Question

Which of the following microfossils is/are foraminifera?

• A. Miliammina
• B. Triceratium
• C. Cibicides
• D. Guembelitria

Hint:

- Foraminifera: chambered tests, calcareous or agglutinated (e.g., \textit{Miliammina, Cibicides, Guembelitria}).
- Diatoms (e.g., \textit{Triceratium}) have siliceous frustules and are not forams.

Answer 1

The Correct Option is A, C, D

Step 1: Identifying foraminifera.
Foraminifera are unicellular protists with chambered calcareous, agglutinated, or organic-walled shells (tests). They are widely used in biostratigraphy and paleoenvironmental studies. Step 2: Evaluating the given taxa.
- (A) \textit{Miliammina}: A benthic foraminifer with agglutinated tests.
- (B) \textit{Triceratium}: A genus of diatoms (siliceous microalgae), not foraminifera.
- (C) \textit{Cibicides}: A common benthic calcareous foraminifer.
- (D) \textit{Guembelitria}: A planktonic foraminifer, significant in K–Pg boundary studies.
Step 3: Final Answer.
Thus, the foraminiferal genera among the options are: \[ \boxed{\text{(A) Miliammina, (C) Cibicides, (D) Guembelitria}} \]