Chordates and vertebrates are related groups within the animal kingdom, but they have some key differences:
Chordates:
Chordates are defined by the presence of a notochord at some stage of their development. The notochord is a flexible rod-like structure that provides support.
They also have a dorsal hollow nerve cord, which is a precursor to the spinal cord in vertebrates.
Chordates possess pharyngeal slits or pouches, which may function in filter feeding, respiration, or communication, depending on the species.
They have a post-anal tail, which is an extension beyond the anus.
Vertebrates:
Vertebrates are a subgroup of chordates that have a vertebral column, or backbone, made up of vertebrae. This feature provides structural support and protection for the spinal cord.
They typically have a well-developed brain enclosed within a skull.
Vertebrates have paired appendages (such as limbs or fins) in many cases.
Most vertebrates have a closed circulatory system, with a heart that pumps blood through a network of vessels.
In summary, all vertebrates are chordates, but not all chordates are vertebrates. Vertebrates are distinguished by the presence of a vertebral column, among other traits, whereas chordates share a set of characteristics including a notochord, dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.