Its fossils have been found in Asia, Europe, North and South America.

Placenticeras, named by Fielding Bradford Meek, 1870, is the type genus for the Placenticeratidae, a family that is part of the Hoplitoidea, a superfamily of the Ammonitida.

Placenticeras has a very involute shell with slightly convex sides and a very narrow venter.

Earlier whorls normally have lower and fine upper ventrolateral clavi.

The suture is with numerous adventitious and auxiliary elements, with saddles and lobes that are much frilled.