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DescriptionFacelina auriculata is a slender sea slug up to 38 mm in length. It has a white body and numerous small purple cerata. The oesophagus is also visible just behind the rhinophores through the slightly translucent body. There are three pairs of processes at the front end of animal. Closest to the substratum are the short propodial tentacles, which are part of the foot, and are at 90° to the body in a relaxed animal. The much longer oral tentacles project from either side of the mouth and appear forward of the propodial tentacles in an extended animal. Behind the oral tentacles on the top of the animal are the rhinophores, which have a ribbed appearance.Facelina auriculata occurs in two varieties: var. coronata is long and slender with the body extending rearward of the last cluster of cerata, while var. curta is shorter and broader than var. coronata and the body ends very near to the rearmost cluster of cerata (Thompson & Brown, 1976).