A taxonomic term formerly used to classify mammals that lack a placenta; equivalent to Aplacentalia.
From 'aplacental' plus the Latin suffix '-aria' (denoting a category or group). Used alongside Aplacentalia in 19th-century biological classification systems.
Scientists used both 'Aplacentalia' and 'Aplacentaria' interchangeably—showing how taxonomy was still experimental, with competing naming conventions before genetics unified biology!
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