Parasorites, shell (test) of a large foraminiferan more than a millimetre in diameter. Some species of forams reach a considerable size for a single-celled organism. The largest living species has a test with a diameter of 5 centimetres. Fossil species were even bigger, to 11 centimetres. The pyramids of Egypt were made of limestone containing large forams (Nummulites).

Part of the Collection of the Foram Factory of the Micropolitan Museum © Wim van Egmond