Land shark teeth

The general form of the xenocanth teeth is seen in figure A. Though they have three points, like the majority of other shark teeth (figure B), they are reversed so that the lateral spines are enlarged while the central spine is a nub.

They fit together like in figure C, overlapping their spines into the crotch of the one beside it. This gives them a surprisingly normal looking tooth row, despite the odd shape of their teeth.