▁cro c ody l omorph , ▁but ▁established ▁it ▁was ▁different ▁from ▁Salt op os uch us . ▁ ▁Oliver ▁R au h ut ▁and ▁Ax el ▁Hung er bu h ler ▁( 2 0 0 0 ) ▁noted ▁features ▁of ▁the ▁verte bra e ▁which ▁suggest ▁that ▁Pro com ps ogn ath us ▁may ▁be ▁a ▁co el oph ys id ▁or ▁cer at osa ur , ▁and ▁Car rano ▁et ▁al . ▁( 2 0 0 5 ), ▁in ▁their ▁re - stud y ▁of ▁the ▁related ▁genus ▁Seg is aur us , ▁found ▁both ▁Seg is aur us ▁and ▁Pro com ps ogn ath us ▁to ▁belong ▁to ▁the ▁Co el oph ys idae ▁within ▁Din osa uria . ▁In ▁ 2 0 0 4 ▁David ▁Allen ▁considered ▁Pro com ps ogn ath us ▁to ▁be ▁a ▁primitive , ▁non - din osa ur ian ▁orn ith od ir an . ▁ ▁Pale o ec ology ▁Pro com ps ogn ath us ▁lived ▁in ▁a ▁relatively ▁dry , ▁in land ▁environment ▁and ▁may ▁have ▁e aten ▁insect s , ▁l iz ards ▁and ▁other ▁small ▁pre y . ▁Contempor aries ▁of ▁Prom ps ogn ath us ▁included ▁the ▁co el oph y so ids ▁H alt ic osa urus ▁and ▁Dol ich os uch us , ▁as ▁well ▁as ▁the ▁Sau rop od omorph s ▁Pl ate osa urus ▁g rac ilis ▁and ▁E fra asia ▁minor . ▁ ▁We ish amp el , ▁et ▁al . ▁( 2 0