Corticata ("one with a cortex"), in the classification of eukaryotes (living organisms with a cell nucleus), is a clade suggested by Cavalier-Smith to encompass the eukaryote supergroups of the following two groups: Plantae, or Archaeplastida (plants, red algae, green algae, and glaucophytes) Chromalveolata (a group including kelp, water moulds, ciliates, dinoflagellates, and other organisms)It is not clear that it is indeed a clade (that is, containing all organisms descended from a common ancestor, and no others).