Chromodoris aureopurpurea from South Korea

September 6, 2005
From: Dong Bum Koh

Dear Bill,
Here are photos of Chromodoris aureopurpurea from Sth Korea.

Locality: Ul Jin. Kyung Book Province, South Korea. Depth: 2 m. Length: Approx.25 mm. 31 Aug. 2005. rocky. Photographer: Ok Soo Kim

It looks like mating behavior but I'm not sure.

The dorsum of one animal has a balloon like swelling mass that is even bigger during observation than in the photos..Could you let me know, what is this?

Best regards,

Dong Bum Koh

Koh, D.B., 2005 (Sep 6) Chromodoris aureopurpurea from South Korea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Koh,
Your animals seem to be on the march somewhere. They don't seem to be mating or even positioned for mating. It is interesting how Jaoanese and Sth Korean specimens of this species have this typical yellow spotted pattern. However the dark spot in the lighetr purple patches around the mantle edge link the pattern to the slightly digfferentr pattern found elsewhere in the Indo-West Pacific.

I am pretty sure the swelling is a crustacean parasite in the pericardial cavity. I have seen similar infestations in species of Discodoris. In those the swelling was not obvious because the skin was thicker and stronger.
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Sep 6). Comment on Chromodoris aureopurpurea from South Korea by Dong Bum Koh. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

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