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Fig. 25 | BMC Evolutionary Biology

Fig. 25

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

Fig. 25

Ontogenetic changes in prosomal appendages of Pentecopterus decorahensis from juvenile to adult (coxa not shown). a Juvenile appendages II–V. b Adult appendage II. c Adult appendage III. d Adult appendage IV. e Adult appendage V. Homologous structures are color coded: red = distal denticulations, green = moveable ventral spines, blue = fixed lateral spines

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