Retaria
| Retaria (Kladus jednoćelijskih protista supergrupe Rhizaria) | |
|---|---|
Skelet radiolarija (ø=350 µm) i ljušturica foraminifera (c, ø=400 µm) | |
| Sistematika | |
| Carstvo | Protista |
| Natkoljeno | Rhizaria |
| Koljeno | Supergrupa SAR |
| Razred | Retaria |
| |
Retaria je kladus jednoćelijskih morskih protista supergrupe Rhizaria. To su heterotrofi koje karakteriziraju ameboidi, sa zamršenim skeletima i ljušturicama, koje se, kada uginu, odlažu na morsko dno, stvarajući tako mikrofosile. Sastoji se od tri grupe:
- Acantharea,
- Polycystinea (ove dvije poznate kao Radiolaria) i
- Foraminifera.
Akantarea imaju skelet od celestita (stroncij-sulfat),[1] dok je u policistinija skelet građen od čvrstih elemenata silicijevog opala.[2] Foraminifera imaju perforirane ljušture i od karbonatnog materijala (kalcita ili rjeđe aragonita). Ameboidne ćelije emitiraju brojne projekcije protoplazmatskih nastavaka, koji u radiolarija tvore aksododija, kod foraminifers retikulopodije.
-
Radiolarijska aksopodija
-
Retikulopodija kod foraminifera
Kladogram
Foraminifera i radiolarija dio su kladusa Retaria, koji zajedno sa Cercozoa čini supergrupu Rhizaria. Radiolaria su parafiletska grupaː [3]
| Retaria |
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Reference
- ^ Decelle, J., Suzuki, N., Mahé, F., de Vargas, C., & Not, F. (2012). Molecular phylogeny and morphological evolution of the Acantharia (Radiolaria) Arhivirano 7. 3. 2016. na Wayback Machine. Protist, 163(3), 435-450.
- ^ Krabberød, A. K., Bråte, J., Dolven, J. K., Ose, R. F., Klaveness, D., Kristensen, T., ... & Shalchian-Tabrizi, K. (2011). Radiolaria divided into Polycystina and Spasmaria in combined 18S and 28S rDNA phylogeny. PloS one, 6(8), e23526-e23526.
- ^ Philippe Silar 2016, Protistes Eucaryotes.: Origine, Evolution et Biologie des Microbes Eucaryotes. 2016, 978-2-9555841-0-1. <hal-01263138>
Vanjsi linkovi
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