Sponges are capable of total regeneration, even from the smallest pieces of their bodies.

Yes, sponges are capable of regenerating its different body parts even the smallest units of their bodies (e.g. single cells). They may be separated by mechanical methods (e.g. squeezing) or chemical methods (e.g. elimination of calcium and magnesium from seawater). They do this when small aggregates of cells called archaeocytes attaches itself to a surface, where they flatten and develop an envelope of special cells called pinacocytes. Unlike other organisms, sponges don’t have brains because of their regenerative capabilities.

Fungi is were it belongs