This is a rare & beautiful fossil of Nostoceras Malagasyense heteromorph ammonite from Madagascar. Unlike most ammonites that are tightly wrapped, like a spiral shell that holds its shape throughout its whole life, the heteromorph ammonites may have coiled or uncoiled shells.These heteromorph ammonites are from the late Cretaceous (Campanian stage) or about 70 million years ago.
Ammonites are an extinct group of marine invertebrate in the subclass Ammonoidea of the class Cephalopoda. The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams horns. These molluscs are more closely related to living coleoids (i.e. octopus, squid and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest Ammonites appear during the mid Devonian age roughly 350 million years ago, and the last species died out during the Cretaceous-Paleogene extinction event 66 million years ago
Size: 80 x 80 x 45mm