"This is not Asteronotus cespitosus, it is Dendrodoris carbunculosa. Dendrodoris carbunculosa has circular compound tubercles on the mantle, whereas Asteronotus cespitosus has elongate (especially marginally) simple tubercles on the mantle."
Comment from Richard Willan
This is not Asteronotus cespitosus, it is Dendrodoris carbunculosa. Dendrodoris carbunculosa has circular compound tubercles on the mantle, whereas Asteronotus cespitosus has elongate (especially marginally) simple tubercles on the mantle.