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Fig. 9 | BMC Evolutionary Biology

Fig. 9

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

Fig. 9

Pentecopterus decorahensis, prosomal appendage III. a SUI 102857, complete appendage lacking armature. b SUI 139953, podomeres 2–8 showing enlargement of fixed lateral spines on more distal podomeres. c SUI 139951, podomeres 1–5. d SUI 139948, complete appendage, podomeres 1–5 preserved as imprints. e SUI 139973, sixth podomere showing moveable and fixed spines. f SUI 139990, podomeres 7–8 in ventral view. g SUI 140013, podomeres 6–8 in ventral view. h SUI 140007, podomeres 6–8 in lateral view. i SUI 139925, gnathobase of coxa. j SUI 139952, podomeres 1–5. k SUI 139922, large podomere 6 displaying fixed spine. l SUI 139944, podomeres 7–8 with enlarged fixed spine of podomere 6. m SUI 139929, podomeres 7–8 with proximal region of fixed spine of podomere 6. n, o SUI 139930, podomeres 2–6. n Part, o Counterpart. III-1–III-8 = podomeres 1–8, GB = gnathobase, FS = fixed spine, MS = moveable spine, PR = podomere rotation. Scale bars = 10 mm

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