It may be the worst thing to hit the Jersey Shore since Snooki.

As if sharks aren’t enough to worry about, “insidious” clinging jellyfish from the Pacific Ocean have been spotted in New Jersey waters — and they pack a powerful sting.

“Just a heads up folks. I picked up a couple of clinging jellyfish in the northern part of Barnegat Bay this weekend,” warned Paul Bologna, a Montclair State University marine biologist, posted online May 21. “So if you are in the shallow grass beds be wary of these little nasty stingers.”

Native to the Pacific Ocean, the invasive clinging jellies, whose scientific name is Gonionemus vertens, have also been found in Cape May, NJ.

Bologna, who monitors the jellies and post updates on the New Jersey Jellyspotters Facebook page, said the invertebrates live in the back bay areas — and are no day at the beach.

“These little guys, these clingers, live in grass beds and algae. So they’re in shallow water. So if you’re out there throwing the football in the shallow water, you may run into ’em. And because they’re so small, you might not even see them or notice them,” Bologna told The Post.

“They’re kind of insidious because when you get stung, it’s not bad immediately, but four or five hours later the extreme pain starts to kick in.”

Bologna likened the pain to “getting a charley horse . . . bad muscle spasms. Imagine your whole body doing that.”

The tiny critters usually populate NJ in mid-May, according to the state Department of Environmental Protection.

They are only the size of a quarter, but their sting can send someone to the hospital.

They were discovered in New Jersey in 2016.

This year they’re “the furthest south that we’ve ever seen them,” Bologna told NJ.com.

The body of the adult is “mostly transparent” in appearance with a single distinctive reddish-orange to yellow cross.

They have 60 to 80 alternating short and long tentacles that contain the stinging cells.