Can someone identify this worm?
The &quot;bump&quot; on an earthworm (i.e., a worm species of the order Opisthopora) is a clitellum. Clitella are only visible on earthworms when they're sexually mature [Sources: 1, 2, 3]. So the absence of a clitellum does not preclude your specimen from being a member of this order.
The species in your photo is almost undoubtedly some species of earthworm. Without clearer images or more detail, I can't imagine someone taking the time to try to ID to species.
There are many species of earthworms present in Pennsylvania (though likely none of them are native to the US: see here). Keep an eye out for a recent invader, the &quot;Asian Jumping Worm&quot; [read more].