After publication of this work , we found that we inadvertently included an incomplete list of all co-authors. A full list of authors and affiliations including Hiromichi Nagasawa, Yoshihiro Fujiwara and Shinji Tsuchida has been added.
Accordingly, some parts in "Samples and DNA preparation" of Methods, Authors' contributions and Acknowledgements have been revised as follows:
Samples and DNA preparation
One specimen of Shinkaia crosnieri was used for the experiments. Sampling was conducted using a suction sampler with multiple canisters installed on the ROV Hyper-Dophin belonging to the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) on Apr 24, 2005. [The followings are the same.]
J-SY designed and performed the experiments, analyzed the data, and wrote the paper. HN participated in DNA preparation. YF and ST collected the materials. W-JY directed the research and paper writing. All authors contributed to the manuscript and then read and approved the final version.
We thank Chris Wood of Zhejiang University for critical reading of this manuscript. This work was supported by the National Natural Sciences Foundation of China (40730212) and "863" program of China (2007AA09Z426).