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Polycystinea

Polycystinea
Radiolarian.png
Polycystine skeleton
Scientific classification
(unranked): SAR
(unranked): Rhizaria
Phylum: Retaria
Subphylum: Radiozoa
Class: Polycystinea
Ehrenberg, 1838, emend. Haeckel, 1887
Orders

Spumellaria
Nassellaria


Spumellaria
Nassellaria

The polycystines are a group of radiolarians. They include the vast majority of the fossil radiolaria, as their skeletons are abundant in marine sediments, making them one of the most common groups of microfossils. These skeletons are composed of opaline silica. In some it takes the form of relatively simple spicules, but in others it forms more elaborate lattices, such as concentric spheres with radial spines or sequences of conical chambers.


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Wikipedia

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