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SUMMARY Archaea form one of the three primary groups of extant life and are commonly associated with the extreme environments which many of their members inhabit. Currently, the Archaea are classi¢ed into two king- doms, Crenarchaeota and Euryarchaeota, based on phylogenetic analysis of ribosomal RNA (rRNA) sequences. Molecular techniques allowing the retrieval and analysis of rRNA sequences from diverse envir- onments are increasing our knowledge of archaeal diversity. This report describes the presence of marine Archaea in north-east Atlantic waters. Quantitative estimates indicated that the marine Archaea constitute 8% of the total prokaryotic rRNA in Irish coastal waters. Phylogenetic analysis of the archaeal rRNA gene sequences revealed su⁄cient genetic diversity within Archaea to indicate that the current two-kingdom classi¢cation of Crenarchaeota and Euryarchaeota is restrictive.

Phylogenetic analysis of Group I marine archaeal rRNA sequences emphasizes the hidden diversity within the primary group Archaea