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Ammonites
Animal
Ammonoids are extinct spiral shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living coleoids than they are to shelled nautiloids. The earliest ammonoids appeared during the Devonian, with the last species... Wikipedia
Lower classifications
Ammonoidea includes a more exclusive group called Ammonitida, also known as the true ammonites. These animals are known from the Jurassic Period, from about 200 ...
Ammonoidea were a group of hard shelled squid-like cephalopods that lived in the Mesozoic era, which included the famous ammonites.
Ammonoids are an extinct group of marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs are more closely related to ...
an order of extinct chiefly Mesozoic Tetrabranchia comprising cephalopods having an external chambered shell that is either straight or variously curved or ...
Phylum Mollusca Class Cephalopoda – Subclass Ammonoidea. The phylum Mollusca includes the familiar classes Gastropoda (snails),. Pelecypoda (clams, oysters ...