z uma ensis ▁W otte ▁et ▁Sund berg , ▁ 2 0 1 7 , ▁Lower ▁Camb rian , ▁Monte z uman ▁Stage , ▁the ▁United ▁States . ▁M . ▁r hom bo id ale ▁Beng t son , ▁Matt he ws ▁et ▁Miss arz he v sky , ▁ 1 9 8 6 , ▁Lower ▁Camb rian , ▁upper ▁parts ▁of ▁the ▁A td aban ian ▁Stage , ▁Kaz akh stan ; ▁A td aban ian ▁Stage , ▁Canada , ▁the ▁United ▁States ▁( M . ▁c f . ▁r hom bo id ale ). ▁M . ▁rob ison i ▁Beng t son , ▁Matt he ws ▁et ▁Miss arz he v sky , ▁ 1 9 8 6 , ▁Middle ▁Camb rian , ▁Am gan ▁Stage , ▁the ▁United ▁States ; ▁M . ▁roz an ovi ▁Dem iden ko , ▁ 2 0 0 6 , ▁Lower ▁Camb rian , ▁Toy onian ▁Stage , ▁Si ber ian ▁Platform . ▁M . ▁sin icum ▁Chen , ▁Hou ▁et ▁Lu , ▁ 1 9 8 9 , ▁Lower ▁Camb rian , ▁upper ▁Me ish uc un ian ▁Stage ▁(= ▁A td aban ian ▁Stage ) ▁Stage , ▁China ▁( Y unn an . ▁M . ▁s pha ero ides ▁Hin z , ▁ 1 9 8 7 , ▁Lower ▁Camb rian , ▁A td aban ian ▁Stage , ▁Great ▁Britain . ▁M . ▁ten u ip or atum ▁Beng t son , ▁Matt he ws ▁et ▁Miss arz he v sky , ▁