Posted: May 19, 2016 5:46 pm
ScholasticSpastic wrote:Ostracoderms are, I think, the oldest fish in the fossil record. They were jawless and, importantly to this diversion from the overall discussion of possible phenotypes of extraterrestrial sapient flyers (???), had three eyes. ...
Not everyone agrees that the ostracoderms left any descendants before going extinct as a group, SS.
Of course, there are different opinions about that, which may never be resolved.