Macrorhizodus nolfi

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A very rare, early Macrorhizodus nolfi upper jaw, lateral tooth from Aktulagay, western Kazakhstan. Macrorhizodus nolfi is a Lamnidae shark and an early Mako shark (Isurus praecursor) relative in this early Eocene deposit. The side cusps are complete. No repair. Authenticity guaranteed. Perfect tooth.

K572         SIZE: 3/4"

Note - Adding 18 Kazakh Auriculatus or transition teeth in April 2020. -->  Link to Kazakh Auriculatus teeth.

This catalog contains excellent teeth from an extinct Lamnidae shark - Macrorhizodus nolfi  

Aktulagay site - I will post a very limited amount of rare teeth from the original early Eocene site (Ypresian), Tolagaysor Fm., Aktulagay, western Kazakhstan. The Tolagaysor Fm. at this site contains O. obliquus (non-serrated) teeth at the lowest levels ( Level 0-2), O. auriculatus teeth at the upper levels (Level 6), and semi-serrated transition teeth found in between (Levels 3-5).It is the only place on earth that contains this evolutionary story in one hill side.I will attach the paper.

The Evolutionary Path to Megalodon - transition from the non-serrate Otodus obliquus to the fully serrated Auriculatus tooth - The Kazakhstan early Eocene sediments are one of the few places in the world where the transition to the fully serrated Auriculatus tooth can be observed and collected.  The  transition teeth representing the progression from Otodus obliquus (non serrate) to the Auriculatus are as follows.

Carcharocles mugodzharicus or Otodus mugodzharicus - has very fine serrations covering lower 2/3s of the crown (sometimes the serrations can be the wavy "Escheri-like" serrations) and little to no side cusp serrations. 

Carcharocles aksuaticus or Otodus aksuaticusa semi-serrated or finely serrated tooth that can have moderate sized serrations at the base of the crown. The side cusps will have few serrations.

Other Kazakhstan sites - These teeth are very rare, early Eocene (Ypresian) in age (approx. 55 mya) from Kzil-Orda region in western Kazakhstan (new location). Note - this location has been collected for ~3 summers and it is now exhausted. This is the last of the material from this site that made it to US. Some incredibly rare teeth are posted.