The rank of " Theria " may vary depending on the classification system used.
2.
A variant of the Prototheria-Metatheria-Eutheria system is the Prototheria-Theria system.
3.
Viviparous mammals are in the subclass Theria; those living today are in the marsupial and placental infraclasses.
4.
Viviparous mammals are in the subclass Theria; those living today are in the Marsupialia and Placentalia infraclasses.
5.
"' Mammals "'are any vertebrates within the monotrema and the Theriiformes including the theria.
6.
Logically, under the Prototheria-Theria scheme, the infraclass of Prototheria corresponding to Eutheria and Metatheria should also be called Prototheria.
7.
McKenna & Bell 1997 ) prefer to maintain the name Prototheria as a fitting contrast to the other group of living mammals, the Theria.
8.
The two infraclasses of Theria in the Prototheria-Theria system may also be " Marsupialia " and " Placentalia ".
9.
The two infraclasses of Theria in the Prototheria-Theria system may also be " Marsupialia " and " Placentalia ".
10.
An analysis by Van Rheede in 2005 concluded that the genetic evidence favors the theria hypothesis, and this hypothesis continues to be the more widely accepted one.
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