A review of sixteen ammonoid specimens of the Berriasian and Valanginian age from
Zacatecas, as recorded by Burckhardt in 1906, is presented as part of a larger-scale study of …

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 …

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 …

Reconstructing the physiology of extinct organisms is key to understanding mechanisms of
selective extinction during biotic crises. Soft tissues of extinct organisms are rarely preserved …

A major goal in evolutionary biology is to characterize and understand the patterns and
processes that shape the evolutionary trajectory of clades through time and space. One …

Body-size distributions of organisms across environments in space and time are a powerful
source of information on ecological and evolutionary processes. However, most studies only …

ABSTRACT During the Early to Middle Devonian, southwestern Gondwana was
characterized by circumpolar marine environments with striking phases of increased …

Assessing the taxonomic importance of the suture line in shelled cephalopods is a key to
better understanding the diversity of this group in Earth history. Because fossils are subject …

Based on data derived from computed tomography, we demonstrate that integrating 2D and
3D morphological data from ammonoid shells represents an important new approach for …

Early late Viséan ammonoid assemblages in Morocco are composed of diverse and well-
preserved specimens. The material was found in a plain in the Tafilalt (eastern Anti-Atlas) …