Chromodoris from Kerama Island

June 2, 1999
From: Atsushi Ono

How do you do,
Dr.Bill Rudman.

My name is Atsushi Ono. I Have been collecting Opisthobranch photos at Kerama Is. near Okinawa Is. Your site The Sea Slug Forum is very useful, I visit 2 or 3 times a week. But I am not good at English.

I'm sorry for my poor English. So that Ms. Rie Nakano sent you my photographs and asked ID before.

This time, I try to write English by myself.
Please help me with some some Opisthobranch names.

I think this is Chromodoris sp.
7m depth, under dead coral rubble, 8mm length. April 1999.

Atsushi Ono

Ono, A., 1999 (Jun 2) Chromodoris from Kerama Island. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Atsushi,
Don't worry about your English. Your good photos don't need many words!
I can't be 100% sure without a specimen, but I think this is a juvenile of Chromodoris aspersa. It is the only species I know with the diffuse purple ring around each purple spot. The lack of a yellow mantle border is not necessarily a problem as juvenile chromodorids often don't develop their coloured borders until they are quite large.

Best wishes,
Bill Rudman.

Rudman, W.B., 1999 (Jun 2). Comment on Chromodoris from Kerama Island by Atsushi Ono. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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