A living planktonic foraminifer with a multi-chambered, calcitic shell and numerous radiating spines that are attached to the surface of the shell. Algal symbionts, enclosed by the foraminferal cytoplasm that streams out of the shell, appear as golden-yellow spherules scattered along the surface of the spines.
Image source: Todd, R. 1965. The Foraminifera of the Tropical Pacific Collections of the ”Albatross”, 1899-1900. Part 4. Rotaliform families and planktonic families [End of Volume]. Bull. U.S. Nation. Mus 161: v+139 pp.+28 pls.