▁strong ▁j aws ▁that ▁could ▁open ▁wider ▁than ▁those ▁of ▁the ▁early ▁re pt iles . ▁While ▁its ▁sharp ▁teeth ▁were ▁all ▁of ▁the ▁same ▁shape , ▁it ▁did ▁possess ▁a ▁pair ▁of ▁en larg ed ▁can ines , ▁suggesting ▁that ▁it ▁was ▁a ▁car n iv ore . ▁ ▁Arch ae othy ris ' ▁legs ▁were ▁art ic ulated ▁later ally ▁at ▁its ▁pel vis ▁and ▁shoulders , ▁which ▁gave ▁it ▁a ▁spraw ling ▁st ance . ▁ ▁Classification ▁Arch ae othy ris ▁belonged ▁to ▁the ▁family ▁O ph iac od ont idae , ▁a ▁group ▁of ▁early ▁p ely c osa urs ▁that ▁evol ved ▁early ▁in ▁the ▁Late ▁Car bon ifer ous . ▁It ▁was ▁one ▁of ▁the ▁earliest ▁and ▁most ▁bas al ▁syn aps ids ▁( the ▁group ▁which ▁include ▁m amm als ). ▁ ▁Below ▁is ▁a ▁cl ad ogram ▁modified ▁from ▁the ▁analysis ▁of ▁B enson ▁( 2 0 1 2 ): ▁ ▁Disc overy ▁and ▁pale o ec ology ▁F oss ils ▁of ▁Arch ae othy ris ▁were ▁first ▁described ▁in ▁ 1 9 7 2 ▁from ▁the ▁J og g ins ▁foss il ▁cl iffs , ▁the ▁same ▁local ity ▁in ▁which ▁the ▁early ▁re pt iles ▁H yl onom us ▁and ▁Pet ro lac osa urus ▁( both ▁of ▁which ▁res emble ▁Arch ae othy ris ) ▁were ▁found . ▁ ▁Arch ae othy ris ▁lived ▁in ▁what ▁is ▁now ▁Nova ▁Scot ia , ▁about ▁ 3 0 6 ▁million ▁years ▁ago ▁in ▁the