" ▁but ▁this ▁has ▁remained ▁a ▁nom en ▁n ud um . ▁The ▁spec imen ▁is ▁likely ▁one ▁individual , ▁located ▁in ▁the ▁same ▁str ati agraph ic ▁position ▁as ▁the ▁hol ot yp ic ▁spec imen . ▁Unfortunately , ▁there ▁are ▁few ▁available ▁over la pping ▁elements ▁from ▁the ▁spec imen ▁and ▁the ▁Hol ot ype . ▁Both ▁spec im ens ▁preserve ▁a ▁relatively ▁complete ▁fem ur : ▁however , ▁the ▁features ▁of ▁both ▁( an ▁an ter omed ial ly ▁directed ▁head , ▁a ▁relatively ▁long ▁fourth ▁tro chan ter ▁and ▁a ▁tro chan ter ic ▁sh elf ) ▁are ▁pl esi omorphic ▁and ▁thus ▁do ▁not ▁indicate ▁cons pec if ity ▁or ▁cla de ▁membership . ▁It ▁is ▁noted , ▁however , ▁that ▁there ▁are ▁no ▁features ▁which ▁are ▁present ▁in ▁one ▁spec imen ▁but ▁not ▁the ▁other . ▁ ▁Andrew s ▁originally ▁assigned ▁S arc osa urus ▁to ▁the ▁Meg al osa ur idae . ▁The ▁first ▁to ▁suggest ▁a ▁more ▁bas al ▁position ▁was ▁Samuel ▁Paul ▁W elles ▁who ▁placed ▁it ▁in ▁the ▁Co el oph ys idae . ▁Later ▁anal ys es ▁resulted ▁in ▁either ▁a ▁position ▁in ▁the ▁Cer at osa uria , ▁or ▁in ▁the ▁Co el oph y so idea . ▁Ez cur ra ▁( 2 0 1 2 ) ▁found ▁S arc osa urus ▁to ▁be ▁the ▁most ▁bas al ▁cer at osa ur ▁in ▁a ▁large ▁un pub lished ▁analysis .. ▁In ▁ 2 0 1 8 , ▁Andrea ▁C au ▁in