The thin white filament, approximately the size of a human eyelash, is “by far the largest bacterium known to date,” said Jean-Marie Volland, a marine biologist at the Lawrence Berkeley National Laboratory and co-author of a paper announcing the discovery Thursday in the journal Science.
Olivier Gros, a co-author and biologist at the University of the French West Indies and Guiana, found the first example of this bacterium — named Thiomargarita magnifica, or “magnificent sulfur pearl” — clinging to sunken mangrove leaves in the archipelago of Guadeloupe in 2009. But he didn’t immediately know it was a bacterium because of its surprisingly large size, just over a third of an inch long. Only later genetic analysis revealed the organism to be a single bacterial cell.
“It’s an amazing discovery,” said Petra Levin, a microbiologist at Washington University in St Louis, who was not involved in the study. “It opens up the question of how many of these giant bacteria are out there — and reminds us we should never, ever underestimate bacteria.”Scientists have not yet been able to grow it in lab culture, but the researchers’ say the cell has a structure that’s unusual for bacteria.
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