|Named By:||Luo, et al 1999|
|Time Period:||535-520 Ma|
|Location:||China, Qiongzhusi Formation|
|Fossil(s):||One preserved specimen|
|Classification:||| Chordata | Craniata | Agnatha ||
Haikouichthys is an extinct genus of craniate (animals with notochords and distinct heads) believed to have lived 525 million years ago, during the Cambrian explosion of multicellular life. Haikouichthys had a defined skull and other characteristics that have led paleontologists to label it a true craniate, and even to be popularly characterized as one of the earliest fishes. Cladistic analysis indicates that the animal is probably a basal chordate or a basal craniate; but it does not possess sufficient features to be included uncontroversially even in either stem group.