Species of lancelet
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Branchiostoma japonicum, the Japanese lancelet, is a species of lancelet within the family Branchiostomatidae. The species grows to lengths of 50 to 60 millimeters in length and inhabits waters off the coasts of China and Japan. In Xiamen, the lancelets inhabiting the waters were originally thought to be of "Branchiostoma belcheri" in 1932, however recent studies revealed "B. japonicum" is also present in the lancelet populations.