Stylosphaeridae 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 spherical central capsule within a fenestrated spherical siliceous shell, with two radial spines opposite in one axis. They are solitary. i.e. not associated in colonies. Wikisource:Report on the Radiolaria/Sphaeroidea#121

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External links

File:Stylosphaera coronata laevis, Ehrenberg 1873 - Radiolarian - 400x (30333222325).jpg, ''Stylosphaera coronata laevis'' File:Stylosphaera_melpomene.jpg, ''Stylosphaera melpomene'' Polycystines Radiolarian families {{Radiolarian-stub