Ammonites are extinct shelled cephalopods. All had a chambered shell that allowed them to be bouyant. There are three families of cephalopods; coleoids, nautiloids, and ammonites. Their shells would make one think they would be closely related to nautiloids, but in actuality they are closer releated to coleoids (which contain squid and octopus.) Ammonites were born with tiny shells. As the ammonite grew in size, it would build new chambers upon its shell. Once this was done, they’d “block” up the previous chamber that had been outgrown and move into their new, spacier chamber. There have been no reported fossilized ammonite arms, only the shells have been found!

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