A species of Halgerda?

August 18, 2009
From: Nick Chapman

Concerning message #21917:

Hello Bill,
Are there any Halgerda sp reported with the black pustules shown on this beast? Please excuse my stupidity if it's not a Halgerda!

Locality: Chaloklum Bay, 6 metres, Koh Phangan, Thailand, Gulf of Thailand, 03 June 2009, Sand, rocks. Length: ~3 cm. Photographer: Nick.

Thank you again & Best wishes,
Nick.

info@chaloklum-diving.com

Chapman, N, 2009 (Aug 18) A species of Halgerda?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22561

Dear Nick,

It certainly has the general appearance of some species of Halgerda, so please don't think of yourself as stupid, but it is one of the many forms of Dendrodoris denisoni. The blue spots are a good clue. Also, this species has a very thin body-wall, so if you touch it you would find it is much softer than a species of Halgerda, which has a thick muscular, somewhat rigid, body-wall.

Best wishes,
Bill Rudman

Rudman, W.B., 2009 (Aug 18). Comment on A species of Halgerda? by Nick Chapman. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/22561

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