Cephalochordata
Cephalochordata is a subphylum of small, fish-like marine organisms that lack a backbone. These creatures, also known as lancelets, have a notochord that runs the length of their body, serving as a flexible support structure. Cephalochordates are filter feeders, using cilia to draw in food particles from the water. They are characterized by their simple, elongated body shape and translucent appearance.