megaplankton

Noun

 * 1) The largest plankton (greater than about 20 centimetres in maximal dimension)

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)