A large,coin-shaped,fossil foraminifer of the genus Nummulites,widely distributed in limestone formations from the Eocene Epoch to the Miocene Epoch of the Cenozoic.

• 货币虫货币虫体形大而呈硬币状，化石有孔的虫，从始新世到新生代的中新世广泛分布在石灰岩地层中。