"Protopliomerella"@en . "Protopliomerella is an extinct genus from a well known class of fossil marine arthropods, the trilobites. It lived during the early part of the Arenig stage of the Ordovician Period, a faunal stage which lasted from approximately 478 to 471 million years ago."@en . . "Early Arenig"@en . "Protopliomerella"@en . "Arthropoda"@en . "Protopliomerella is an extinct genus from a well known class of fossil marine arthropods, the trilobites. It lived during the early part of the Arenig stage of the Ordovician Period, a faunal stage which lasted from approximately 478 to 471 million years ago."@en . "Animalia"@en . . . "fossil"@en . . . "Protopliomerella"@en .