Kott, P., 2002, A complex didemnid ascidian from Whangamata, New Zealand: Journal of Marine Biology Association of the United Kingdom, v. 82, no. 4, p. 625-628. [description of Didemnum vexillum] (PDF format)
Kott, P., 2004, A new species of Didemnum (Ascidiacea, Tunicata) from the Atlantic coast of North America: Zootaxa, v. 732, p. 1-10. [description of Didemnum vestum and comparison with D. vexillum and D. lahillei] (PDF format)