Can someone help with the identification of a Polyclad flatworm?

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Mauricio Oscar Zamponi

Dear Jan.

The flatworm is Platyhelminthes,Turbellaria,order Tricladida (or order Acoela) and knowed like Planaria.

Good like

Salvatore Giacobbe

dear colleaugue, I can not tell you the name of the species because I am not a specialist, and it is not possibilwe a correct determination based on a photos. Nevertheless, I recorded a similar infestation in mussels from the Adriatic Sea and a study on a similar infestation in Tunisian has just published. To follow the developments of this apparent expansion might be of interest.