Ercolania boodleae? from Japan

February 14, 2000
From: Yasuhiro Shirai

Dear Bill,
Thank you for your quick reply.
I found this opisthobranch at Shima.
This opisthobranch crawled on rock with algae. Could you please identify this animal for me.

Location: Shima Pref. Mie Japan (Kii Peninsula east coast)
Length: 6mm
Water temperature: 13C
Date Jan. 2000
Depth: 3m
Crawling on rock

Best regards,
Yasuhiro Shirai

Shirai, Y., 2000 (Feb 14) Ercolania boodleae? from Japan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Yasuhiro,
I think this animal is Ercolania boodleae but it would help to know something about the colour of the tips of the branchial papillae [cerata]. Are they reddish brown? It is not possible to see in your photo.

Many of these 'aeolid-like' sacoglossans are commonly found in the intertidal region, often quite high on the shore.

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Feb 14). Comment on Ercolania boodleae? from Japan by Yasuhiro Shirai. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Ercolania boodleae

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