This vertebra has a bulb-like (hollow) structure on the ventral surface. Not sure what type of bone it is, seems solid like a marine mammal, but not sure. Any idea of the type of animal it came from, or of the possible function of the bulb-like structure?
Hi, not sure of species but it may well be a Jack - family Carangidae. Several species in the family have these swollen spines, jury is still out as to exactly why, and why some species and not others. Some have this hyperostosis in the head as well. Some people call them Tilly bones, and I have seen them called 'mice' (depending on the type if they break off you get a blob and a tail!).