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Limenandra fusiformis (Baba, 1949) [Baeolidia]

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Limenandra fusiformis is characterized by concentric rings forming 'targets' down the dorsal midline. The rhinophore clubs have posterior papillae, there are no papillae on cerata. When crawling the innermost cerata in the most posterior row of each ceratal cluster waves around, that makes it appear to 'jerk' along.
Very similar is:
Baeolidia nodosa (Haefelfinger & Stamm, 1958) which differs by papillae on the cerata, and is the type species of the genus Limenandra. It was described from the Mediterranean Sea, now there are worldwide records of it, from the Caribbean, to Eastern Atlantic Ocean, Indian Ocean, and to the Pacific Ocean, excellent pictures of it from Japan are at Jun Imamoto's website!
More informations on Limenandra fusiformis are at Bill Rudman's Sea-Slug Forum!