dejayM's picture

Nudibranch egg maze

Observed: 24th June 2013 By: dejayM
Biological Recording In ScotlandHighland Biological Recording GroupOrkney Biodiversity Records Centre
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Only a small piece of evidence gathered allows this tentative ID.
The creature (Favorinus branchialis) is rare in UK as a whole but is recorded several times in Orkney waters. There is no other record in iSpot.
I caught a glimpse of a very white creature today but it was impossible to photograph.
One quite reasonable photo-record here -
Unusual because it feeds on others' eggs.
>>GBIF Portal<<
Records these can be interrogated, individually, after accepting Term & Conditions, by zooming the Map to the specific location and clicking View Records - In viewable area.
23 March - added, then removed a photo! (as you do)
25th March Amended the GBIF link

Species interactions

No interactions present.


gramandy's picture


...with an i, Habitas has this sp as having eggs wound like a hair spring - is this hairspring? I guess so. Have you come across lots of nudibranch eggs here, that would be a good pointer.

dejayM's picture


Origin 2 July 2013
Yes "...thin thread wound like a hair spring..." does seem to describe it but it is a loose spring - more maze-like shall we say?
My other link is more conclusive.
I have read all I can find and my own conclusion is still the same. That's where my money is.
But it's NEVER going to be certain until I gat a photo of the laying mother!
It'd be nice to get supportive agreements - which should also have subdivisions - "I think you might be right" Box.
Sadly, this Forum has died
Thanks for the spellcheck.

Post revisited to add more convincing links.

gramandy's picture


...I'd like to agree, but no experience. Had a look at web too - harsh area the nudis, even my seasearch pals round here after having done courses and courses on the little creatures are never too sure of anything they find. So you have my support and best guess for me is as you say. Not brave enough to agree though. I'll ask Becky H to have a look - she has done some courses on the nudis and is an iSpot person. She might be able to agree with you Derek.


JoC's picture

Favorinus branchialis

"The spawn for this species is a flat spiral with numerous (up to 20,000) white eggs of about 50-70 microns in diameter." it says in OPK, so I agree.
The sea slug forum lives again. sea slug forum


dejayM's picture


Origin 23 March
Thanks Jo...what did you forget to do...?
I thought I might have a photo of the mother. I took the hint from the picture-link you gave of the Sea slug Forum. Is shows a flamboyant red slug - which I now cannot accept as the parent; certainly does not match the description.
Picture 1 here shows a grey substance under the eggs. It has form and shape - what could it be?
It is about time some more people came to marines. How anyone can get beyond three Icons in Marine stuff I don't know!
Oh yes, gulls and wracks!
Have a laugh at my first ID here!
Much later
At last an agreement - a boost for the new season - thanks.
I must say it IS nice to get the Forum back again after seemingly such a long break.
One or both of us should get the book

JoC's picture

I agree, I forgot.

23.3.14 OPK says "they can be almost completely covered with opaque white pigment or just sprayed with a few white spots".

Scottish nudibranchs shows just white ones.
26.3.14 Edit link (thanks dj)


gramandy's picture

have heard this...

...but again the nudis really not my forte.

Might get a course on these little guys. Still no help to you though at the moment.

We have a tide pool opening next week and I hope to see some of the nudis/or eggs/or squat lobsters, sponges again.

Come on Derek, spots against your name is not why you do this (is it?)


dejayM's picture


Thanks G. You're right, I'm not in it for praise or points - just sheer inquisitiveness. I grieve a little because there are lots of excellent Marine Biologists who could come here and participate but don't. Interestingly, I am certain that if my mysteries became non-mysteries immediately, I'd lose interest!
Do try the GBIF Portal sometime.