| Reference no. | Description | year | Name used | Page |
|---|---|---|---|---|
| 833 | Ruppert, E.E., R.S. Fox and R.D. Barnes 2004 Invertebrate Zoology. A functional evolutionary approach. 7th Ed. Brooks/Cole, Thomson Learning learning, Inc. 990 p. | 2004 | Okenia angelica | --> |
| 1049 | Gosliner, T.M. and H. Bertsch 2004 Systematics of Okenia from the Pacific coast of North America (Nudibranchia: Goniodorididae) with descriptions of three new species. Proc. Calif. Acad. Of Sci. 55(22):414-420. | 2004 | Okenia angelica | --> |
| 822 | Behrens, D.W. and A. Hermosillo 2005 Eastern Pacific Nudibranchs: A guide to the Opisthobranchs from Alaska to Central America. Sea Challengers. Monterey, CA. 137 p. | 2005 | Okenia angelica | 52 |
| 1008 | Hermosillo, A. and D.W. Behrens 2005 The Opisthobranch fauna of Méxican States of Colima, Michoacán and Guerrero - Filling in the faunal gap. Vita Malacologia 3:11-22. | 2005 | Okenia angelica | --> |