Star-shaped microfossil

[E Alexander]

Hi, having a bit of trouble identifying this microfossil. It was found in a marl formation of late Bartonian in age in the southern Spanish Pyrenees (the Oliana Anticline). The marl is rich in nummlitoid formainifera, however, this does not appear like the others. It could possibly be the cross section through an echinoderm spine?? 

Any suggests are much appreciated! 

 

(photo taken with x10 magnification)

[Al Dente]

My first guess is a cross section through a calcareous worm tube. Some have ridges that run along the tube.

[abyssunder]

Or, it could be a scaphopod shell in transverse section, a dentaliid, like Dentalium .

They feed on microorganisms, like foraminiferans.

Gadilids are usually smaller than dentaliids.