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Fig. 4 | BMC Evolutionary Biology

Fig. 4

From: The oldest described eurypterid: a giant Middle Ordovician (Darriwilian) megalograptid from the Winneshiek Lagerstätte of Iowa

Fig. 4

Pentecopterus decorahensis, cuticular structures on prosomal ventral plate. a SUI 140009, lateral portion of prosomal ventral plate showing row of scales (arrowed) along the inner margin. b SUI 140009, prosomal ventral plate with terrace lines and ventral prosomal integument bearing setae. c SUI 140011, setae covering ventral prosomal integument. Each figure is oriented with the specimen anterior to the left. Scale bars = 1 mm

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