Phylum Foraminifera (d'Orbigny, 1826)
Foraminifera are typically deﬁned as unicellular organisms characterized by the presence of granuloreticulopodia and the possession of a membranous, agglutinated, or calcareous test, which is either monothalamous (single-chambered) or polythalamous (multi-chambered).
Foraminifera live in marine and brackish water, but some members of this phylum can be found in fresh water, submerged mosses, sediments, and also in mosses growing on soil and walls. These species seem to be rare, only a handful of people ever found one, despite of their relatively large size. Usually the amoebae spread out their pseudopodial network when kept in petri dishes or on microscope slides in moist chambers.