Questions about pycnodontidae

[readinghiker]

A couple of questions concerning these fish. 

 

  Are all nursallia teeth characterized by the eight or so bumps on one side of the tooth?

  Did pycnodonts regularly shed their teeth? Most of the teeth I have found are hollowed out basally, which makes me think that they were shed, I have a few that look like they have remnants of jaw fragments attached, which makes me think that these teeth belonged in the mouth of a fish that had died.

  How do you tell the difference between pycnodontid and lepidotid teeth?

 

Thanks!