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Most primitive primate
Lemur
 
Lemurprimitiveprimate8
 
Most primitive mollusc
Chaetoderma
 
chaetoderma intermedium
 
Most primitive Arthropod
Peripatus
 
peripatusprimitiveArthropod2
 
Most primitive Annelida
Polygordius
 
Polygordiusprimitiveannelida1
 
Most primitive fish
Climatius
 
Climatiusprimitivefish1
 
Most primitive Helminth
Planaria
 
PlanariaprimitiveHelminth1
 
Most primitive reptile
Sphenodon
 
primitivereptileSphenodontuatara2
 
Most primitive Mammal
Echidna
 
echidnaprimitivemammal1
 
Most primitive Ape
Gibbon
 
Gibbonprimitiveape1

Dictionary:

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