Refer to the image below.What developmental anomaly is demonstrated? 
Definitions:
Tunicate Larvae
The larval stage of tunicates, marine invertebrates, characterized by a notochord and a dorsal nerve cord.
Notochord
Cartilage-like supportive dorsal rod in all chordates at some time in their life cycle; replaced by vertebrae in vertebrates.
Vertebrates
Animals characterized by having a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fish.
Chordates
A large phylum of animals that, at some stage in their development, possess a notochord, a hollow dorsal nerve cord, and pharyngeal slits, including vertebrates like fishes, amphibians, reptiles, birds, and mammals.
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