The bacteria, <em>Ca. Thiomargarita magnifica</em>, discovered in the French Caribbean mangroves is a member of the genus <em>Thiomargarita</em>.
Enlarge / The bacteria, Ca. Thiomargarita magnifica, discovered in the French Caribbean mangroves is a member of the genus Thiomargarita.

There are tiny thread-like organisms that are visible to the naked eye and have earned the title of the largestbacteria ever known.

They are roughly the size and shape of a human eyelash, and 50 times the size of a garden-variety bacterium, making them the largest of their kind in the world. This is similar to seeing a person as tall as Mount Everest.

Views of the sampling sites among the mangroves of Guadeloupe archipelago in the French Caribbean, April-May 2022.
Enlarge / Views of the sampling sites among the mangroves of Guadeloupe archipelago in the French Caribbean, April-May 2022.

In 2009, a Biologist at the University of the Antilles noticed the prokaryotes swaying in the sulfur-rich waters of the mangroves. The leaves, branches, oyster shells, and bottles that sank into the tropical swamp were held by thebacteria.

He and his colleagues thought they were complex organisms. The research shows that each string is related to other sulfur-oxidizingbacteria. Jean-Marie Volland, a microbiologist at the Joint Genome Institute, said that it was a surprise.

This week, Gros and colleagues published an article in Science detailing everything they've learned about the new, enormousbacteria. There is a magnifica.

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Microbiologists didn't think possible, but their findings expand our understanding. Scientists believed that the size ofbacteria would be limited by a number of factors, including a lack of transport systems and a surface-to-volume ratio. The volume of one Ca. Volland said that the maximum that a bacterium can theoretically achieve is two orders of magnitude higher.

  • Filaments of Ca. Thiomargarita magnifica.
  • Filaments of Ca. Thiomargarita magnifica.
  • Filaments of Ca. Thiomargarita magnifica.
  • Filaments of Ca. Thiomargarita magnifica.

They are still learning how and why. T. magnifica is large. It's obvious that Ca. The oxidizer T. magnifica reduces nitrate in its environment. The majority of its cell volume is stored nitrate. The sac is crushing against the cell's envelope, limiting the amount of Molecules that can be diffuse.

The free-floating DNA of the bacterium tends to be different. The researchers named the pepins after small seeds in fruit because of the large number of copies of the genome they found. The distribution of pepins in the outer edges of the bacterium could allow for the production of a specific type of molecule.

Scientists need to figure out how to culture these gargantuanbacteria in labs. Every time they run out, the researchers collect new ones. This has been difficult since they seem to have a life cycle. Gros has been unable to locate any for the last two months. He did not know where they were.