Polycystine

Polycystinea

Polycystine skeleton
Scientific classification
(unranked):	SAR
(unranked):	Rhizaria
Phylum:	Retaria
Subphylum:	Radiozoa
Class:	Polycystinea
Orders
Spumellaria Nassellaria

The polycystines are a group of radiolarian protists. 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.

An illustration of polycystines of the subclass Spumellaria, from Ernst Haeckel's 1904 Kunstformen der Natur (Artforms of Nature)

References

Systematics of the Radiolaria

Wikispecies has information related to: Polycystinea

Rhizaria

Domain: Archaea; Bacteria; Eukaryota
(Kingdom: Plant; Hacrobia; Heterokont; Alveolata; Rhizaria; Excavata; Amoebozoa; Animal; Fungi)

Cercozoa

Filosa

Monadofilosa

Imbricatea	Euglyphida (T): Cyphoderiidae Euglyphidae Paulinellidae Trinematidae Thaumatomonadida (F): Thaumatomastigidae

Thecofilosea	Cryomonad (F) Ebriidae (F) Phaeodarea (A) Tectofilosid (T) Cryptodifflugia (T)

Spongomonadea (F)	Spongomonas, Rhipidodendron

Sarcomonadea	Cercomonadida (F/A): Cercomonadidae Heteromitidae Sainouridae

Reticulofilosa

Granofilosea	Limnophilida Leucodictyida Heliomonadida (H/F) Desmothoracida (H) Gymnosphaerida (H)

Chlorarachnea (A)	Chlorarachnion Gymnochlora Lotharella Cryptochlora Bigelowiella

Endomyxa

Proteomyxidea	Reticulosida (A) Aconchulinida (A): Vampyrellidae Pseudosporida (P)

Phytomyxea (P)	Phagomyxida Plasmodiophorida

Gromiidea (T)	Gromida

Ascetosporea (P)	Haplosporida Paramyxida Claustrosporida Paradinida

Retaria

Foraminifera (A)	Allogromiida Miliolid Textulariida

Radiolaria (A)	Polycystinea Acantharea Taxopodida (H): Sticholonche

Organization: F: flagellates; A: amoebae; T: testate amoebae; H: heliozoans; P: parasites.

External links

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