“Genus Difflugia. Difflugia species produce shells or tests composed of of mineral elements like sand grains and diatoms, cemented together by organic material. A promising specific character is the patterning of the organic cement. Although Difflugia species depend on the materials in their habitats, many species select and arrange the building material according to size and shape to construct a species specific shell.” —Microworld.
Newfound Amoeba Looks Just Like Gandalf the Wizard's Hat