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 ...

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 ...

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 ...

A few weeks ago, during a trip to the Scripps Institution of Oceanography’s Birch Aquarium, I bumped into a nautilus. More or less. Admittedly there was an aquarium pane and many gallons of water ...

Everybody knows how oysters make pearls-- a bit of sand or grit slips through the protective barrier of their outer shell, irritating the mollusk's body, and the invertebrate encircles the invader ...

Although ammonoids died out around the same time as most dinosaurs, new computer models are revealing how these marine animals moved through the water. Nobu Tamura via Wikicommons under CC BY 3.0 ...

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 ...

Everybody knows how oysters make pearls — a bit of sand or grit slips through the protective barrier of their outer shell, irritating the mollusk’s body, and the invertebrate encircles the invader ...