Best Cheirurida
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1
A Devonian cheirurid trilobite from Morocco, distinguished by segmented genal spines resembling a rattlesnake's rattle, earning it the popular name 'rattlesnake trilobite.'
2
An Ordovician cheirurid trilobite named for its cross-shaped glabella, recorded from Baltoscandia and the British Isles across multiple Ordovician stages.
3
An Ordovician cheirurid trilobite widespread across Baltoscandia, characterized by elongated genal spines and heavily ornamented pleural lobes in its spiny exoskeleton.
4
Ordovician cheirurid trilobite from Laurentia, known from North American deposits and characterized by its distinctly spinose pygidial margin.
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