[Annelida] Identity sought of producer of cocoons or bladders attached to the lower shore of Cobo Beach

Geoff Read via annelida%40net.bio.net (by g.read from niwa.co.nz)
Mon Jul 4 19:40:23 EST 2011


Hi Bryony and all,

I'm sure Richard has got some private replies, but they aren't much good for the rest of us so. From the other side of the world I will make a couple of comments to stimulate debate but I haven't got an answer.

They do look rather like stranded salps, but I don't think they are. There's no coloured internal organs to be seen, and they do appear to be attached to burrows, and there is a definite burrow opening which more suggests a mobile surface-feeding species, rather than a deposit feeder such as Arenicola. Also UK Arenicola marina breeds in autumn (October onwards) and doesn't produce egg cocoons AFAIK (A. cristata & A. brasiliensis do). North Sea Scoloplos armiger produce egg cocoons but reproduce in February (but March on Guernsey - http://www.sustainableguernsey.info/blog/2011/03/its-worm-spawning-time-on-guernseys-beaches/ ).

Maybe a bit of work with a spade might have solved this one on the spot? Also it would be good to see the contents (eggs/embryos if present) up close.

Geoff

>>> On 4/07/2011 at 9:09 p.m., Bryony Pearce <bryony from seasurvey.co.uk> wrote:
> Hi Richard,
> 
> I may be wrong but these look like salps to me.
> 
> Best Regards
> Bryony
> 
> Research Director
> Marine Ecological Surveys Limited
> Glasgow


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