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the etymology of the genus comes from the greek “osteon” = bone and “rygcos” = beak, due to the bony jaws, very much advanced and jagged, which take the place of the teeth.
l’etimologia del genere viene dal greco “osteon” = osso e “rygcos” = becco, per le mascelle ossee, molto avanzate e seghet- tate, che rimpiazzano i denti.
