1.

The first lower jaw of a ctenacanthid shark from the Late Devonian (Famennian) of Belgium ...

2.

The first lower jaw of a ctenacanthid shark from the Late Devonian (Famennian) of Belgium ...

3.

The first lower jaw of a ctenacanthid shark from the Late Devonian (Famennian) of Belgium ...

4.

The first lower jaw of a ctenacanthid shark from the Late Devonian (Famennian) of Belgium ...

5.

The first lower jaw of a ctenacanthid shark from the Late Devonian (Famennian) of Belgium ...

1.

The first lower jaw of a ctenacanthid shark from the Late Devonian (Famennian) of Belgium