Amphioxus

The amphioxus are members of the invertebrate subphylum Cephalochordata of the phylum Chordata. they are small, fish-like creatures. generally less that 3 inches in length.  They are not particularly good swimmers though. Although they have no defined head and no eyes, they are closely related to vertebrates. They feed off of food particles in the water

They are generally found in the mud, sand, or gravel at the bottom of the ocean. They are found in access off the coast of China. They are also commercially fished. Below is a diagram of an amphioxus.