On the 27 September 2017 I got a Bivetiella cancellata from the sandy bottom of Port San Miquel in Ibiza.
I put the living shell in my aquarium and for months I wasn’t sure if it was feeding as there is not much in the aquarium until I got from the fisherman 5 Bolma rugosa that I put in the aquarium with rocks so they can feed on.
Then one day I saw Bivetiella cancellata feeding of the Bolma rugosa.
So is Bivetiella cancellata a parasite, feeding on the blood or fluids of other molluscs ?