Life-restoration of anomalocaris
It is certain that anomalocaris fed on soft-bodied animals like worms and pikaia (a free-swimming creature thought to be the ancestor of all vertebrates), but there is some debate as to whether it also ate hard-shelled creatures like trilobites. Giant fossilized turds containing broken bits of trilobite exoskeleton seem to indicate that anomalocaris (or some predator almost as large) was eating trilobites, but some paleontologists have questioned whether anomalocaris' mouth parts were strong enough to crush such shells. It may have subsisted on worms that it sucked out of the sea floor. In any case, the anomalocarises statted up below are assumed to have strong mouth parts capable of gnawing on stalwart adventurers.
anomalocaris painting by Ratianidze, via WikimediaAnomalocaris, looking decidedly Lovecraftian