Halgerda formosa and H. punctata

January 28, 2003
From: Danny Van Belle

Hi Bill,
I filmed this Halgerda in February 2001.
Divesite: Christmas Point, Koh Bangu, Similan Islands

I went through the list of Halgerda on the site but couldn't find one which has the black spots on it's lower body half.
Danny

dannyvb@hotmail.com

Van Belle, D., 2003 (Jan 28) Halgerda formosa and H. punctata. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/8905

• Note added 7 January 2004. This is almost certainly a form of H. wasinensis. See relevant discussion.
• Note added 31 January 2003: This is not H. punctata. See Terry Gosliner's message and my comments

Dear Danny,
These are another group of interesting photos. This is a species which I identified many years ago (Rudman, 1978) as Halgerda punctata, but more recently (Fahey & Gosliner, 1998) it has been considered a synonym of Halgerda formosa. However, Marina Poddubetskaia's photos from Mauritius, and Bernard Picton's photos from east Africa suggest that H. punctata and H. formosa are quite distinct species. Marina's photos match the illustration in Bergh's description of H. formosa very well suggesting that it can be distinguished by the many secondary yellow lines running along the long axis of the mantle, and with only a few black spots arounf the edge. H. punctata on the other hand, as illustrated in your photos has yellow lines radiating out from each tubercle and with many scattered black spots around the mantle edge.

I will leave these as 'H. formosa' at present but I would like to hear from Shireen and Terry on what they think now we have more photos to compare
Best wishes,
Bill Rudman

Rudman, W.B., 2003 (Jan 28). Comment on Halgerda formosa and H. punctata by Danny Van Belle. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/8905

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