noun
a taxonomic group comprising animals that lack a cranium or skull, such as hagfishes and lampreys
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Acraniata is a subphylum of animals that lack a distinct skull.
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I learned in biology class that acraniata are animals without a skull.
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Those acraniata critters don't have a head bone.
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In the business world, being an acraniata can represent someone who lacks leadership skills.