Aeolidia papillosa can be easily identified by its large number of flattened cerata on its body except for a triangular area that extends from the rhinophores to the mid dorsum. The cerata vary in color from grey to white and sometimes pink, orange, or green hues, depending on the species of anemone it has been feeding on. Though sometimes smaller, this species can grow to a length of 10 cm(4 in) in the Pacific Ocean and up to 12 cm(5 in) in the Atlantic Ocean.The maximum recorded length is 100 mm.
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