Marionia sp. from Japan

July 5, 2002
From: Hikaru Nakada

Hello Bill,
Here are two photographs of a nudibranch I found at Maedamisaki (Onna village, Okinawa, Japan). Could you please let me know its name.

Location: Maedamisaki (Onna villege, Okinawa, Japan)
Length: over 130mm!(TL)
Depth: 5m
W.temp: about 25C

Hikaru Nakada

Nakada, H., 2002 (Jul 5) Marionia sp. from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Hikaru,
This is a species of Marionia which I am calling Marionia sp. 2 on the Forum. it belongs to the family Tritoniidae, many of which eat soft-corals. They are often found on soft corals and their colour and gills make them quite camouflaged. This species is not uncommon in the Indo-West Pacific but there are a number of names given to similar animals and until we sort out how many species there are it is probably best not to use the names.
Best wishes,
Bill Rudman

Rudman, W.B., 2002 (Jul 5). Comment on Marionia sp. from Japan by Hikaru Nakada. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Marionia sp. 2

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