A taxonomic classification for vertebrates lacking an amnion, used as an alternative term to anamniata.
From Greek an- 'without' + amnion + Latin -ata plural suffix. This appears to be an alternate or variant scientific nomenclature, mixing Greek and Latin morphology common in taxonomy.
Scientists sometimes create multiple names for the same group as terminology evolves—looking at 'anamniata' versus 'anamnionata' is like seeing the working notes of how biological classification was developing in real time.
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