Dark brown-red mesial faces (1) of cerata have prominent pseudobranchs (2) with dark red tips like those of the tubercles.
Hydroid prey of this specimen was not recorded. Identification made by match of features in this and other images of it with the description in Morrow, C.C., Thorpe, J.P. & Picton, B.E. 1992. Genetic divergence and cryptic speciation in two morphs of the common subtidal nudibranch Doto coronata (Opisthobranchia: Dendronota: Dotoidae) from the northern Irish Sea. Mar. Ecol. Prog. Ser. 84: 53 to 61. pdf at www.int-res.com/articles/meps/84/m084p053.pdf?