Erratus 
... that Erratus was one of the earliest-known arthropods to show the origins of lungs and limbs?
... that <i id="mwAY0"><b id="mwAY4"><a href="./Erratus" id="mwAY8" rel="mw:WikiLink" title="Erratus">Erratus</a> </b></i> was one of the earliest-known <a href="./Arthropod" id="mwAZA" rel="mw:WikiLink" title="Arthropod">arthropods</a> to show the origins of lungs and limbs?