Check out these super cool micro-CT scans of Pulleniatina:
Fabbrini et al. 2025. Morphology of Pulleniatina (planktonic foraminifera) from optical microscopy, micro-CT and SEM investigations. Journal of Micropalaeontology, 44: 213-235. doi.org/10.5194/jm-4...
Abstract. Pulleniatina is a genus of planktonic foraminifera that is widely used in biostratigraphic and palaeoceanographic studies. In our taxonomy, it comprises six morphospecies, alphabetically P. ...