The present study has focused on Palmatolepis, the biostratigraphically most important conodont genus in the Late Devonian. The studied materials produced from the both stratotype section of the Shishtu Formation, eastern Iran, in the Ozbak-Kuh Mountains and sections at Howz-e-Dorah and from the intervening Niaz area.
Thirty species and subspecies of Palmatolepis have been produced: nine from the Ozbak-Kuh Mountains, thirteen from the Howz-e-Dorah section, and twenty two from small sections in the intervening Niaz area. Only Famennian forms of Palmatolepis were encountered in the Ozbak-Kuh Mountains, but the other two areas produced both Frasnian and Famennian species of Palmatolepis.
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