A mollusc of a group of mainly extinct marine molluscs which includes the pearly nautilus.
- Ammonoids are descendants of the extinct, primitive coiled nautiloids and they are extinct relatives of modern squid, octopus, cuttlefish, and nautilus.
- Other fossil groups include diverse rugose corals, some tabulate corals, nautiloids, gastropods, and trilobites.
- Coiled shells, commonly of ammonoid cephalopods, nautiloids, or gastropods, have been given colloquial names such as rams' horns, snakestones, serpentstones, and conger eels.
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