Armina semperi from Thailand

September 4, 2008
From: Lawrence Neal

Hi Bill,

Here are a few pictures of an Armina sp. from the Gulf of Thailand. I think it's Armina semperi.

The pictures were taken during the daytime in a sandy, sheltered bay, around 11 metres deep. Several species of sea pen also live in the area.

Locality: Koh Sark, Pattaya, 11 metres, Chonburi, Thailand, Gulf of Thailand, South China Sea, 10 August 2008, Sheltered bay with mixed sand and sediment. Length: 50 mm. Photographer: Lawrence Neal.

Best wishes,

Neal, L., 2008 (Sep 4) Armina semperi from Thailand. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Lawrence,

Thanks for these photos. It is certainly the animal I am calling Armina semperi. I have included a few 'close-ups' to show the detail of the head and rhinophores.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Sep 4). Comment on Armina semperi from Thailand by Lawrence Neal. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Armina semperi

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