Trilobites
cambrian-ordovican diverse -> Silurian devonion less -> after NOT diverse -> eig fout, uitgestorven in massa exctinctie, geen idee welke
chelicerates
Silurian and Devonian dom - recent
euthycarcinoids
late Cambrian
crustaceans
cambrian
Eurypterides
Ordovicum-permian (Silurian-Devonian!)
hexopoda (insects)
devonian - recent
xiphosures
Ordovician to modern
Myriapoda
Silurian - present