Bill Heim

Lower tooth of a lemon shark

Need images of both sides

Now placed in a separate Family Aetobatidae. Also Order should be Myliobatiformes

Size and large serrations make it look like Carcharodon carcharias vice megalodon. I also don’t see remnants of the chevron shaped bourlette. Note: Specific Epithet does not include the C. Also genus is capitalized, species is not. So it should read Genus – Carcharodon. Specific epithet – carcharias – family Lamnidae). Author is (Linnaeus). Parens indicate the genus was changed from the original but the species is the same. Make changes and I will mark it as Research grade. It is from an unusual location.

Charlie, the correct genus for megalodon is Carcharocles or Otodus (not fully resolved yet). Not related to Carcharodon (great white shark).

Unusual enamel bumps on lower part of labial enamel does not fit with other Squalus (S. serriculus) from location. Larger than other Squalus I have collected from site. Either a new species or a variation due to age. Not pathologic due to lack of enamel irregularities caused by pathology.

Carcharodon is correct. I cannot do anything with Shark.sp. I can correct the names but it would be too much work. If it is close (like Isurus in this case) I will fix it, but not Shark.sp

Genus changed to Carcharodon (direct ancestor of the Great White)

Probably a silky shark (I would have to see the other side to be sure), not a tiger shark.

Lower lemon shark tooth.

3 different fossils, please only 1 fossil per page. Please delete.

Examine the blade carefully with magnification. If it has serrations (even small ones) it is not Negaprion. It looks like a lower Carcharinid possibly a bull shark lower. Also the specific epithet is never capitalized (brevirostris) only the genus (Negaprion).

Hemipristis serra, H. elongata is the modern species which lives in the Indian Ocean and Western Pacific. Correct the species name, add an image of the other side (labial side) and add the author (Agassiz) and I can mark it as research grade as you have a scale bar already included.

Lemon shark, not a thresher.

Lower tooth of a Carcharhinid, species indeterminate.

Also update Eon, Era, Period.

Eagle ray, Aetobatis sp. lower jaw file.