Hamites ammonites lived in the Cretaceous Period. These were heteromorphic animals with uncoiled shells. Some Hamites began life with a very small spiral shell, but typically grew into either a long ...

Yusuke Muramiya and other researchers from the Fukada Geological Institute discovered three ammonite fossils shaped like paper clips and featuring irregular whorls in the town of Nakagawa in 2015 ...