A group of primitive ray-finned fish characterized by ganoid scales (shiny, hard, diamond-shaped scales) and shield-like head features.
From Greek 'aspis' (shield) + 'ganoid' (a type of fish scale) + '-ei' (plural suffix), describing ancient fish with both shield features and specialized scales.
These fish have scales that look like they're coated in enamel—the same material in your teeth—giving them an almost metallic appearance that made them seem invincible in prehistoric seas!
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