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| protaspides (the minute discoids or oval first larval forms of a trilobite that have a well-marked axial lobe, large head region, and but little segmentation) | |||
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| protaspis (pl. protaspides; the minute discoid or oval first larval form of a trilobite that has a well-marked axial lobe, large head region, and but little segmentation) | |||
| protaspid period | |||