Ammonoids are extinct spiral shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living coleoids than they are to ...
Ammonites
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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
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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 ...
Heteromorph ammonite Aegocrioceras raricostatum from the Cretaceous of Germany. This species has an open coil. Aegocrioceras raricostatum from the Cretaceous of ...
ammonoid, any of a group of extinct cephalopods (of the phylum Mollusca), forms related to the modern pearly nautilus (Nautilus), that are frequently found ...
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 ...
Ammonoidea by Dr. Neale Monks. Ammonoids are a group of externally-shelled cephalopods probably more closely related to the coleoids than to the nautilus.
Phylum Mollusca Class Cephalopoda – Subclass Ammonoidea. The phylum Mollusca includes the familiar classes Gastropoda (snails),. Pelecypoda (clams, oysters ...
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The Ammonoidea: The Evolution, Classification, Mode of Life, and Geological Usefulness of a Major Fossil Group (SYSTEMATICS ASSOCIATION SPECIAL VOLUME).