500 Vertebrate Fish Found in Early Cambrian 01/30/2003 Where only one incomplete fossil had been known before, now 500 specimens of early Cambrian agnathan fish of the genus Haikouichthys have been reported in the Jan. 30 issue of Nature. This wealth of new fossils “reveals a series of new and unexpected features that imply a major reconsideration of several features of early agnathan evolution,” says the team of Chinese and European paleontologists. The fish appear to have had eyes, gills, and olfactory organs, and were swimmers. The authors explain the implications (emphasis added): The possession of eyes (and probably nasal...