All chordates share some structures during at least some stage of their development. These are the notochord, nerve cord, pharyngeal slits, and tail.
What are chordates?
When talking about chordates we are referring to the chordate phylum. Individuals composing this group share four main structures,
The notochord is a dorsal spine precursor from which the nervous system gets formed.
The notochord is present during the whole individual's life (like some tunicates) or during only the embryonary period (like vertebrates).
The nerve cord is dorsally located, together with the notochord.
It is hollow, and, during embryogenesis, it might differentiate into a brain.
This cord connects external stimuli to the motor system to react to them.
Present only during a period of the embryonary stage. These slits give rise to different organs and structures like tonsils, ears, or gills.
All chordates have a tail in at least a period of the organism's development.
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