The asaphid trilobite was a broad-bodied, smooth-shelled kind of trilobite common in Ordovician seas. It had a wide oval shape, large head shield, segmented middle, and rounded tail. That would place it roughly around 470 to 445 million years ago, when shallow seas were full of armored arthropods like this one.

Trilobites lived in our ancient oceans for nearly 300 million years, from the Early Cambrian Period about 521 million years ago, to the end of the Permian Period. To the Great Dying that killed off most life about 252 million years ago.

Trilobites do not have any direct living descendant species. They completely vanished during the Permian mass extinction approximately 252 million years ago, making them an evolutionary dead end.