Re: Hypselodoris bullocki - different colours mating

June 8, 2002
From: Kheong Sann Chan

Hi Bill,
I was just looking at the photo of the 2 shades of H. bullocki mating and I notice that the white one's gills are much smaller than those of the purple one. Do you know of any reason for this? Do you suppose that the size of their gills is related to their age or anything like that?

Kheong.

kschan@mail.dsi.nus.edu.sg

Chan, K.S., 2002 (Jun 8) Re: Hypselodoris bullocki - different colours mating. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7178

Dear Kheong,
The reason the gills look smaller in the white one is because they are partly withdrawn into a pocket on the back of the animal. The dorid nudibranchs are divided into two 'Superfamilies' - the EUDORIDOIDEA and the ANADORIDOIDEA. One of the main differences between the two is that in the Eudoridoidea the gills can be withdrawn into a pocket for protection. Another name for the superfamily is the 'Cryptobranchia' which basically means 'hidden gills'. In the Anadoridoidea there is no pocket into which the gills can be withdrawn, although the gills can retract against the body when the animal is disturbed. Another name for this group is the 'Phanerobranchia' which means 'visible gills'.

You can see from the Species List which dorids belong in which superfamily. There is some debate about whether this division reflects evolution or is just a convenient way of splitting the dorids into two, more manageable, groups.
Cheers,
Bill Rudman

Rudman, W.B., 2002 (Jun 8). Comment on Re: Hypselodoris bullocki - different colours mating by Kheong Sann Chan. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/7178

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