Orthoceratites & trilobites - Artist's view of an Orthoceras catching a trilobite (Asaphus kowalewskii) in an Ordovician sea 480 million years ago. Orthoceras (Greek straight horn) is a genus of mollusk cephalopod fossil. They returned in large numbers during the Paleozoic and were the main predators. Squid - like Orthoceratites (genus Orthoceras) attempt to make meals of trilobites of the species Asaphus kowalewskii at the bottom of an Ordovician sea 480 million years ago. Also featured is a sea star (AKA starfish), an echinoderm of the class Asteroidea; palm - like Crinoids (AKA sea lilies); Rugosa (AKA Tetracoralla); Favistina stellata coral; and Vauxia sponges.
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