Carcharhiniformes Compagno 1973
Relatively rare teeth: top predator's econiche was occupied mainly by sandsharks in Eocene.
Instead of this, carcharhiniform teeth more often are well-preserved. Maybe, due to their compactness.
The same genus. An anterior.
Another uncommon type of teeth...
Juvenile? One of the smallest non-Scyliorhinidae teeth.
Sometimes whole crown of a small tooth is semitransparent. And translucent enameloid allows to look into it's interior.
Stereolook reveals some inner details. Note dark spots at the base of the crown. Holes for vessels to enter pulp cavity?
Skin of recent Prionace glauca (Carcharhinidae) with placoid scales. Image with extended depth of field, created from 123 frames with CombineZP. A piece from somewhere near beginning of the tail, in the middle between upper and lower sides of the body. Judging by orientation of the denticles, head was at the left. A specimen from a fish shop. Quite tasty.