Heteromorph Ammonites
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Heteromorph ammonites are special. They are not tightly coiled and/or coil in more than one plane, sometimes multiple planes. Most ammonites are homomorphs and follow a planispiral shell type. This means that they maintain a tight spiral shape throughout their lives. Heteromorphs are different! The coil patterns of their shells are irregular. There are many species of heteromorphs each with its own seemingly wimsical coil pattern. This type of ammonite flourished during the Cretaceous Period.
