lowaphyllum (rugose coral) from the Upper Devonian of Arizona

The rugose coral genus lowaphyllum is uncommon but widely distributed in rocks of Devonian age. It is here reported for the first time from western North America (Late Devonian). lowaphyllum is also known from the late Middle and Late Devonian of Eastern North America, but the lack of Early and early Middle Devonian species anywhere in North America leaves open the question of derivation of these forms and their relationship to Early Devonian species in Europe and Australia.