†Eoses triassicaTindale 1945 (disputed) Mesochorista proavita is an extinct species of scorpionfly from the Triassic period of Queensland, Australia.

The fossils were recovered from the Denmark Hill Insect Bed of Queensland, Australia.

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.

[2] Specimens of Eoses triassica, sometimes considered a synonym of this species, were discovered in 1945 by the Australian entomologist Norman Tindale from the Mt.

[4][1] Citing morphological differences in wing venation and publishing errors, Norman B. Tindale challenged this conclusion in 1980.