Head and backbone of the Early Cambrian vertebrate Haikouichthys

@article{Shu2003HeadAB,
  title={Head and backbone of the Early Cambrian vertebrate Haikouichthys},
  author={Dan Shu and Simon Conway Morris and Jian Han and Zuo-Feng Zhang and Kinya Yasui and Philippe Janvier and Longfango Chen and Xixian Zhang and Jiang-hong Liu and Yingrui Li and H.-Q. Liu},
  journal={Nature},
  year={2003},
  volume={421},
  pages={526-529}
}
Agnathan fish hold a key position in vertebrate evolution, especially regarding the origin of the head and neural-crest-derived tissue. In contrast to amphioxus, lampreys and other vertebrates possess a complex brain and placodes that contribute to well-developed eyes, as well as auditory and olfactory systems. These sensory sytems were arguably a trigger to subsequent vertebrate diversifications. However, although they are known from skeletal impressions in younger Palaeozoic agnathans… CONTINUE READING
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