Subphylum Urochordata
Subphylum Urochordata (4 classes, +8 orders, +25 families, 2000 species)
Tunicates
- Class Appendicularia (1 order, 3 families, 12 genera, 50 species)
Free Swimming Tunicates
Appendicularian
- Class Ascidiaceae (3 orders, 19 families, +90 genera, +377 species)
Sea Squirts
Pyrosoma
- Class Sorberacea (1 order, 1 family, 3 genera, 6 species)
Benthic Tunicates
Tunicate
- Class Thaliacea (3 orders, 3 families, 19 genera, 35 species)
Salp
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