Abstract
SUMMARY We compare and contrast the morphological and molecular features of six chlorarachniophyte strains, and examine their evolutionary origins. Electron microscopical studies of nucleomorphs and chloroplasts, characterization of nucleomorph karyotypes, and phylogenetic analyses of small subunit ribosomal RNA (srRNA) genes derived from the nucleomorph and host cell genomes have been used to separate the six strains into three distinct groups. One group, dubbed the‘beast group’, contains the strains Chlorarachnion sp. 242, Chlor-arachnion sp. 621, Chlorarachnion sp. 1408 and Chlorarachnion sp. 1481. Members of the beast group have a novel flagellate form and are apparently picoplank-tonic. The other two groups currently contain only one species each: Chlorarachnion reptans and Lotharella sp. 240. All chlorarachniophyte nucleomorphs examined house three small linear chromosomes each furnished with telomeres and srRNA genes.
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