The PEDIGREE of

Phylum Foraminifera (Amoeboids with reticulose pseudopods)

 
     (often have shells, most common on seabed (incl. deepest), but also found in planktonic environment and, slightly in freshwater and poss. land soil; these protozoa have been common for aeons, making their fossils useful for research); aka Subphylum Foraminifera