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The most extensively studied cephalochordate type and also the best known example is Branchiostoma( Amphioxus). It is commonly called lancelet or lancet.
Branchiostoma with about 9 species is almost cosmopolitan. The species found in Indian sea are B. indicum, B. pelagecum, B. ceribbaeum, B. lanceolatum.
Branchiostoma is an marine animal commonly found in shallow waters,preferably brakish or salt water, on the sandy coasts. It is a typical ciliary feeder. it feed on planktonic micro-organisms brought along with a respiratory cum food water current. male and female individuals are separate. fertilization takes place in water and development is indirect.