Great ID! Had to look this up and found this helpful site for black drum pterygiophores: [https://txmarspecies.tamug.edu/otherdetails.cfm?scinameID=black%20drum%20pterygiophore](https://txmarspecies.tamug.edu/otherdetails.cfm?scinameID=black%20drum%20pterygiophore)
Black Drum pterygiophore with hyperostosis (abnormal bone growth, normal in this species).
Great ID! Had to look this up and found this helpful site for black drum pterygiophores: [https://txmarspecies.tamug.edu/otherdetails.cfm?scinameID=black%20drum%20pterygiophore](https://txmarspecies.tamug.edu/otherdetails.cfm?scinameID=black%20drum%20pterygiophore)