Hoplodoris grandiflora? from nthn New South Wales

Dear Denis,
As you may be aware the species of Hoplodoris have recently been reviewed. The genus consists of a number of very similar nodulose dorids. [See generic review of Hoplodoris]

Unfortunately, apart from a couple of obviously different species, such as Hoplodoris armata and H. estrelyado, the others are very difficult if impossible to accurately identify externally. I have been calling them "Hoplodoris nodulosa group" all my career. They do have quite significant differences anatomically in their reproductive systems and radular morphology. It's just unfortunate they don't seem to be reflected by external differences.

Your animals could be H. nodulosa, although the reddish median band in the upper photo is reminiscent of H. nodulosa. In some specimens of H. nodulosa, the tubercles in the central region are lower and more scattered than on the main part of the mantle. In your animals these tubercles are of similar size to the rest, so on those grounds, which are fairly flimsy, I would tentaivley agree that your animals are H. grandiflora.
Best wishes
Bill Rudman