Affinities and Systemic Position of Urochordata

The systemic status of urochordata has long remained controversial.
The systematic status of Urochordata had long remained controversial.​
Lamarck (1816) first called them Tunicata.​
Cuvier (1817) classified them along with Mollusca, but Lamarck put them between Radiata and Vermes.​
Milne Edwards (1843) established the class Molluscoidea to include Bryozoa with Tunicata. ​
However, Kowalevsky (1886) put an end to the controversy when he described the development of a simple ascidian and established their chordate nature Since then, the urochordates have been placed ​as a class or subphylum under the phylum Chordata with certainty.​

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