Arcuatula 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. One of several negative impacts of this invasive species is that it has a detrimental effect on eelgrass.