Patagomaia is an extinct mammal of uncertain affinities, originally described as a therian mammal, from the Maastrichtian Chorrillo Formation of Argentina. It is the largest Mesozoic mammal yet known, with weight estimates of around . The genus contains a single species, Patagomaia chainko, known from various fragmentary bones.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).