Thank you, Enzo.
In fact, magnification shows some fine spiral striae, but so weak I was
not aware they could exist ; all of same "strength"...
I see CLEMAM lists coarctata as a valid taxon, and costata as junior
synonym, but some pdf files I found on your Italian sites suggest both
species do exist.
So I decided to follow your opinion. Welcome to Donovan's costata, and
thank you, Enzo & Philippe, for your helps!
Olivier
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