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Ammonoid Paleobiology: From macroevolution to paleogeography
This two-volume work is a testament to the abiding interest and human fascination with ammonites. We offer a new model to explain the morphogenesis of septa and the shell, we explore their habitats by the content of stable isotopes in their shells, we discuss the origin and later evolution of this important clade, and we deliver hypotheses on its demise. The Ammonoidea produced a great number of species that can be used in biostratigraphy and possibly, this is the macrofossil group, which has been used the most for that purpose. Nevertheless, many aspects of their anatomy, mode of life, development or paleobiogeographic distribution are still poorly known. Themes treated are biostratigrap...
The Global Triassic
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Smithian (early Triassic) Ammonoids from Northwestern Guangxi (south China) and Biogeographic Modelling of the Ammonoid Recovery After the Permian-Triassic Mass Extinction
During the Permian-Triassic crisis, more than 90% of marine species disappeared. Until then, the biotic recovery was often considered as very slow. In this context, the Early Triassic ammonoids represent a phylogenetically well constrained and well adapted to the study of the impact of climatic and oceanic conditions on the macroecological post-crisis dynamics. To understand the impacts of these parameters, we have elaborated a 2D model where the temperatures and currents force the geographical dispersal of a randomly generated clade. The fossil data indicate that the ammonoids are one of the first marine organisms to quickly and fully recover. The beginning of the Early Triassic is marked by a very weak latitudinal diversity gradient. A clear latitudinal diversity gradient progressively emerges during the Early Triassic, linked to a maximal latitudinal differentiation and a high level of endemicity of faunas, which entails increased steepness of the SST gradient.
Embryos in Deep Time
Fossils, ontogeny, and phylogeny -- Evo-devo, plasticity, and modules -- Fossilized vertebrate ontogenies -- Bones and teeth under the microscope -- Proportions, growth, and taxonomy -- Growth and diversification patterns -- Fossils and developmental genetics -- "Missing links" and the evolution of development -- Mammalian and human development -- On trilobites, shells, and bugs -- Epilogue : is there a moral to developmental paleontology?
Squid Empire
Before there were mammals on land, there were dinosaurs. And before there were fish in the sea, there were cephalopods-the ancestors of modern squid and Earth's first truly substantial animals. Cephalopods became the first creatures to rise from the seafloor, essentially inventing the act of swimming. With dozens of tentacles and formidable shells, they presided over an undersea empire for millions of years. But when fish evolved jaws, the ocean's former top predator became its most delicious snack. Cephalopods had to step up their game. Many species streamlined their shells and added defensive spines, but these enhancements only provided a brief advantage. Some cephalopods then abandoned th...
