At present the Caribbean species of Doto are difficult to identify so I am placing most of them here until I get some expert advice. Dr Ortea's has recently described a number of new species and partially reviewed earlier species descriptions for the western Atlantic. This valuable addition to our knowledge gives us some information on the food choice of various species but until we know more about variability within a species I don't feel competent to make identifications from photographs.
Ortea, J. (2001). The genus Doto Oken, 1815 (Mollusca: Nudibranchia) in the Caribbean sea: Natural History and new species description (in Spanish). Avicennia Supplement 3: 1-46.
Rudman, W.B., 2009 (June 3) Doto spp. unidentified Caribbean. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/dotocarib
Nudibranchs on Sargassum
From: David M. Knott, May 20, 2010
Re: Doto uva from Jamaica
From: Linda Ianniello, June 3, 2009