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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