Despite historical treatment under the tribe Campsomerini, phylogenetic analysis revealed the genus to instead be sister to the tribe Scoliini. As a result, it was excluded from Campsomerini. Two possibilities were presented, pending results on the placement of Guigliana and Dasyscolia: either to treat a third tribe, Colpini, or to transfer the genera to Scoliini. Mitochontrial phylogenetic analysis corroborated that Colpa and Guigliana represented a third tribe, which they named Trielidini instead of Colpini to comply with ICZN guidelines.
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Krombein, Karl V. (1979). "Scoliidae". In Krombein, Karl V.; Hurd, Paul D. Jr.; Smith, David R.; Burks, B.D. (eds.). Catalog of Hymenoptera in America North of Mexico. Vol.2. Apocrita (Aculeata). Washington, D.C.: Smithsonian Institution Press. p.1316.
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Khouri, Z.; Gillung, J.P.; Kimsey, L.S. (2022). "The evolutionary history of mammoth wasps (Hymenoptera: Scoliidae)". bioRxiv10.1101/2022.01.24.474473.