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Chalk tubes

Spiral tubeworms

Picture informations: Spiral tubeworms
Author(s) Rainer Borcherding
Licence owner Schutzstation Wattenmeer
Licence statement Copyrighted Material; the copyright remains with the author (not this web publication)
Licence cc-by-sa 3.0
Small curled tubes on algae, stones or crabs  

Chalk tubes, slightly curved

Picture informations: Chalk tubes, slightly curved
Author(s) Rainer Borcherding
Licence owner Schutzstation Wattenmeer
Licence statement Copyrighted Material; the copyright remains with the author (not this web publication)
Licence cc-by-sa 3.0
Slightly bent tube, often tapering towards the end  

Twisted chalk tubes

Picture informations: Twisted chalk tubes
Author(s) Rainer Borcherding
Licence owner Schutzstation Wattenmeer
Licence statement Copyrighted Material; the copyright remains with the author (not this web publication)
Licence cc-by-sa 3.0
Erratically wound tubes, diameter constant or increasing  

Shipworms

Picture informations: Shipworms
Author(s) Rainer Borcherding
Licence owner Schutzstation Wattenmeer
Licence statement Copyrighted Material; the copyright remains with the author (not this web publication)
Licence cc-by-sa 3.0
Shipworms