"Whiter than Phyllidiopsis krempfi and much less black usually reduced to to the central oval and four short perpendicular ones extending to the margins at each end and each side.
Previous comment from Dr. Richard Willan: Note the compound tubercles (simple in Phyllidiopsis shireenae) and bicoloured rhinophores (uniformly orange-pink in Phyllidiopsis shireenae). Phyllidiopsis krempfi and Phyllidiopsis pipeki are very close to each other (and not always distinguishable), but Phyllidiopsis shireenae is consistently different."