Kroiher M, Siefker B, Berking S
Zoological Institute, University of Köln, Germany.
Int J Dev Biol. 2000 Aug;44(5):485-90.
Polyps of Aurelia aurita can transform into several medusae (jellyfish) in a process of sequential subdivision. During this transformation, two processes take place which are well known to play a key role in the formation of various higher metazoa: segmentation and metamorphosis. In order to compare these processes in bilaterians and cnidarians we studied the control and the kinetics of these processes in Aurelia aurita. Segmentation and metamorphosis visibly start at the polyp's head and proceed down the body column but do not reach the basal disc. The small piece of polyp which remains will develop into a new polyp. The commitment to the medusa stage moves down the body column and precedes the visible onset of segmentation by about one day. Segmentation and metamorphosis can start at the cut surface of transversely cut body columns, leading to a mirror-image pattern of sequentially developing medusae.
海月水母的息肉可以通过连续细分的过程转变为多个水母体（水母）。在这个转变过程中，会发生两个在各种高等后生动物形成中起关键作用的过程：分段和变态。为了比较两侧对称动物和刺胞动物中的这些过程，我们研究了海月水母中这些过程的控制和动力学。分段和变态明显从息肉的头部开始，并沿着身体柱向下进行，但不会到达基部盘。剩下的一小段息肉会发育成一个新的息肉。向水母体阶段的转变沿着身体柱向下移动，并在可见的分段开始前约一天发生。分段和变态可以从横向切割的身体柱的切割表面开始，导致依次发育的水母体的镜像模式。
