od us , ▁was ▁capable ▁of ▁e ating ▁a ▁wide ▁range ▁of ▁food s . ▁They ▁had ▁several ▁distinct ▁features ▁that ▁made ▁them ▁stand ▁apart ▁from ▁other ▁primitive ▁sh arks . ▁First ly , ▁they ▁had ▁two ▁different ▁types ▁of ▁teeth , ▁suggesting ▁a ▁wide ▁di et . ▁The ▁sh ar per ▁teeth ▁would ▁have ▁been ▁used ▁to ▁catch ▁sli pp ery ▁pre y , ▁while ▁the ▁fl atter ▁teeth ▁probably ▁helped ▁them ▁cr ush ▁sh elled ▁cre atures . ▁Second ly , ▁they ▁had ▁a ▁b ony ▁bla de ▁on ▁their ▁d ors al ▁fin ▁that ▁probably ▁served ▁a ▁def ensive ▁function . ▁The ▁males ▁also ▁possessed ▁cl asp ers , ▁special ized ▁org ans ▁that ▁directly ▁insert ▁s perm ▁into ▁the ▁female , ▁and ▁which ▁are ▁still ▁present ▁in ▁modern ▁sh arks . ▁ ▁The ▁young est ▁Hy b od us ▁foss ils ▁come ▁from ▁the ▁Din osa ur ▁Park ▁Form ation . ▁They ▁date ▁from ▁ 6 8 . 6 ▁to ▁ 6 6 ▁million ▁years ▁ago . ▁ ▁The ▁first ▁foss il ized ▁teeth ▁from ▁Hy b od us ▁were ▁found ▁in ▁England ▁around ▁ 1 8 4 5 . ▁Since ▁then ▁teeth ▁( and ▁d ors al ▁sp ines ) ▁have ▁been ▁recovered ▁from ▁around ▁the ▁world . ▁ ▁Species ▁Several ▁Hy b od us ▁species , ▁including ▁H . ▁but ler i , ▁H . ▁ra j kov ichi , ▁and ▁H . ▁mont an ensis , ▁were ▁later ▁re ass igned ▁to ▁Mer ist od ono