basis of recordGosliner T.M. 2004. Phylogenetic systematics of <i>Okenia, Sakishimaia, Hopkinsiella</i> and <i>Hopkinsia</i> (Nudibranchia: Goniodorididae) with descriptions of new species from the tropical Indo-Pacific. <i>Proceedings of the California Academy of Sciences</i>, (4) 55(5): 125-161, available online athttp://researcharchive.calacademy.org/research/scipubs/pdfs/v55/proccas_v55_n05.pdf[details]