Abstract
A large new edrioasteroid genus from the Seifen Formation (Lower Devonian, Germany), Seifenia gen. nov., is introduced. The type species, S. ostara sp. nov., is described and figured, and its systematic position is discussed. Seifenia shows a highly derived evolutionary position in comparison with other Lower Devonian genera. With a diameter up to 57 mm, it is the largest known domal genus of the Agelacrinitidae. Most specimens of S. ostara are not found in contact with the substrate. Possible reasons for this phenomenon are discussed. Furthermore, synecological interactions of Seifenia with brachiopods and auloporid corals are documented.
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