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

July 3rd, 2011 by Richard Lord

On 2 July 2011 the substrate of the lower shore of Cobo Beach on Guernsey’s west coast had many transparent bladders or cocoons attached to it.

The lower shore of Cobo beach on Guernsey's west coast showing the location of the bladders or cocoons attached to the silty substrate on 2 July 2011 (click image to expand - ©RLLord)

These transparent bladders or cocoons were at ELWS where the slope of the beach levels out and the beach becomes silty.

Numerous transparent bladders lie on the silty substrate at ELWS on Cobo beach on 2 July 2011 (click image to expand - ©RLLord)

These bladders or cocoons have a strong skin and dimensions of about 4 to 6 cm.

These transparent bladders are substantially larger than the egg cocoons of paddleworms seen on Guernsey beaches in the spring (click image to expand - ©RLLord)

The skin forms a tube down a hole into the beach.

The transparent bladders narrow into a tube which is firmly attached to the substrate (click image to expand - ©RLLord)

If you know the identity of the producer of these transparent bladders or cocoons and their purpose please leave a comment on this web page or email fishinfo @ guernsey.net  Thank you.

 

1 Response to “Identity sought of producer of cocoons or bladders attached to the lower shore of Cobo Beach”

  1. Peter Gibbs MBA Plymouth

    Structure fits Scoloplos armiger but are much larger than is typical plus this species breeds Feb to April. The strand/tube extending into the sand suggests a polychaete but sorry to report I do not know which!
    If you do get an ID I would be interested to hear.

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