Domains of Life‎ > ‎Eukaryotes‎ > ‎

Protists (Chromalveolates)

Kingdom Chromalveolata

Chromalveolates are organisms that descended from an endosymbiosis event between a bikont (organism with 2 flagella) and a red alga, which became the ancestor of chlorophyll c plastids. 

Kingdom Chromalveolata or Halvaria
        Phylum Heterokontophyta - Heterokonts
            Class Oomycota - Water Molds
            Class Bacillariophyceae - Diatoms
            Class Phaeophyceae - Brown algae
    Superphylum Alveolata
        Phylum Dinophyceae - Dinoflagellates

Questions for Thought:
  • Why is the term "protist" not very useful for evolutionary studies?
  • What is the synapomorphy of the Chromalveolates? ... of the Heterokonts? ...of the Alveolates?
  • What life cycle (i.e. haplontic, diplontic, diplo-haplontic) does each group exhibit?
  • The brown algae are not closely related to land plants, but what aspect of their life cycle made past researchers assume an ancestor-descendant relationship?
  • How have the water molds impacted plants and human history?
  • Why are the diatoms so ecologically significant?
  • Why are dinoflagellates so ecologically significant?
  • What ecological niche(s) do the brown algae occupy?
Supporting websites:
Subpages (2): Alveolates Heterokonts