Mesochorista proavita
Mesochorista proavita is an extinct species of scorpionfly from the Triassic period of Queensland, Australia.
Discovery
Specimens of Mesochorista proavita were first described by the English-Australian entomologist Robert John Tillyard in 1916. The fossils were recovered from the Denmark Hill Insect Bed of Queensland, Australia. The type locality belongs to the Blackstone Formation and is dated to the Carnian age of the Triassic period.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. They are also dated to the Carnian age.
Taxonomy
M. proavita belongs to the family Permochoristidae of the scorpionflies.E.F. Riek synonymized Eoses triassica with M. proavita in 1955, regarding it as a second specimen. In doing so, he identified the fossil as a mecopteran rather than a lepidopteran as it was originally described as. Citing morphological differences in wing venation and publishing errors, Norman B. Tindale challenged this conclusion in 1980. He maintains that the three known specimens of Eoses triassica belong to the lepidopteran family Eocoronidae.