Ptychopariida
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Ptychopariida is a large, heterogeneous order of trilobite containing some of the most primitive species known. The earliest species occurred in the second half of the Lower Cambrian, and the last species did not survive the Ordovician–Silurian extinction event.
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- ElrathiakingiUtahWheelerCambrian.jpg
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Ptychopariida is a large, heterogeneous order of trilobite containing some of the most primitive species known. The earliest species occurred in the second half of the Lower Cambrian, and the last species did not survive the Ordovician–Silurian extinction event.
right|thumb|Asaphiscus|Asaphiscus wheeleri, a Cambrian trilobite of the Superfamily Ptychoparioidea
Excerpted from Wikipedia’s “Ptychopariida” article, available under the CC BY-SA 4.0 licence.