Age - Miocene Commonality - Abundant
The teeth of the lemon shark (Negaprion
eurybathrodon) are one of the more
common Tertiary finds in NJ. There is a marked difference in this
species between the upper
and lower teeth. Upper teeth have weak to indistinct serrations on the shoulder
which may continue part way up the crown, while
the lower teeth have an erect narrow crown and smooth shoulders. If not
worn away by stream action, a shallow nutrient grove is present. These
teeth average a little less than ˝ inch and rarely exceed 3/4 of an inch in length. Regardless of tooth position the main cusp is
perpendicular to the root, or at best, very weakly angled. These teeth
can easily be confused with those of the gray sharks (Carcharhinus).
The teeth are small with a “nail like” shape.
Left - A lower tooth with a smooth shoulder.
The main crown of the lemon has a smooth edge.