Ordovician Life, Including: Ostracoderm, Arandaspida, Thelodonti, Pteraspidomorphi, Eriptychiida, Arandaspis, Astraspis, Astraspida, Sacabambaspis, Areyongalepis, Stroinolepis, Apedolepis, Asaphida, Corynexochida, Lichida, Dalmanites, Cheiruridae ...