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Is Marsupialia a subclass or an order? I think that is an order.

Dario and Mario 21:59, 29 Nov 2004 (UTC)

It is absolutely not an order, Didelphimorphia c.s. are all separate orders. However, I think it might best be considered a "cohort" or so. Metatheria is the infraclass, and Marsupialia is that part of the infraclass which includes the real marsupials - but not deltatheroids and a few other extinct beasts. Ucucha 19:33, 6 Apr 2005 (UTC)