Guitars and sawfish are the middle ground. The guitars and sawfish are classified as rays to due jaw structure.
There is a saw shark, but it's mouth is more shark like with rows of teeth than the flat grinding plates that rays and guitars have.
As for the 'evolution' of them, some biologists say the guitars may be the starting point and they split while others will say sharks to ray, and group three will tell you rays to sharks. That's the down side to science, depending on which 'facts' you use, different conclusions can be drawn.
There is a saw shark, but it's mouth is more shark like with rows of teeth than the flat grinding plates that rays and guitars have.
As for the 'evolution' of them, some biologists say the guitars may be the starting point and they split while others will say sharks to ray, and group three will tell you rays to sharks. That's the down side to science, depending on which 'facts' you use, different conclusions can be drawn.
