Hypselodoris bullockii

(Collingwood, 1881)

Also known as: Hypselodoris bullocki

Hypselodoris bullockii
Photographed by: Yuji Law

Species:Hypselodoris bullockii

Comment from Richard Willan on photo #7548
An atypical individual with a vivid white marginal band and a bluish purple submarginal band.

Comment from Nathalie Yonow on photo #3431
Very pale and lacking the ‘amethystine’ colour.

Comment from Nathalie Yonow on photo #2635
This one appears to approach Collingwood’s description the best with the ‘amethystine’ colour on the front and the tail

Comment from Richard Willan on photo #1965
A very variable species. The blue band round the head and on the tip of the tail that this individual possesses, are often absent.

Additional comment from Dr. Nathalie Yonow: Yes I agree with Dr. Willan on this one. It is a bit extreme, and unusual, in its blues and reds.

Comment from Richard Willan on photo #1976
A rather more “typical” individual than the one above.



Pictures of Hypselodoris bullockii

Hypselodoris bullockii from Buton Island, Indonesia
Posted 8 years ago
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Similar Species

Author: Nila Murti

There are still some debates as to whether these two Hypselodoris nudibranch with the same body form are separate species or just colour variations of the same species. The main difference is in colouration. Hypselodoris apolegma has a darker and deeper purple colour that grades towards the mantle margin into purple dots and finally into solid white along the edge of the mantle. The base of the gills and antennas (rhinophores) are also rich purple in colours, but changed to deep yellow at the ends.

Hypselodoris bullocki has several pale purple shade variations, from very pale, almost white, whitish purple to purple, but never as dark as the purple found in Hypselodoris apolegma. The colour is uniform over the whole mantle, with a narrow band of white or dark purple at the mantle edge. The gills and antennas are yellow with purplish base or pale purple all over.

Risbecia apolegma from Ambon, IndonesiaIdentification reviewed by Nathalie Yonow
(224 photos)
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