Not Negaprion, a Carcharhinus species. It needs to be cleaned to obtain a better ID.

Genus is capitalized, species is not. Scapanorhynchus texanus

Striatolamia macrota

Not Cane River formation (Eocene) probably Pleistocene or Pliocene, appears to be a reworked bull shark (Carcharhinus leucas).

Cane River is way too old for C. taurus – Carcharias sp.

Tiger shark. Galeocerdo latidens

Hypotodus verticalis

The wear on the cusplets make it hard to positively id. Could be Cretalamna appendiculata or possibly something else.

Striatolamia macrota

Cretalamna appendiculata

Prob Serratolamna koerti

Looks like Serratolamna koerti

Might be Carcharias or Odontaspis reticulata but would need to see the other side of the tooth to make sure.

The tooth is worn, which is why the serrations are missing.

A drop or two of vinegar would tell if it is limestone. It would fizz.

Ok works for me, I don’t know jack about latin

In Microsoft picture manager which came with Office 2010, you can easily adjust pictures, change brightness and contrast and rotate or flip them. Other image editors can do the same but are usually more complicated to use.

Unfortunately there are researchers who try to change genera or species simply for little or no valid reason other than to get published.

C. cuspidata would be correct.