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Early evolutionary origin of the planktic foraminifera inferred from small subunit rDNA sequence comparisons

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Original languageEnglish
Pages (from-to)672-677
Number of pages6
JournalJournal of molecular evolution
Volume43
Issue number6
StatePublished - Dec 1996

Abstract

Phylogenetic analysis of five partial planktic foraminiferal small subunit (SSU) ribosomal (r) DNA sequences with representatives of a diverse range of eukaryote, archaebacterial, and eubacterial taxa has revealed that the evolutionary origin of the foraminiferal lineage precedes the rapid eukaryote diversification represented by the `'crown'' of the eukaryotic tree and probably represents one of the earliest splits among extant free-living aerobic eukaryotes. The foraminiferal rDNA sequences could be clearly separated from known symbionts, commensals, and food organisms. All five species formed a single monophyletic group distinguished from the `'crown'' group by unique foraminiferal specific insertions as well as considerable nucleotide distance in aligned regions.

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