Haikouichthys

Summary
Haikouichthys was a primtive fish that lived during the cambrian period, about the same time as anomalocaris, and probably fed on the wounded of these in large shoals.

Appearance
It lived in China, and was about the size of an adult thumbnail (2.5 cm). It had a disticnt head and tail, with 6-9 gills running down the neck area. it is cosely related to other agnathans such as lamreys and Myllokunmingia.