“Spiderman” Worm-Snails Discovered on Florida Shipwreck

“These worm-snails are particularly weird animals,” says Dr. Rüdiger Bieler, curator of invertebrates and the lead author of a paper in the journal PeerJ describing the new snails. “And while we find lots of unusual snails, this one could have a substantial impact on coral reef restoration efforts.”

Instead of having coiled shells like most snails, worm-snails have irregularly-shaped tubular shells that they cement onto a hard surface. And while most snails are slow movers, adult worm-snails don’t move at all—instead, they stick to one spot for the rest of their lives. That makes them good candidates to live on hard surfaces like ships and coral reefs.

The new species, Thylacodes vandyensis, is named for the “Vandy,” the nickname the scuba diving community has given to the USNS General Hoyt S. Vandenberg, a retired naval vessel intentionally sunk to serve as an artificial reef in the lower Florida Keys. This ship is the only place the new worm-snails have ever been found, glued to the vessel’s hull.

“I first got interested in these guys when I saw their giant slime glands,” says Bieler. “Normally, snails produce a trail of slime so that they can glide on it in order to move. But worm-snails are stationary; what did they need slime glands for?”

It turns out, these snails don’t use their slime to move—they use it to hunt.

While the worm-snails are immobile, Bieler and his co-authors from The Field Museum, Florida International University, and Cape Breton University have reason to believe that the specimens they found in Florida are a long way from home. All signs point to these snails being an invasive species from the Indo-Pacific, where they had not yet been recognized.

“We know the Atlantic worm-snail fauna very well, so the likelihood of finding a new species native to the Florida Keys is pretty small,” says Bieler. “These snails might have stowed away in bilge water or the hulls on cargo ships, and once they arrived here, they were the perfect colonizers.”

“The living coral reefs in the Florida Keys are already full of animals,” explains Bieler, “but the deliberately scuttled shipwrecks are empty, brand-new real estate. There were fewer organisms to compete with for space on the artificial reef, and fewer resident predators that could harm them.”

But it’s not necessarily a good thing that the worm-snails have taken so well to the shipwreck. “Worm-snails can be harmful to corals and other reef organisms,” says Bieler. “They can reduce coral growth and have been shown to serve as hosts for certain blood flukes, which are parasites of loggerhead turtles.”

Discovering the newly arrived snail and clam species, says Bieler, is an important step to monitoring coral reef health. “The artificial reefs could serve as the canary in the coal mine,” says Bieler. “If we monitor their presence on the shipwrecks, we can keep tabs on them and potentially stop them from spreading to the living reefs.” 

Despite the havoc that the worm-snails could potentially wreak, Bieler is glad to have found them. “The discovery of Thylacodes vandyensis helps highlight why museum collections are important. Without comparing countless snail specimens at The Field Museum and around the world, we wouldn’t have been able to identify these snails as a new species, and we wouldn’t be able to make the kinds of progress in monitoring and reef restoration that we’re now equipped to,” says Bieler. “Plus, they’re awfully interesting.”