nummulitidae

• Существительное, обозначающее семейство ископаемых протистов, обычно характеризующихся монетовидными раковинами.

A noun referring to a family of fossil protoctists, typically characterized by their coin-shaped shells.

proper noun

1. Fossil protoctistsC2formalscientific

   A family of extinct, single-celled marine organisms with a coiled, disc-shaped shell, commonly found in limestone deposits from the Eocene epoch.

   Ископаемые протисты

   • Nummulitidae fossils are often used as index fossils for dating rock layers.
   • The limestone cliffs of the Pyramids of Giza contain abundant Nummulitidae shells.
   • Geologists study Nummulitidae to understand ancient marine environments.