Fossils Explained: Rudists
Hippuritaceans, colloquially known as rudists, are an extinct group that encompasses some of the most specialized and successful bivalved molluscs that have ever lived. These were sessile marine organisms that dominated tropical shallow waters during
The "robust" australopiths are a group of hominins with large cheek teeth and strongly built jaws that lived alongside the earliest members of our own genus, Homo, approximately 2.5-1.4 million years ago. Why they ultimately went extinct while we set off to conquer the world is still a mystery.
Ammonites were largely pelagic (dwellers of the open ocean) and typically spiral-shelled, of diameter 0.01–2 meters (0.4in–6.6ft), though helical shells have been found. They first appeared about 415 million years ago in the Paleozoic era as small straight-shelled creatures called bacrites, then quickly evolved into a variety of shapes and sizes. Labeled diagram of an ammonite