A group or classification of vertebrate animals that lack an amnion, including fish and some amphibians.
From Latin anamniata (plural), from Greek an- 'without' + amnion. The -ata suffix is a common Latin plural ending used in scientific taxonomy for grouping organisms.
Anamniata represents an older classification system that's gradually being replaced by genetic classifications—but the terms stick around in biology texts, showing how science revises its vocabulary as technology improves.
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