Diatoma is a genus of diatoms belonging to the family Fragilariaceae.

The genus has cosmopolitan distribution.

Species:

  • Diatoma angusticostata D.M.Williams & Z.Levkov, 2006
  • Diatoma arcuatum Lyngbye, 1818
  • Diatoma auritum Lyngbye, 1819
  • Diatoma elongata