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as thaliaceans are excluded)
*** Class Thaliacea (salps, doliolids and pyrosomes)
*** Class Appendicularia (larvaceans)
** Subphylum Vertebrata (Craniata) (vertebrates - animals with backbones; 66,100+ species)
*** Infraphylum "Agnatha" paraphyletic (jawless vertebrates; 100+ species)
**** Superclass Cyclostomata

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