Introduced species seem to rapidly adapt to non-native conditions although founder events may decrease genetic variance and impede adaptation. Cryptic introductions of an invader from different parts of its native range may allow colonization of habitat patches with compatible conditions, or admixture may restore genetic diversity lost during invasion bottlenecks. We present the first genetic study of global invasion pathways for the Asian date mussel, Musculista senhousia, comparing three putative source populations from Asia with six US estuaries and one invaded site in New Zealand and the Mediterranean Sea, totaling 117 individuals. Distribution of mitochondrial DNA and alleles of a nuclear intron revealed two genetically divergent populations in the native range. A warm-water lineage from Tokyo

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