ABK's picture

Unidentified Sea Slug

Observed: 5th August 2012 By: ABKABK’s reputation in InvertebratesABK’s reputation in InvertebratesABK’s reputation in InvertebratesABK’s reputation in Invertebrates
Sea Slug

Only small between 1-2cm long.

Species interactions

No interactions present.


ChrisMcA's picture

alderi photos

Thanks for the info, dj;I believe I've found the medslugs.de link in a different folder, so it should now work.

Nick Upton's picture

which slug

I did consider alderi which fits for looks and size, but rarity and lack of records for isle of Man that I could find made me wary of going for this. It could be a new record, but an expert in the group would need to see it (and they seem variable on colours) and maybe a specimen. It might be a young individial of a larger species.. As for habitat, the info online on these may well be incomplete and I often find "subtidal" species on the shore on low spring tides! Aeolidiella sp. may be the safest...

Nick Upton, naturalist and photographer.

ChrisMcA's picture

I take your points.Aug 5th

I take your points.Aug 5th was pretty low (inW.wales terms .9m out of 7.6m range) but time of photo would help ABK. I'm still a bit partial to my id, but I've never seen either species, So I guess Aeolidiella sp could be a 3rd option (safer even!)

ABK's picture

Photo was taken at 19:15 and

Photo was taken at 19:15 and it was pretty much full low tide at the time, with the sea slug being found at the waters edge. Thank you for all the ID, comments and interest in the sea slug.

dejayM's picture


I found this in history - which seems to begin after a week!
Note, Chris, that it's still a Global, in fact all three IDs are - an early infection then.
I'd like to agree but just can't (yet).
I've been here
and http://www.medslugs.de/E/mssmain.htm
for quite some time. It could be Aeolidiella alderi but Andy's picture has a lot of yellow to it and this is rather subdued in all the source material I can find.
Ignoring the proferred IDs and searching the Catalan site for Aeolidiella (you need to use CtrlV to paste) reveals lots of similar species and using very pale yellow and a paler head adornment as possible key feature one might assume Calma glaucoides (one UK record - NI though) or Cuthona flavovulta (NO UK records) Flabellina babai (Med). Somehow though, I doubt all those 'cept C.flavovulta and Nick's Aeolidiella glauca and it may not be possible to get nearer.
I have learned to trust Chris' gut instincts (one of his links is broken) but cannot make his ID fit on the grounds of the lovely pale yellow adornments.
This is a lovely picture - oh for one in the water Andy!
No help perhaps but I enjoyed the time.

ChrisMcA's picture

The 2nd picture in

The 2nd picture in http://www.seaslugforum.net/aeolalde.htm does approximate ABK's, but with orange tips instead of yellow. by the way,dj how did you 'find this in history, which starts in about a week?'-I cant see any history links in Ispot.

dejayM's picture

Coastal History

...well, it seems to me that VERY rarely does anyone look at posts over a week old and only then if someone has added a remark or, perhaps, made a Core Edit - flags then appear for those with the right filters ticked. iSpot seems to have a prevalence of specialists who specialise, say following Birds or Diptera posts, I don't think this is healthy, as most of those might consider themselves good Naturalists.
Then there is history, real history. Take Coastal, for instance, you often reside there -
Go to the very Last posting (which is actually the First). Guess who was the first to Post a Coastal? Anyway it deserves attention - where is Jo, the specialist?
I think it a great pity that few people (appear to) look at posts over a week old but there is a mine of information in History. Old hands should spend some time there, clean up some of those in the doldrums.
Beyond that Chris, I do think A.alderi is close (36 records in UK, none in IOM) but obviously not conclusively. The general appearance is right, shape, adornment, size even but it's hard to find one with that light primrose-yellow predominating. (though look at this http://doris.ffessm.fr/fiche2.asp?fiche_numero=1920)
Obviously you have the right filters ticked but you should spread more of your wisdom through history.
Have you just, recently, agreed to A.glauca?

ChrisMcA's picture

(the agreement must h.b. a

(the agreement must h.b. a slip-up I'm afraid)