Kingdom      Animalia            (animal)
Phylum       Chordata            (notocord)
Subphylum    Verterbrata         (spine and verterbrai)
Class        Mammalia            (mammal)
Order        Proboscidea
Family       Paleomastodontidae  (most branches extinct)
Family       Gomphotheridae      (most branches extinct)
Family       Elephantidae        (modern)