Spongodiscidae is a family of radiolarians in the order

Spumellaria Spumellaria is an order of radiolarians in the class Polycystinea. They are ameboid protists appearing in abundance in the world's oceans, possessing a radially-symmetrical silica (opal) skeleton that has ensured their preservation in fossil rec ...

. According to the original description by

Ernst Haeckel Ernst Heinrich Philipp August Haeckel (; 16 February 1834 – 9 August 1919) was a German zoologist, naturalist, eugenicist, philosopher, physician, professor, marine biologist and artist. He discovered, described and named thousands of new s ...

, members of the family have a flat discoidal shell, in which a simple spherical central chamber is surrounded by an irregular spongy framework.

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Polycystines Radiolarian families {{Radiolarian-stub