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Here are two jaws that I recently acquired. One jaw, Jaw 1, is 3.5” wide and 2.5” inches high. The other jaw, Jaw 2 is 2.5” wide and 1.625” inches high. They both were sold as Centrophorus granulosus (Gulper Shark) jaws. However, when you see the pictures below, you will see that there is a very noticeable difference in tooth morphology between the jaws. Centrophorus can display both ontogenetic heterodonty and sexual dental heterodonty. One jaw is noticeably bigger than the other so juvenile/adult tooth differences could be what is being seen or possibly male/female differences. Here are the overall jaws: Jaw 1 Jaw 2 To better see tooth details double clique the below pictures. If you mouse over the pictures you will see the file name which has additional positional information. Note that Centrophorus teeth interlock in both the upper and lower jaws and that the lower teeth can be serrated. Upper jaw symphysis: Jaw 1 Jaw 2 Lower jaw symphysis: Jaw 1 Jaw 2 Centrophorus can have both upper jaw and lower jaw medial teeth. Upper jaw medial teeth. Note Jaw 1 has a medial tooth (red) and there are three teeth in the symphysis. Jaw 2 has two teeth in the symphysis and doesn’t appear to have a medial tooth. Jaw 1 Jaw 2 Continued in the next reply: Marco Sr.