotypic plasticity, the ability of an individual organism to express different phenotypes in
response to varying environmental conditions, is ubiquitous across life's diversity. It is also …

Fossiliferous carbonate concretions are commonly found in sediments deposited in the Late
Cretaceous Western Interior Seaway. Although concretions are diagenetic features, well …

An iconic member of the Ediacara Biota, Dickinsonia Sprigg is one of few such taxa with
multiple species. Here we use Gaussian finite mixture models to assess the validity of …

Scaphitids rank among the commonest and best‐known Late Cretaceous ammonites, yet
many aspects of their palaeobiology are still unresolved. Here, natural moulds and co …

Predator–prey relationships are considered a major driver for the evolution of organisms,
and thus contributed to sha** morphology, ecology, and diversity. During the Late …

Analyses of δ 18 O and δ 13 C of original shells of late Valanginian (verrucosum to
triptychoides ammonite zones) ammonites preserved in clay at localities in central Poland …

The ontogeny-induced intraspecific variability of ammonite shells produce significant
morphologic changes, and therefore, should be carefully considered in taxonomic …

Taxonomic status of several members of the family Naticidae is extremely vague because of
its simple shell morphology. Conventional taxonomic classification schemes suggest that …

We examine temporal and spatial variation in morphology of the ammonoid cephalopod
Discoscaphites iris using a large dataset from multiple localities in the Late Cretaceous …