Phylogenetic relationships and evolutionary patterns of the order Collodaria (Radiolaria).

PloS One
Yoshiyuki IshitaniKozo Takahashi

Abstract

Collodaria are the only group of Radiolaria that has a colonial lifestyle. This group is potentially the most important plankton in the oligotrophic ocean because of its large biomass and the high primary productivity associated with the numerous symbionts inside a cell or colony. The evolution of Collodaria could thus be related to the changes in paleo-productivity that have affected organic carbon fixation in the oligotrophic ocean. However, the fossil record of Collodaria is insufficient to trace their abundance through geological time, because most collodarians do not have silicified shells. Recently, molecular phylogeny based on nuclear small sub-unit ribosomal DNA (SSU rDNA) confirmed Collodaria to be one of five orders of Radiolaria, though the relationship among collodarians is still unresolved because of inadequate taxonomic sampling. Our phylogenetic analysis has revealed four novel collodarian sequences, on the basis of which collodarians can be divided into four clades that correspond to taxonomic grouping at the family level: Thalassicollidae, Collozoidae, Collosphaeridae, and Collophidae. Comparison of the results of our phylogenetic analyses with the morphological characteristics of each collodarian family sugges...Continue Reading

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Citations

Jan 23, 2014·European Journal of Protistology·Tomoko Yuasa, Osamu Takahashi
Oct 10, 2015·The ISME Journal·Massimo C PerniceRamon Massana
Oct 1, 2015·Biological Reviews of the Cambridge Philosophical Society·Moriaki YasuharaBoris Worm

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Datasets Mentioned

BETA
AY266295
AY266296
AF091146
AF091147
AB613246
AB690556
AB613245
AF018162
AB690557
AF018163

Methods Mentioned

BETA
PCR

Software Mentioned

CLUSTALX
MrBayes
PAML
Thornian Time Traveler
MrBayes3
MrModeltest
T3
estbNew
multidivtime
Treefinder

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