Museoidaceaes
Museoidaceaes is a taxonomic group of unicellular eukaryotes traditionally classified within the superphylum Cercozoa. The group is characterized by a distinctive radially symmetric, calcareous test composed of concentric layers of organic matrix and calcium carbonate. The morphology of Museoidaceaes tests often exhibits a central aperture surrounded by a series of concentric ridges, which are interpreted as growth increments. The organic matrix is rich in polysaccharides and proteins, and the biomineralization process is believed to be regulated by intracellular vesicles that precipitate aragonite or calcite depending on environmental conditions.
Members of Museoidaceaes are predominantly marine planktonic organisms found in both surface and sub‑surface waters. They
Ecologically, Museoidaceaes are important components of the marine microzooplankton community. They serve as food for small
A comprehensive review of the group’s taxonomy and paleontological significance is presented in the monograph "The