(Phys.org)—A study of around 100 newly collected specimens of early ammonoids (marine invertebrates with distinctive coiled shells) suggests that the number of species they belong to might have been ...

THE early stages of the ammonoid species listed in Table 1 have been studied with the aid of the scanning electron microscope. They reveal the ontogenetic development of the structures present in the ...

Researchers previously focused on the roles of these complex structures in resisting pressure on the shell, but new researchers provide evidence for a different hypothesis. Complex sutures, they found ...

Ammonoids, ancestors of today's octopus, squid and cuttlefish, bobbed and jetted their way through the oceans for around 340 million years beginning long before the age of the dinosaurs. If you look ...