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Need a scale in the image. Serrations seem awful fine for C. longimanus. With serrations and overall tooth shape, I am thinking more like Glyphis glyphis.

2X2 cm, mentioned in the dimensions. @bill-heim

Hello @drsukhendu-mukhopadhyay , you will still need to add a scalebar to your photos for us to mark it as research grade. I think the identification shouldn’t go beyond the genus Carcharhinus for this specimen. There are too many Carcharhinus species with similar teeth to be certain.

I disagree, I think it is Glyphis. It doesn’t match well for other Carcharhinids but does match for Glyphis with the serrations and the overall shape. Glyphis is found in that area. It fits well for an upper A3 tooth. I have a jaw(s) of each major Carcharhinus species that have broad teeth and it doesn’t fit well for any of them. In his original image, he had it with other teeth and it was considerably larger. I have seen and have an image of Hubble’s Glyphis glyphis and the jaw is huge along with the teeth. I also have a couple of modern upper G. glyhis teeth as well and they are also huge as large as the largest bull shark teeth. I also have a jaw of G. gangeticus and isolated teeth and the teeth are similar in shape but narrower.

The Speartooth Shark has so far only been recorded in tidal rivers and estuaries within the Northern Territory and Queensland. Within the Northern Territory the Speartooth Shark has been recorded in the Adelaide River, South, East and West Alligator Rivers, Murganella Creek and Marrakai Creek. In Queensland the Speartooth Shark has been found in the Wenlock and Ducie Rivers, Port Musgrave (the mouth of these two rivers) and the Bizant River (Stevens et al. 2005). How can this be found in India?? @bill-heim

The Copper shark and the Seven-Gill shark are only known from the Pacific. We collect multiple fossils of both here on the Atlantic coast of the US. Present known distribution records (which are incomplete) has less relevance to the fossil record.

@bill-heim👍

I like it