Unknown Halgerda

April 29, 2008
From: Valda Fraser


Concerning message #9599:

Dear Bill
What have we here? Maybe a Halgerda wasinensis variation. But, it's too different. Any ideas?

Locality: Ponta D'Oura, 41 m, Mozambique, Indian, 28 January 2008, On top of rocky reef . Length: 35 mm. Photographer: Valda Fraser.

Regards
Valda Fraser

valdafraser@mweb.co.za

Fraser, V.J., 2008 (Apr 29) Unknown Halgerda. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21501

Dear Valda,

This is probably the same as species animal as the one in your earlier message [#2949]. If you look through messages from Sth Africa I have idenitified as H. wasinensis you will see many have this thin opaque white edge to the mantle. If I am correct, your animal here has an excess of black, and many of the yellow lined ridges are absent. As I said in response to another recent Halgerda message from Sth Africa [#20670], we still seem to have some work to do on this genus, especially in your part of the world.

Is it a variant of H. wasinensis? I dont think we can really say. Its possible all the very black specimens from sthn Africa which I have indentified as H. wasinensis are a distinct species, but there does seem to be a link between the black-spotted 'typical' forms from east Africa and the more heavily pigmented forms further south. At present I'll just have to say I am not sure.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Apr 29). Comment on Unknown Halgerda by Valda Fraser. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21501

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