Almost certainly yes, although I can't think of
any examples off-hand. I would expect that some
trilobites may have also eaten smaller sea
scorpions, or larger ones that had already died.
Unfortunately, catching animals in the act like
that is really quite difficult in the fossil
record. We can get fossilized excrement that
contains trilobite fragments, so we know something
was eating them, but we don't know what animal the
fossil feces came from. As for a sea scorpion with
a trilobite in its claw or something like that,
the sea scorpion would have to have been buried
alive in an undersea mudslide or a fall of
volcanic ash or something like that while it was
working on the trilobite - and under those
circumstances, it would probably let go and try to
save itself from being buried and killed than be
worried about eating the trilobite.
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