The fossil material unearthed in November 1989 in Late Pleistocene and Holocene deposits on 'Eua, Lifuka, 'Uiha and Vanuatu and described in 2006 by David William Steadman include a complete femur, five radii, a quadrate bone, a mandible, a coracoid, two sterna, two humeri, two ulnae, two tibiotarsi, a carpometacarpus, a tarsometatarsus, and three pedal phalanges.

[3] The oceanic eclectus parrot became extinct on Tonga during the early settlement 3000 years ago, presumably due to human-caused factors.

On Vava'u, it may have survived into historic times because among the drawings which were created in 1793 during Alessandro Malaspina's Pacific expedition, there is one sketch which appears to portray an Oceanic eclectus parrot.

E. infectus had proportionally smaller wings than the eclectus parrot.

The species became extinct after the arrival of humans 3000 years ago, presumably due to human-caused factors (habitat loss, introduced species).