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Review of Marmasoma White with lectotype designation of M. sumptuosum White and an identification key to the Australasian/Oceanian genera of Ecliminae (Diptera, Bombyliidae).

The bombyliid genus Marmasoma White is restricted to Australia. Marmasoma sumptuosum White, the only known species of the genus, is studied and a lectotype and paralectotypes are designated. Based on the type series and on additional material, a redescription of the species is presented and the main characters of the external morphology of adults are illustrated and photographed, including male and female genitalia. In addition, the remarkable aedeagus of M. sumptuosum, unique among all Ecliminae species by the presence of serrated projections on its apical portion, is described and photographed in detail for the first time. An identification key to the Australasian/Oceanian genera of Ecliminae and a distribution map with the known geographic records of Marmasoma are also included.