Polycystine: Definition from Answers.com

Polycystinea

Polycystine skeleton
Scientific classification
Domain:	Eukarya
Kingdom:	Rhizaria
Phylum:	Radiolaria
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

SAR: Rhizaria

Cercozoa

Filosa

Monadofilosa

Imbricatea	Euglyphida: Cyphoderiidae (Cyphoderia) · Euglyphidae (Euglypha) · Paulinellidae (Paulinella) · Trinematidae (Trinema) Thaumatomonadida: Thaumatomastigidae (Gyromitus, Protaspis, Thaumatomonas, Thaumatomastix)

Thecofilosea	Cryomonad (Cryothecomonas) · Ebriidae (Ebria) · Phaeodarea (Aulosphaera) · Tectofilosid (Pseudodifflugia) · Cryptodifflugia

Spongomonadea	Spongomonas, Rhipidodendron

Cercomonadida	Cercomonadidae (Cercomonas, Eocercomonas, Helkesimastix, Paracercomonas, Massisteria) · Heteromitidae (Bodomorpha, Heteromita) · Sainouridae (Sainouron, Cholamonas)

Reticulofilosa

Proteomyxidea	Gymnophryid (Gymnophrys, Borkovia) · Dimorphid (Dimorpha) · Desmothoracida (Clathrulina, Hedriocystis) · Gymnosphaerida

Chlorarachniophyta	Chlorarachnion, Gymnochlora, Lotharella, Cryptochlora, Bigelowiella

Endomyxa

Phytomyxa/Plasmodiophorida (Spongospora, Plasmodiophora)

Vampyrellidae/Aconchulinida (Arachnula, Platyreta)

Pseudospora

Ascetosporea: Paramyxea (Marteilia) · Haplosporidia (Haplosporidium, Urosporidium)

Gromiidae (Gromia)

Reticulosida

Retaria

Foraminifera	Allogromiida (Allogromia) · Miliolid (Alveolinella) · Textulariida (Textularia)

Radiolaria	Polycystinea (Didymocyrtis, Siphonosphaera) · Acantharea (Acanthometridae) · Sticholonchea (Sticholonche)

External links

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		Dictionary. Webster 1913 Dictionary edited by Patrick J. Cassidy Read more
		Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Polycystine". Read more