642 JOURNAL OF PALEONTOLOGY, V. 63, NO. 5, 1989

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• Phanerozoic
• Eurypterid
• Slimonia
• Megalograptus
• Stylonuroidea
• Eurypterus
• Dolichopterus
• Pterygotus
• Stylonurina
• Eurypterida
• Geologic time scale
• Paleozoic