If it has been starved for several days in an aquarium it will attack an operculate form, but rarely with success.
Annandale, Nelson, Freshwater Sponges, Hydroids & Poly...(2011)
The small operculate genus Acme is a similar case.
Scharff, Robert Francis, The History of the European Fauna(2010)
We are not aware that operculate asci have yet been detected.
Cooke, M. C. (Mordecai Cubitt), Fungi: Their Nature and Uses(2010)