Lower Cambrian vertebrates from south China

@article{Shu1999LowerCV,
  title={Lower Cambrian vertebrates from south China},
  author={De-gan Shu and Hl Luo and Simon Conway Morris and X-L. Zhang and S-X. Hu and L. Chen and J. Han and Ming Zhu and Y. Li and L-Z. Chen},
  journal={Nature},
  year={1999},
  volume={402},
  pages={42-46}
}
The first fossil chordates are found in deposits from the Cambrian period (545–490 million years ago), but their earliest record is exceptionally sporadic and is often controversial. Accordingly, it has been difficult to construct a coherent phylogenetic synthesis for the basal chordates. Until now, the available soft-bodied remains have consisted almost entirely of cephalochordate-like animals from Burgess Shale-type faunas. Definite examples of agnathan fish do not occur until the Lower… 
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An Early Cambrian tunicate from China
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A probable tunicate Cheungkongella ancestralis from the Chengjiang fauna is reported that resembles the extant ascidian tunicate genus Styela whose morphology could be useful in understanding the origin of the vertebrates.
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