Clone ‘warrior worms’ found in snails

UC SANTA BARBARA (US) — Scientists have discovered a caste of genetically identical “warrior worms”—members of a parasitic fluke species that invade the California horn snail.

The soldier clones fiercely fend off other invading parasites, using their relatively large mouths as a weapon. Findings are reported this week in the Proceedings of the Royal Society B.

“We have discovered flatworms in colonies with vicious, killer morphs defending the colony,” says Armand Kuris, professor of zoology at the University of California, Santa Barbara. “These flukes have a strongly developed social organization, much like some insects, mammals, and birds.”

These worms form colonies in snails. Reproductive worms and soldier worms cooperate to grow and defend their colony within the snail. These two types of individuals look and behave differently.

Kuris calls the worms parasitic “body snatchers,” because they castrate the snail, making it unable to reproduce. The snail, which is only an inch and a half long, houses thousands of worms. A mature colony of this type of worm weighs 25 percent of the weight of the host snail.

The worms are produced through asexual reproduction and their relationships are even more dramatic than those among honeybees. For example, worker bees and queen bees are related as sisters through sexual reproduction.

“The fluke castes described by our research team are genetically identical,” says first author Ryan Hechinger, assistant research biologist. “They are clones.”

Many other species of flukes probably have colonies of clones with castes, says Kuris. He expects international research to expand in this direction, now that this example has been discovered.

These colonies also act like an immune system, defending the body of the snail from other fluke infections, says second author Alan Wood, a marine science lab manager. The soldiers behave like white blood cells; they attack other unrelated flukes, biting and killing them.

These flukes with soldier castes may also have a biomedical application. They might be used in the biological control of major human parasitic diseases such as blood flukes. There are 200 million cases of blood fluke diseases worldwide, says Kuris.

The soldier worms might eliminate infections from forming in the snail hosts, preventing infections in humans. Liver flukes might also be controlled.

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