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P. contortus?


SharkySarah

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Fairly confident this is a P. contortus but would love a second opinion. From the Calvert formation. 

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Thomas.Dodson

It could be P. contortus but it also seems possible it is Galeocerdo aduncus. This is hard to tell because the differences in serrations is hard to see on a worn specimen like this. The serrations on G aduncus get more coarse as they move towards the notch and form a more distinct distal notch. Some believe that P. contortus and G. aduncus are synonymous anyway so I wouldn't agonize over it too much.

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Thomas.Dodson

@jpc I believe she is referring to Physogaleus.

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Thomas.Dodson

That looks more like a Carcharhinus sp. to me. It lacks a distal notch and the root is wrong for Physogaleus.

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will stevenson

The 2nd is a Carcharhinus the first is indeed a physogaleus as evidenced by the subtle twist in the blade 

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will stevenson
Just now, Searcher78 said:

The first tooth is a worn contortus.  The second tooth is a Carcharhinus.

Haha we posted that at exactly the same time

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1 minute ago, will stevenson said:

Haha we posted that at exactly the same time

It is always nice to get confirmation!

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Thomas.Dodson

I agree, the latest tooth is Galeocerdo.

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