Mariomella is similar to Hillieria and Pseudaelia, but the shape of the anterolateral angles of the pronotum, relatively wide and oriented anteriorly, differ from these two genera (Faúndez and Rider 2019).
Faúndez E.I. and Rider D.A. (2019) A new genus and new species of Aeptini (Hemiptera: Heteroptera: Pentatomidae: Pentatominae) from Australia. Zootaxa 4658, 189–192.