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nummulite| Large coin-shaped fossil composed of numerous whorls coiled in a plane spiral, the whorls being divided into chambers by septa. These, the remains of marine protozoa, are common in Tertiary rocks, particularly Eocene limestones in Egypt and elsewhere, and are valuable as index fossils. |
| Nummulites reached the maximum size for any protozoan, of around 6 cm/2.4 in diameter. |
Classification Nummulites are in genus Nummulites order Foraminiferida, class Granuloreticulosa, subphylum Sarcodina, phylum Sarcomastigophora. |
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