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Fig. 8 | BMC Evolutionary Biology

Fig. 8

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

Fig. 8

Pentecopterus decorahensis, prosomal appendage II. a SUI 139919, fragmentary appendage showing moveable spines. b SUI 140018, enlarged fixed spine with serration. c SUI 139975, coxa with moveable endite and podomeres 2–3. d SUI 139969, small coxa with moveable endite. e, f SUI 139920, podomeres 3–7 showing moveable and fixed spines. All spines are in situ except for the large fixed spine originating from the fourth podomere, which is detached and angled anteriorly to the appendage. e Part, (f) Counterpart. II-1–II-7 = coxa and appendage podomeres 1–7, EN = endite, FS = fixed spines, MS = moveable spines. Scale bars for ac, ef = 10 mm, for d = 1 mm

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