Relating to or characteristic of ammonoids or the class Ammonoidea, describing features or traits of these extinct spiral-shelled sea creatures.
From Ammonoidea + -an (a suffix forming adjectives from nouns, indicating 'of or pertaining to'). This combines the scientific taxonomic name with an adjectival suffix to describe properties associated with the group.
When a paleontologist finds a fragment of shell and says 'This has ammonoidean characteristics,' they're using morphology—the shape and structure—to identify something from the distant past. It's detective work using anatomy as evidence!
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