Is this an opisthobranch?

August 11, 1999
From: Atsushi Ono

Dear Bill,
I found these small animals on a shallow sandy bottom. This is common species in Kerama Is. [near Okinawa] in Japan. They are seen in May and June. 3m depth, 10mm long.

This animal  has small black patches on his translucent body. This animal has a shell and is similar to a mouse! Could you help me to identify this animal? Is this opisthobranch?
Atsushi Ono

Ono, A., 1999 (Aug 11) Is this an opisthobranch?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Atsushi,
I had a feeling that Clay Carlson & Patty Jo Hoff had discussed this animal with me before so I asked them for advice. They say it is one of a group of cephalaspid bubble shells related to Haminoea, and have sent a separate message with pictures of the shell and a gizzard plate.

Bill Rudman.

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