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Photo Information for Megalosaur?


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Hi Tim, very nice tooth! :D anything from Russia is very special.

 

However, I don’t think this is a megalosaurid tooth. Serrations don’t end halfway up but rather go the entire length on the exterior side. Also, serrations are very fine. 

 

Not sure what it is :headscratch:but really anything from that location is neat.

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Serrations actually end exactly halfway on the mesial side, unfortunately, it was hard to take a good picture (what you might think are serrations are actually a result of not great picture quality, left pic is better). Serrations are fine though, ~3.5-4/mm on the distal side which reminds me of piatnyzkisaurids like Marshosaurus. Methriacanthosaurids like Sinraptor had ~2/mm which doesn't fit this tooth. Looks like Niger megalosaurids  were variable - Afrovenator had 3/mm but other teeth from there are ~2/mm. Assuming serration density decreases with age (and this is likely a juvenile tooth) it should fit a megalosaur like Leshansaurus from contemporary Dashanpu formation. However, I am not sure about ceratosaurids from Middle Jurassic, so Theropoda indet. will be more accurate.

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On 1/9/2019 at 8:06 PM, Anomotodon said:

Serrations actually end exactly halfway on the mesial side, unfortunately, it was hard to take a good picture (what you might think are serrations are actually a result of not great picture quality, left pic is better). Serrations are fine though, ~3.5-4/mm on the distal side which reminds me of piatnyzkisaurids like Marshosaurus. Methriacanthosaurids like Sinraptor had ~2/mm which doesn't fit this tooth. Looks like Niger megalosaurids  were variable - Afrovenator had 3/mm but other teeth from there are ~2/mm. Assuming serration density decreases with age (and this is likely a juvenile tooth) it should fit a megalosaur like Leshansaurus from contemporary Dashanpu formation. However, I am not sure about ceratosaurids from Middle Jurassic, so Theropoda indet. will be more accurate.

Ok thanks for the correction :D I was going off the picture on the right and nice job doing your research! 3.5/4 serrations/mm isn’t quite fine enough for most Ceratosaurid teeth. I think Megalosaurid then is a good fit after taking a closer look st the left photo. Ceratosaurus teeth have a serration density of around 5-6/mm so 3.5-4 would be a good fit for a Megalosaurid.

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