Aglaja orientalis from South Korea

February 12, 2005
From: Dong Bum Koh

Dear Bill,
Thanks a lot for your comments which are very useful for me. Here are photos of Aglaja orientalis  from Hwa Soon Beach on 6 Nov. 2004.taken by Dong Bum Koh. That was the first time I have ever seen this species.

Occasionally, we have observed this animal at the same site during night diving. 4 days ago, my friend Byung Ro Youn took this photo that looks like the animal is laying eggs. Both photos were taken during night diving.

Locality: Hwa Soon Beach, Jeju Island, South Korea. Depth: 4 m. Sandy bottom with Rock Wall 

Upper Photo: 6 Nov. 2004. Length: 30 mm. Photo: Dong Bum Koh
Lower Photo: 6 Feb. 2005 laying eggs. Photo: Byung Ro Youn

Best regards,
Dong Bum Koh

Koh, D.B., 2005 (Feb 12) Aglaja orientalis from South Korea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Koh,
Thanks for these photos. Aglaja orientalis is indeed a strange looking aglajid. In the lower photo, the animal is laying eggs as you thought. I have often seen aglajids at this stage of making their egg mass with the egg string apparently wrapped around the head.

Since the egg ribbon is extruded from the common genital opening at the posterior end of the body I am not sure how the egg string gets to the front end of the body and ends up in a coil around the head. One of life's little mysteries.
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Feb 12). Comment on Aglaja orientalis from South Korea by Dong Bum Koh. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


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