Identifying Foraminifera Microfossils

Foraminifera (often called "forams") are single-celled organisms (protists) that produce shells or "tests" typically made of calcium carbonate. These tests are common microfossils found in marine sediments.

Microfossil Classification

We need to identify which of the given options represent foraminifera.

• Miliammina: This is a genus belonging to the Foraminifera group, known for its agglutinated tests (constructed from external particles).
• Triceratium: This is a genus of marine diatoms. Diatoms are single-celled algae with cell walls made of silica (frustules), not calcium carbonate tests. Therefore, Triceratium is not a foraminiferan.
• Cibicides: This is a common and widely studied genus of benthic (bottom-dwelling) foraminifera, characterized by its planispiral or trochospiral tests.
• Guembelitria: This is a genus of small, planktonic (free-floating) foraminifera, often found in Cretaceous and Cenozoic sediments.

Conclusion

Based on the classification:

• Miliammina is a foraminiferan.
• Triceratium is a diatom.
• Cibicides is a foraminiferan.
• Guembelitria is a foraminiferan.

Therefore, the microfossils that are foraminifera are Miliammina, Cibicides, and Guembelitria.