These animals are characterized by the development of a notochord for axial support throughout its life. They have a structure that is somewhere between and worm and fish. The animal has a few features in common with the vertebrates. They have a hollow nerve chord, and tail, and similar muscle structure. However, they lack a true brain and complex sensory organs. It feeds using a sort of filter feeding by secreting mucus over its gill slits. They have a simple tube structure for a digestive system. They also lack a respiratory and circulation systems.
These creatures are good for studying evolution and perhaps understanding the "missing link" that was between vertebrates and invertebrates.
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