The fossilized remains of these primarily Paleozoic fossils sometimes show the molting process quite distinctly:
Rather than finding the whole fossil with its namesake distinct three parts
sometimes only the trilobite bottoms are found:
When first searching the web for trilobite bottoms here's the image that popped up first:
Trilobite bottoms came up as a topic for this week's PEOTS as I was planting artichoke plants (nasty, spiky, weedy looking things):
It was a small leap from artichoke bottoms (which are, of course, also known as hearts)
to trilobite bottoms. . . .
Looking forward to Tri lo bite of the artichoke bottoms soon!
And for those science grads: