. ▁In ▁ 2 0 1 5 ▁Tsch opp , ▁Mate us , ▁and ▁B enson ▁argued ▁that ▁the ▁species ▁was ▁distinct ▁enough ▁to ▁be ▁placed ▁in ▁its ▁own ▁genus , ▁so ▁they ▁rec lass ified ▁it ▁back ▁into ▁Br ont osa urus . ▁ ▁A pat osa urus ▁par v us , ▁first ▁described ▁from ▁a ▁ju ven ile ▁spec imen ▁as ▁El osa urus ▁in ▁ 1 9 0 2 ▁by ▁Pet erson ▁and ▁Gil more , ▁was ▁re ass igned ▁to ▁A pat osa urus ▁in ▁ 1 9 9 4 , ▁and ▁then ▁to ▁Br ont osa urus ▁in ▁ 2 0 1 5 . ▁Many ▁other , ▁more ▁m ature ▁spec im ens ▁were ▁assigned ▁to ▁it ▁following ▁the ▁ 2 0 1 5 ▁study . ▁ ▁A pat osa urus ▁minim us ▁was ▁originally ▁described ▁as ▁a ▁spec imen ▁of ▁Br ont osa urus ▁sp . ▁in ▁ 1 9 0 4 ▁by ▁Os born . ▁In ▁ 1 9 1 7 ▁Henry ▁M ook ▁named ▁it ▁as ▁its ▁own ▁species , ▁A . min im us , ▁for ▁a ▁pair ▁of ▁il ia ▁and ▁their ▁sac rum . ▁In ▁ 2 0 1 2 ▁Mike ▁P . ▁Taylor ▁and ▁Matt ▁J . ▁Wed el ▁published ▁a ▁short ▁abstract ▁describing ▁the ▁material ▁of ▁A . ▁minim us , ▁finding ▁it ▁hard ▁to ▁place ▁among ▁either ▁Di pl od oco idea ▁or ▁Mac ron aria . ▁While ▁it ▁was ▁placed ▁with ▁Salt as aur us ▁in ▁a ▁ph