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Foraminiferans - Protozoan
Foraminiferans are largely benthic marine species. They have multi chambered calcareous tests or shells with numerous pores, hence the name foraminifera or pore bearer. A single large opening allows the cytoplasm to protrude out. The chalk cliffs of Dover England are formed from deep sediments of foraminiferan shells.
Figure: Various types of foraminiferan shells formed chiefly of calcium carbonate. A fossil species -Nummulites is an important contributor to the great limestone deposits in certain parts of the world.
KARYOTHEC A OR NUCLEAR MEMBRANE It is also called Nucleolemma, term given by Erclab & Hertwig. Karyotheca composed of two unit membranes separated by a 150-300 A° wide p
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