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.

从Seifen形成一个新的大型edrioasteroid属（下泥盆统，德国），Seifenia根。介绍。类型种，S。ostara sp.。nov。，进行了描述和计算，并讨论了其系统位置。与其他下泥盆纪属相比，Seifenia显示出高度衍生的进化位置。它的最大直径为57毫米，是Agelacrinitidae的最大已知圆顶类。没有发现大多数葡萄球菌样品与底物接触。讨论了此现象的可能原因。此外，还记录了Seifenia与腕足动物和食足珊瑚的协同作用。