They all have a noto cord which supports along the backbone. They all have pharyngeal slits or pouches, though they may be only present in the embryonic stages, as is the case with humans. The subphyla of Chordata include the non-vertebrate chordates and the vertebrate chordates. The non-vertebrate chordates are not very common. They include tunicates and lancelates.
Most chordates are vertebrates.
Vertebrates All vertebrates have a backbone, which is the noto cord surrounded by bone, a skull, and new organs. We studied a boney fish in lab. A swim bladder Another interesting feature of the boney fish is the kidney that runs along its spine. Pictured here, the kidney is the black horizontal line. Amphibia Amphibians originated 400 million years ago probably as fish evolved to walk on land.