The plural form of antiarchus, referring to multiple early prehistoric fish-like creatures with some defensive armor plates.
From Greek 'anti-' (against) + 'archos' (chief or ruler), with the Latin plural ending '-a'. This paleontology term names organisms that lived in early seas but were eventually displaced by other species.
The antiarchas were early relatives of fish that had armor-plating covering their bodies—they dominated the oceans but eventually went extinct, defeated by more advanced fish with skeletons and better mobility.
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