A group of extinct mammals from the Mesozoic Era that had unique teeth and skeletal features distinct from other mammalian groups.
From Greek 'allo-' (other) + 'theria' (beasts/mammals). The term was coined by paleontologists to classify these 'different beasts' whose characteristics didn't fit standard mammalian categories. It reflects 19th-century fossil classification when scientists discovered creatures that challenged existing taxonomic frameworks.
Allotheria is like nature's experiment with a 'Plan B' for mammals—these creatures had such weird tooth arrangements and bones that paleontologists literally named them 'other beasts' because they seemed to break all the mammal rules! Today we know they represent an entirely separate branch of mammal evolution that went extinct.
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