Hexadactylus

Monniot, C. (2001). Ascidiacea & Sorberacea. <em>In: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels.</em> 50: pp. 352-355.

Monniot, C.; Monniot, F. (1990). Revision of the class Sorberacea (benthic tunicates) with descriptions of seven new species. <em>Zool. J. Linn. Soc.</em> 99(3): 239-290.

Neave, S.A. (1939 - 1996). Nomenclator Zoologicus. vol. 1-10 Online.