Eoandromeda and the origin of Ctenophora
Article first published online: 20 SEP 2011
© 2011 Wiley Periodicals, Inc.
Evolution & Development
Volume 13, Issue 5, pages 408–414, September/October 2011
How to Cite
Tang, F., Bengtson, S., Wang, Y., Wang, X.-l. and Yin, C.-y. (2011), Eoandromeda and the origin of Ctenophora. Evolution & Development, 13: 408–414. doi: 10.1111/j.1525-142X.2011.00499.x
- Issue published online: 20 SEP 2011
- Article first published online: 20 SEP 2011
- Key Laboratory of Stratigraphy and Paleontology, Chinese Academy of Geological Sciences. Grant Numbers: JB0705, JB0902
- Institute of Geology, Chinese Academy of Geological Sciences. Grant Number: J0716
- State Key Laboratory of Palaeobiology and Stratigraphy. Grant Number: 103104
- China Geology Survey. Grant Numbers: 1212011120140, 1212010611802
- National Natural Science Foundation of China. Grant Number: 40672022
- Swedish Science Research Council. Grant Number: 2007-4484
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.