FAMOUS BEAUTIES FROM THE USA – 2

Like the specimen in the adjacent display case, this unusual ammonite belongs to the genus Didymoceras. However, it differs in a number of details and is therefore assigned to another, closely related species.

It is quite obvious that with this shape of shell, rapid horizontal movement was out of the question! However, both Didymoceras were probably able to move vertically up and down in the water column by partially flooding and emptying their air chambers.