An extinct group of early fish-like vertebrates from the Paleozoic era that lacked true jaws and bones.
From Greek 'archaios' meaning 'ancient' combined with 'cranium' meaning 'skull'. These creatures represent early stages in vertebrate evolution before jaws evolved.
Archaecranites were essentially nature's first attempts at building a fish—they're like the prototype versions before the design got refined, lacking jaws so they could only filter-feed and suction up food from the ocean floor.
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