▁for ▁increased ▁force ▁to ▁be ▁generated ▁by ▁that ▁digit , ▁which , ▁combined ▁with ▁a ▁shorter ▁and ▁wider ▁met at ars us , ▁and ▁a ▁notice able ▁marked ▁h inge ‐ like ▁morph ology ▁of ▁the ▁art icular ▁surfaces ▁of ▁met at ars als ▁and ▁ph al anges , ▁possibly ▁allowed ▁e ud rom ae osa urs ▁to ▁ex ert ▁a ▁greater ▁g ri pping ▁strength ▁than ▁un en lag i ines , ▁allowing ▁for ▁more ▁efficient ▁sub du ing ▁and ▁killing ▁of ▁large ▁pre y . ▁In ▁comparison , ▁the ▁un en lag i ine ▁d rom ae osa ur ids ▁possess ▁a ▁longer ▁and ▁sl ender ▁sub arct omet at ars us , ▁and ▁less ▁well ‐ mark ed ▁h inge ▁joint s , ▁a ▁trait ▁that ▁possibly ▁gave ▁them ▁greater ▁cursor ial ▁capac ities ▁and ▁allowed ▁for ▁greater ▁speed ▁than ▁e ud rom ae osa urs . ▁Additionally , ▁the ▁longer ▁second ▁ph al an x ▁of ▁the ▁second ▁digit ▁allowed ▁un en lag i ines ▁fast ▁movements ▁of ▁their ▁feet ' s ▁second ▁digits ▁to ▁h unt ▁smaller , ▁faster ▁types ▁of ▁pre y . ▁These ▁differences ▁in ▁locomot or ▁and ▁pre dat ory ▁special izations ▁may ▁have ▁been ▁a ▁key ▁feature ▁that ▁influenced ▁the ▁evolution ary ▁paths ▁that ▁sh aped ▁both ▁groups ▁of ▁d rom ae osa urs ▁in ▁the ▁northern ▁and ▁southern ▁hem is pher es , ▁respectively . ▁ ▁Classification ▁ ▁During ▁the ▁description ▁of ▁H als z kar apt or ▁in ▁ 2 0 1