Foraminifera is single cell based organism which is like that of ameboid cells and vary in marine water
Habitat:
open ocean
Foraminifera, or forams for short, are single-celled organisms that live in the open ocean, along the coasts and in estuaries. Most have shells for protection and either float in the water column (planktonic) or live on the sea floor (benthic).
It seems something like Cribroelphidium gunteri (although gunteri has less pustules) or C. margaritaceum (although margaritaceum is more keeled). If this is the case, they normally live in coastal areas (intertidal to subtidal).
Fabio, I checked the original description of Cribroelphidium gunteri
(of Elphidium gunteri Cole, 1931) Cole, W.S. 1931. The Pliocene and Pleistocene foraminifera of Florida. Florida State Geological Survey bulletin 6: 7-79., available online at http://publicfiles.dep.state.fl.us/FGS/FGS_Publications/B/BPRIDE/B6_1931.pdf [details]
and C. margaritaceum (Worms), however both lack similar characteristics as "my" species i.e., the very distinct pustules.