Ptychopariida

Asaphiscus wheeleri, a Cambrian trilobite of the Superfamily Ptychoparioidea

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.

单词	Ptychopariid
释义	Ptychopariid 英语百科 Ptychopariida 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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