15 Basal euarthropod development: a fossil-based perspective N I G E L C . H U G H E S , J O A C H I M T. H A U G A N D D I E T E R W A L O S Z E K The morphological gap between Euarthropoda (the crown group

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• Trilobite
• Agnostida
• Pygidium
• Cephalon
• Tagma
• Redlichiida
• Dikelocephalus
• Psychopyge