Аннотация:Strobilation (transverse fission of the polyp body) is a process by which scyphozoan polyp produces multiple medusa larvae (ephyrae). Unfortunately, there is an obvious lack of data concerning the morphogenetic bases of this process. Using in vivo observations, histology, electron microscopy and immunohistochemistry we studied the developing ephyra from originating of the ephyra anlage to liberating of the ephyra from the polyp.