Kluyveromyces nonfermentans

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Kluyveromyces nonfermentans is a yeast species in the Kluyveromyces genus. It was first found in the deep sea near Honshu, Japan, from samples including marine sediment, a Calyptogena clam, and a crab. It is notable for being the only Kluyveromyces species known not to ferment glucose. In 1999, eleven strains of a previously unknown Kluyveromyces species were discovered in deep-sea samples from Suruga Bay and Sagami Bay, and K. nonfermentans was identified as the closest relative to Kluyveromyces aestuarii based on 18S rRNA gene sequences.