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What largest bacterium of \(\gt\) 600 µm size is known to inhabit the gut of Acantharus nigrofuscus ?

  • A.Vibrio fischeri
  • B.Spirillum volutans
  • C.Epulopiscium fishelsoni
  • D.Borrelia burgdorferi

Answer: C

The giant gut bacterium is Epulopiscium fishelsoni.

Epulopiscium lives in the intestine of the brown surgeonfish Acanthurus nigrofuscus (printed 'Acantharus') and can exceed 600 µm in length, large enough to see with the naked eye. It was first taken for a protist before being identified as a bacterium.

Vibrio fischeri is a bioluminescent symbiont of squid. Spirillum volutans is a large spiral bacterium, but only tens of micrometres long. Borrelia burgdorferi is the spirochaete that causes Lyme disease.

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