Comment from the photographer: From the very few pix on the web I concluded this appears to be a Marionia sp.

Photo Information

Photographer
Hans van Rijn
Species name
Marionia sp.
Camera
Nikon D200
Taken on
3 July 2010 11:57:30 am
Posted
13 years ago
Updated
13 years ago

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EXIF Information

Camera
Nikon D200
Date and Time
2010:06:03 11:57:30
Exposure Time
10/900
Exposure Bias
0/6
Focal Length
600/10 mm
Horizontal Resolution
300/1 dpi
Vertical Resolution
300/1 dpi
Aperture
f/13.0
ISO
200
Exposure Program
Manual
Exposure Mode
Manual exposure
Metering Mode
Spot
Light Source
unknown
Flash
Strobe return light detected
White Balance
Manual white balance
Color Space
sRGB
Software
ACD Systems Digital Imaging

Scientific Classification

KingdomAnimalia
PhylumMollusca
ClassGastropoda
OrderNudibranchia
SuborderDendronotina
FamilyTritoniidae
SpeciesMarionia sp.