According to Blackburn 1887 it is narrower and more cylindrical than Euryspilus chalcodes, with the elytra less pointed apically.

This species was described by Blackburn 1887 as Eurybia australis based on specimens (= syntypes) 'taken by Mr. J. Anderson and myself about six miles from Port Lincoln'. He distinguished it from Euryspilus chalcodes by its shape as well as differences in the ribbing and sculpturing of the elytra.

Carter 1924a considered it to be doubtfully distinct, having observed similar differences of sculpture within a series of E. chalcodes from S of Perth, and suggested the difference may be due to sexual dimorphism.