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Most primitive primate
Lemur
Most primitive mollusc
Chaetoderma
Most primitive Arthropod
Peripatus
Most primitive Annelida
Polygordius
Most primitive fish
Climatius
Most primitive Helminth
Planaria
Most primitive reptile
Sphenodon
Most primitive Mammal
Echidna
Most primitive Ape
Gibbon
End of the article