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Found as far back as the Cambrian, they are useful for many purposes, including paleoclimatology, paleoceanography, finding oil deposits, and research into the evolutionary process.
This count may, however, represent only a fraction of actual diversity, since many genetically discrepant species may be morphologically indistinguishable (Kucera and Darling 2002).
The cell is divided into granular endoplasm and transparent ectoplasm.
The pseudopodial net may emerge through a single opening or many perforations in the test, and characteristically has small granules streaming in both directions (Sen Gupta 1999).
The pseudopods are used for locomotion, anchoring, and in capturing food, which consists of small organisms such as diatoms or bacteria (Hemleben 1989) A number of forms have unicellular algae as endosymbionts, from diverse lineages such as the green algae, red algae, golden algae, diatoms, and dinoflagellates (Hemleben 1989).
As members of Granuloreticulosea, they were grouped with the lobose and filose amoebae as part of the superclass Rhizopoda, subphylum Sacrodina, and phylum Protozoa.
However, molecular data has challenged the monophyly of Rhizopoda as well as Granuloreticulosea. There are about 4,000 described living species of foraminifera (Olney 2002).
However, the exact relationships of the forams to the other groups and to one another are still not entirely clear.
The form and composition of the test is the primary means by which forams are identified and classified (Schweizer 2006}.
Thus they are very useful in paleoclimatology and paleoceanography.Tags: Adult Dating, affair dating, sex dating