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Eutheria (Placental J David Archibald, San Diego State University, San Diego, California, USA
 

Summary: Eutheria (Placental
Mammals)
J David Archibald, San Diego State University, San Diego, California, USA
Eutheria includes one of three major clades of mammals, the extant members of which are
referred to as placentals.
Introduction
Eutheria (or Placentalia) is the most taxonomically diverse
of three branches or clades of mammals, the other two
being Metatheria (or Marsupialia) and Prototheria (or
Monotremata). When named by Gill in 1872, Eutheria in-
cluded both marsupials and placentals. It was Huxley in
1880 who recognized Eutheria basically as used today to
include only placentals. McKenna and Bell in their Clas-
sification of Mammals published in 1997, chose to use Pla-
centalia rather than Eutheria to avoid the confusion of
what taxa should be included in Eutheria. Others such as
Rougier have used Eutheria and Placentalia in the sense
used here. Placentalia includes all extant placentals and
their most recent common ancestor. Eutheria is retained to
include all extinct mammals that share a more recent com-

  

Source: Archibald, J. David - Department of Biology, San Diego State University

 

Collections: Biology and Medicine; Geosciences