Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China.
Evol Dev. 2011 Sep-Oct;13(5):408-14. doi: 10.1111/j.1525-142X.2011.00499.x.
The Ediacaran fossil Eoandromeda octobrachiata had a high conical body with eight arms in helicospiral arrangement along the flanks. The arms carried transverse bands proposed to be homologous to ctenophore ctenes (comb plates). Eoandromeda is interpreted as an early stem-group ctenophore, characterized by the synapomorphies ctenes, comb rows, and octoradial symmetry but lacking crown-group synapomorphies such as tentacles, statoliths, polar fields, and biradial symmetry. It probably had a pelagic mode of life. The early appearance in the fossil record of octoradial ctenophores is most consistent with the Planulozoa hypothesis (Ctenophora is the sister group of Cnidaria + Bilateria) of metazoan phylogeny.
埃迪卡拉纪化石 Eoandromeda octobrachiata 具有一个高圆锥形的身体，身体侧面有八个呈螺旋状排列的臂。这些臂上带有横向带，被认为与栉水母栉板同源。Eoandromeda 被解释为早期的栉水母干群，其特征为栉板、栉列和八辐射对称，但缺乏干群的特征，如触手、平衡石、极区和二辐射对称。它可能具有浮游生活方式。八辐射栉水母在化石记录中的早期出现，最符合后生动物系统发育的“扁平动物假说”（栉水母是刺胞动物门+两侧对称动物的姐妹群）。
