Calomyxa is a genus of slime molds belonging to the family Dianemataceae. It was first described in 1916 by Fr. Julius Nieuwland

The genus has cosmopolitan distribution.

Species:

  • Calomyxa metallica (Berk.) Nieuwl., 1916
  • Calomyxa synspora M.L.Farr & Kowalski, 1974