Texas is home to some of the creepiest, crawliest, and otherwise oddest animals on the planet. We introduce you to them in What in Tarnation?!, an occasional series. If most of us were to stumble upon six inches of spiked, segmented worm flesh during a leisurely walk along the beach, we’d react, at best, with “eww.” But when Jace Tunnell was beachcombing just north of Mustang Island State Park, in mid-August, and found a marine polychaete—also known as a bristle worm or fireworm—on a barnacle-covered log that had washed ashore, he was as excited to see that bad boy as that bad boy had once been excited to see the barnacles on that log. (Fireworms feed on barnacles.)Tunnell serves as the director of community engagement…