Dogs and cats that go out onto the streets may be carrying an invasive species without their owners realizing it. It is a flat worm, capable of adhering to hair with extremely sticky mucus and traveling long distances, contributing to its spread across several European countries.
The hypothesis gains strength in a study cited by the Daily Mail, a general British newspaper, which reports the identification of these organisms by researchers from the French National Museum of Natural History. According to the same source, the specimens were found clinging to the fur of domestic animals, with tufts of hair still visible.
The worms can reach around 20 centimeters in length and are distinguished by a yellow stripe along their back, accompanied by brown lines.
The species, known scientifically as Caenoplana variegata, originates from Australia and feeds on arthropods, which raises concerns about the impact on soil ecosystems.
Silent dispersion
Until now, the spread of these flatworms has been mainly associated with plant trade and transport. Data collected over more than a decade in citizen science initiatives in France point to a new vector of dispersal. Companion animals, when moving between gardens, parks and humid areas, can unintentionally carry the worms.
The ability to adhere to surfaces through persistent mucus facilitates attachment to the hair. Reproduction without the need for a partner and resistance in different environments increase the probability of survival during transport.
Despite its size and unusual appearance, there is no indication of direct danger to dogs and cats. The risk identified by the researchers has to do with the local fauna. By preying on insects and other small invertebrates, these organisms can alter soil balance and affect food chains.
Scientists estimate that, together, dogs and cats travel billions of kilometers annually. Even if only a small fraction carry these worms, the accumulated distance is enough to favor the expansion of the species.
Surveillance without alarmism
The recommendation involves a simple check of the animals’ fur after walks, especially in humid environments or with dense vegetation. Early detection can prevent accidental introduction of these organisms into new locations.
The phenomenon fits into a broader context of the circulation of non-native species, facilitated by human mobility and environmental changes. The presence of an additional dispersal vector, such as domestic animals, adds a variable that is difficult to control.
Furthermore, he highlights that the study was published in the scientific journal PeerJ and that similar situations may be occurring in other European countries, although the data is concentrated in French territory.
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