A new study has found that Trichodesmium or “sea sawdust,” a genus of oceanic bacteria described by Captain Cook in the eighteenth century and so prolific it can be seen from space, has a unique, lineage-specific genome. Less than two-thirds of the genome of this crucial ammonium-producing bacteria codes for proteins. No other such bacteria has such a low value, and conversely such a large percentage of the genome that is non coding. This lineage-specific genome, as one report explains, “defies common evolutionary dogma.” Read more