 It has increased its range northward, being found for the first time in Chesapeake Bay in 1964.It arrived in the bay because many oysters there were infected by "Haplosporidium nelsoni" and stocks were replenished by importing eastern oysters ("Crassostrea virginica") from the Gulf of Mexico.Accompanying these oysters were some crabs "Eurypanopeus depressus" which were parasitized by "L. panopaei", the parasitic barnacle thus was inadvertently introduced to Chesapeake Bay where it found new species of crab to infect.