femtoplankton

== English == === Etymology === From femto- +‎ plankton. === Noun === femtoplankton (usually uncountable, plural femtoplanktons) The plankton composed of cells smaller than 0.2 micrometers. ==== Coordinate terms ==== megaplankton (>20cm), macroplankton (2-20 cm), mesoplankton (0.2-20mm), microplankton (20-200μm), nanoplankton (2-20μm), picoplankton (0.2-2μm), femtoplankton (<0.2μm)