Lancelets

A cephalochordate (from Greek: κεφαλή kephalé, "head" and χορδή khordé, "chord") is an animal in the chordate subphylum, Cephalochordata. They are characterized as chordates, as they possess all 5 characteristics of the chordates, during larval stages and through to adulthood. This includes: notocord, dorsal nerve cord, endostyle, pharynx and post-anal tail. Cephalochordates are represented in the modern oceans by the Amphioxiformes (lancelets, also known as amphioxus). Along with its sister phylum, Urochordata, Cephalochordata can be classified...