Theria is the closest connection between marsupials and
placentals. It includes all mammals besides the monotremes.
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Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Subclass: Theria
Infraclass: Eutheria
Order: Artiodactyla
Family: Suidae
Subfamily: Suinae
Genus: Sus
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Pigs belong to the genus sus, the subfamily suinae, and the
phylum chordata. Pigs also belong to the subclass theria, the
eutheria infraclass, the artiodactyla order, and the Animalia
kingdom.