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Odontaspis or Jaeckelotodontid???

Anomotodon

Unidentified lamnoid anterior


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Eocene vertebrates of Ukraine

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16 minutes ago, non-remanié said:

very nice tooth. I would say Jaekolotodus for sure  

Thanks! Jaekelotodus anteriors are more robust and have shorter cusplets. Jaekelotodus trigonalis is a relatively common species in Kiev.  There are more genera in Jaekelotodontidae though, like Mennerotodus or others. However it also might be an extraordinary large Odontaspis/or its relative. I am confused about this tooth.

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I was thinking that it looks more like the slightly older Jaekolotodus robustus.  Does the site have a mixture of Ypresian, Lutetian and Bartonian material?  I agree that it is definitely not  J. trigonalis.   Or it also could be Mennerotodus, but i am much less familiar with them.  

 

I do have a very similar problem regarding the Eocene of New Jersey.   I have found it gets quite difficult to differentiate anterior Odontaspis winkleri from  anterior sub-adult J. robustus that I collect.   

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J. robustus anterior crowns are still robust and have smaller cusplets... And it's Thanethian, while Kiev deposits are Eocene. I lean more towards Mennerotodus or Odontaspis anterior.

Odontaspis winkleri is very often used as a 'wastebasket' taxon. Eocene sand tigers definitely require some revison :meg: (both Odontaspididae and Jaekelotodontidae and genera that are classified into different families by different authors, like Striatolamia)

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robustus is also found in Ypresian stage of the Eocene.  It could also be that there are very slight differences between thanetian and ypresian robustus.    Also some sites yield mostly adult large specimens and some sites  have plenty of sub-adult which can magnify the easily observable differences in very closely related species.

 

 

i believe one of the common problems with the Eocene sand tigers is often a lack of stratigraphic resolution at many sites.  Many deposits and sites yield a variety of ages of Eocene material and likely contain a mix of very similar species within a genera. 

 

 

 

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