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Thorunna cf. purpuropedis  Rudman & Johnson, 1985

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cf. is an abbreviation from a Latin word (confer) and means 'refer to' or 'compare with', here it means it could possibly be Thorunna purpuropedis or perhaps something closely related, or at least similar in appearance.
Thorunna purpuropedis is characterized by its purplish-white mantle with a broad orange band at the mantle margin. On the inside edge of the orange band is a thin red line. The rhinophores and the gills are orange-red. The foot is pale purple, deepening posteriorly and on the oral tentacles.
These specimens were labelled by Dr. Alicia Hermosillo 'Thorunna not purpuropedia', I can't tell how they differ from Thorunna purpuropedis, maybe by the posterior end of the foot, which seems to have an orange tip.
Thorunna purpuropedis is only known from the Marshall Islands, and of some doubtful specimens from Japan.
More informations on Thorunna purpuropedis are at Bill Rudman's Sea-Slug Forum!