Parvamoeba
Parvamoeba rugusa, the only member of the genus so far. A very small amoeba.
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Rogerson, A. (1993). "Parvamoeba rugata n.g., n.sp., (Gymnamoebia, thecamoebidae): An exceptionally small marine naked amoeba." Eur.J.Protozool. 29: 446-452