What animal exhibits all four chordate features an adult?

The adult tunicate, specifically the subphylum Urochordata, exhibits all four chordate features: a notochord, dorsal nerve cord, pharyngeal slits, and post-anal tail. While tunicates are more commonly recognized in their larval stage, which displays these features prominently, certain adult tunicate forms retain these characteristics in a reduced or modified state. For example, they have a notochord in their larval stage, and some adult forms retain remnants of the nerve cord and pharyngeal slits for filter feeding. Thus, while tunicates are unique among chordates, they do reflect the chordate features in their life cycle.