Insights on the diversity within a "species" of Thalassicolla (Spumellarida) based on 16S-like ribosomal RNA gene sequencing.
We compared 16S-like ribosomal RNA (rRNA) coding regions of samples of the solitary spumellarian radiolarian Thalassicolla nucleata collected from the Sargasso Sea and the Pacific Ocean. Sequences derived from these locations showed variability in both length and base-pair composition. This level of sequence variability is similar to the degree of variability reported in the literature for species- or even genus-level distinctions. Explanations for our results include multiple alleles for the rRNA gene, or the existence of multiple species of Thalassicolla that are morphologically indistinguishable. The seven existing descriptions of Thalassicolla species, including T. nucleata, are discussed in view of these molecular findings and with reference to our current understanding of the physiology and life cycle of the spumellarian radiolaria.
Josephine Bay Paul Center in Comparative Molecular Biology and Evolution, Marine Biological Laboratory, Woods Hole, Massachusetts 02543, USA. amaral@evol5.mbl.edu
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Zettler
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Anderson
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Caron
D000818:Animals; D001483:Base Sequence; D056890:Eukaryota / Q000145:classification / Q000235:genetics*; D014644:Genetic Variation; D008969:Molecular Sequence Data; D016053:RNA, Protozoan / Q000737:chemistry / Q000235:genetics*; D012336:RNA, Ribosomal, 16S / Q000737:chemistry / Q000235:genetics*; D016415:Sequence Alignment; D012689:Sequence Homology, Nucleic Acid
D016053:RNA, Protozoan; D012336:RNA, Ribosomal, 16S