A member of the Acrita group; a simple organism lacking a true brain or differentiated nervous system.
From Acrita + '-an' (suffix denoting membership in a group), following the pattern of biological nomenclature to describe individual organisms within the Acrita classification.
This word is rarely used today because modern genetics revealed that 'Acrita' was actually grouping together completely unrelated creatures—it's a humbling example of how life stubbornly refuses to fit into neat boxes.
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