Placenticeras meeki

Placenticeras meeki is an ammonite species from the Late Cretaceous. These cephalopods were fast-moving nektonic carnivores. They mainly lived in the American Interior Basin (Western Interior Seaway).

Description
Shells of this species could reach a diameter of about 1 m. They are discoidal, involute and compressed. Whorls are stout and rounded to diameter of 3 millimeters. The surface of fossils is usually covered by opalized nacre (ammolite).

Etymology
The name honours Fielding Bradford Meek.