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Published 1981
Passing now into the realm of fish with bones, we come first to the order Acipenseriformes and the family Acipenseridae. This is the family of the sturgeon, huge partly armoured fish which present a somewhat prehistoric appearance. This fish is in fact a survivor from the very remote past. Moreover it is equipped inside with a skeleton which is only partly bone, and partly cartilaginous, and not many fish can boast such an unusual arrangement.
