Fig. 19From: The oldest described eurypterid: a giant Middle Ordovician (Darriwilian) megalograptid from the Winneshiek Lagerstätte of Iowa Pentecopterus decorahensis telson. a SUI 139956, almost complete, position of scales shown in Fig. 19c arrowed. b SUI 139957, showing partial exfoliation. c SUI 139956, detail of cuticular ornamentation. Scale bars for a–b = 10 mm, c = 2 mmBack to article page