Colour variation in Halgerda wasinensis

July 5, 2005
From: Colin Ogden

Hi Bill,
The more I learn about nudibranchs the more fascinated I become, and also the more confused I get by all their variations. I have three photos here of what I believe are Halgerda wasinensis, and they all have marked differences which I have noticed on this species before.
Upper right: shows definite white areas surrounding the black inside the yellow ridges.
Lower left: shows no black spots on the edge of the mantle, and a marked difference in the pattern of the ridges. Also the gills do not appear to end in "feathers" as in the other 2 photos. The black markings on the gills are definitely more pronounced than on the other 2 animals.
Lower right: shows definite white spots where the yellow ridges meet. All these photos are from the same area. I see there has already been some discussion on the variations found in this species. I hope my observations can contribute.

Locality: Sodwana Bay, South Africa, Indian Ocean. Depth: 22 to 26 metres
Length: 50 to 55 mm. 02 July 2005. Coral reef. Photographer: Colin Ogden

Regards,
Colin

scubaco@iafrica.com

Ogden C M, 2005 (Jul 5) Colour variation in Halgerda wasinensis. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14189

Dear Colin,
It's a while since we've had any problematic Halgerda photos on the Forum but I think your lower left photo is not H. wasinensis. The yellow border to the mantle and the foot seems quite distinctive. Perhaps Shireen Fahey or Terry Gosliner can give us a clue
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Jul 5). Comment on Colour variation in Halgerda wasinensis by Colin Ogden. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14189

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