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The trilobite Thailandium solum is a large “saukiid” species known only from the Ao Mo Lae Formation of the Tarutao Group, Thailand. While the genus contains only one recognized species, Australian specimens from the Pacoota Sandstone were also assigned to it as indeterminate species by Shergold in 1991. Type material of Prosaukia misa, the type species of Prosaukia, as well as recent collections of Thailandium solum, Prosaukia tarutaoensis (Kobayashi, 1957), and a new species of Prosaukia, P. oculata, from Ko Tarutao, Thailand are used to reevaluate the generic identity of the Australian material through landmark-based morphometric analysis. The new material of Prosaukia and Thailandium, all from the Ao Mo Lae Formation, reveal that the Australian material is better characterized as Prosaukia, thus restricting the geographic range of Thailandium to Thailand and providing morphometric information by which to refine Thailandium’s generic diagnosis.