A new conocoryphid trilobite from the Lower Cambrian of the Flinders Ranges, South Australia

A new species of conocoryphid trilobite, Atops rupertensis, is described from the upper part of the Lower Cambrian Hawker Group of the Flinders Ranges, South Australia. Atops has not been previously described from Australia. The specimens described herein represent the most detailed material yet available for the genus; a new generic diagnosis is given. It is suggested that Ivshiniellus Korobov is a synonym of Atops; the material described as Ivshiniellus briandailyi from the Heatherdale Shale near Adelaide probably belongs in Atops. It is possible that Atopina Korobov is a synonym of Pseudatops Lake.