Specimens of Mesochorista proavita were first described by the English-Australian entomologist Robert John Tillyard in 1916.
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Specimens of Eoses triassica, sometimes considered a synonym of this species, were discovered in 1945 by the Australian entomologist Norman Tindale from the Mt. Crosby Insect Bed of Queensland, Australia.
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The type locality belongs to the Blackstone Formation (Ipswich Coal Measures Group) and is dated to the Carnian age (228.0 - 216.5 million years ago) of the Triassic period.