The Collaborative International Dictionary
marsupian
marsupialian \mar*su`pi*a"li*an\, marsupian \mar*su"pi*an\, n. (Zo["o]l.) One of the Marsupialia.
Wiktionary
marsupian
n. (context obsolete English) marsupial
Usage examples of "marsupian".
They were vestigian but necessary, like the fangs of the marsupians who eventually evolved into Homo sapiens.