For the Asian green mussel, see Perna viridis.

Arcuatula senhousia (= Musculista senhousia), commonly known as the Asian date mussel, Asian mussel, or bag mussel, is a small saltwater mussel, a marine bivalve mollusk species in the family Mytilidae, the mussels. Other common names for this species include the Japanese mussel, Senhouse's mussel, the green mussel (a name also applied to Perna viridis), and the green bagmussel. It is harvested for human consumption in China.

This mussel is native to the Pacific Ocean from Siberia to Singapore, but it has also been accidentally introduced and become an invasive species in numerous other areas worldwide. It can live in the intertidal or shallow subtidal zones. In California, the species has been recorded in densities of up to 150,000 individuals per square meter. It grows quickly and lives only about two years. It prefers soft substrates and surrounds its shell in a dense mass of byssus. One of several negative impacts of this invasive species is that it has a detrimental effect on eelgrass.

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