Can anyone tell me the name of this ring-type fauna attached to Turritella whorl?

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Şerban Procheş

worn-off remains of a former barnacle?

Roberto Ardovini

It is just a root of Balanidae.

The Balanus is dead and leaves the imprint.

Deepak Samuel Vijay Kumar

I agree with Serban and Roberto, marks left behind by barnacles..

Yves Gruet

Entièrement d'accord avec ce qui a été dit ci-dessus. Il s'agit d'une base de Balane (basis of a barnacle which had calcareous basis. All have not. ) See not far from Balanidae Yves G

Jorge A. Quirós-Rodríguez

I agree with all, its barnacle calcareous basis attached to gastropod