Relating to or characteristic of acanthodea, the group of ancient spiny-finned fish from the Paleozoic era.
From 'acanthodea' + '-an' (adjectival suffix), directly describing something that belongs to or relates to the acanthodea group.
When paleontologists found fossils of these creatures, the spines were so prominent that they named the entire group based on this feature—sometimes one dramatic characteristic tells the whole story!
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