Halgerda wasinensis? from Sodwana Bay

October 21, 2008
From: Colin Ogden


Concerning message #21501:

Hi Bill,
Here is another Halgerda that looks like it could be a H. wasinensis, but with all the yellow colour missing.

Locality: Sodwana Bay, 20 metres, South Africa, Indian, 07 October 2008, reef. Length: 40mm. Photographer: Colin Ogden.

Your opinion would be appreciated.
Regards
Colin

scubaco@iafrica.com

Ogden C. M., 2008 (Oct 21) Halgerda wasinensis? from Sodwana Bay. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21948

Dear Colin,
I look at new messages concerning Halgerda from southern Afirca with a certain fear and trepidation, because we clearly have a lot to learn about variability and species differences. Your photos were no exception - but then I noticed the yellow on the rhinophores below the black. This is a feature of the colour pattern of the 'typical' H. wasinensis illustrated on the Fact Sheet, and I think is unique to that species. So it is rather ironic that these animals, which essentially lack the yellow pigmentation usually found in H. wasinensis, have kept the little bit on their rhinophores which most links them to H. wasinensis. That is not to say that all the photos I have identified as H. wasinensis, are that species, but I suspect all the ones with black lines on the gills are most probably colour forms of it.

So thanks very much.

Best wishes,
Bill Rudman

Rudman, W.B., 2008 (Oct 21). Comment on Halgerda wasinensis? from Sodwana Bay by Colin Ogden. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21948

Factsheet

Halgerda wasinensis

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