Oncodella is most common in European outcrops corresponding to the western Tethys Ocean. It was first reported from the Someraukogel and Steinbergkogel sites near Hallstatt in Austria. At outcrops B and C of Steinbergkogel, Oncodella first occurs alongside Misikella hernsteini and morphotype A of Epigondolella mosheri. These conodonts first appear near the end of the Sevatian (late Norian), only a short time before the base of the Rhaetian. This indicates that Oncodella first evolved in the latest Norian as well. Oncodella is also known from other outcrops in the Northern Calcareous Alps. These include Dachstein reef facies at Gosausee in Austria, and the Donnerkogel Formation at Mount Hohes Brett in Germany.