P.  Kott, ?The Australian Ascidiacea, Phlebobranchia and Stolidobranchia, supplement?, Memoirs of the Queensland and Museum, vol. 32, no. 2, pp. 267-298, 1990.

A. E.  Verrill, ?Additions to the Tunicata and Molluscoidea of the Bermudas?, Transactions of the Connecticut Academy of Arts and Sciences, vol. 10, pp. 588-594, 1990.

T.  Nishikawa, ?The ascidians of the Japan Sea?, Publications of the Seto Marine Biological Laboratory, vol. 34, pp. 73-148, 1990.

P.  Kott, ?The Australian Ascidiacea Part 2, Aplousobranchia (1)?, Memoires of the Queensland Museum, vol. 29, pp. 1-298, 1990.

C.  Monniot and Monniot, F., ?Revision of the class Sorberacea (benthic tunicates) with descriptions of seven new species?, Zoological Journal of the Linnean Society, vol. 99, pp. 339-390, 1990.