This clade was left unranked by the proposers, who do not apply Linnaean hierarchy. It was arguably defined only in order to contain Monotremata and Ausktribosphenida.
"australosphenida." YourDictionary, n.d. Web. 15 September 2018. <http://www.yourdictionary.com/australosphenida>.
australosphenida. (n.d.). Retrieved September 15th, 2018, from http://www.yourdictionary.com/australosphenida
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