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. 10 November 2018. <https://www.yourdictionary.com/australosphenida>.
australosphenida. (n.d.). Retrieved November 10th, 2018, from https://www.yourdictionary.com/australosphenida
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