Researchers Uncover the Secrets of the Spider-Tailed Viper

Observed in the mountains of Iran, the spider-tailed viper stands out, as its name suggests, for its peculiar arachnid lure that it shakes to attract prey. Researchers have recently examined its internal structure.

Tail Lure

If the first specimen of the spider-tailed viper was collected in 1968, its unusual anatomical feature long puzzled researchers. Initially, scientists speculated that the tail’s tip was a real camel spider that it had previously captured, a deformity, or even a tumor.

It wasn’t until the early 2000s, with the examination of a second snake bearing the same elaborate tail ornamentation, that the hypothesis of a lure used to capture prey gained traction and that the species could be confirmed.

It wasn’t until 2008 that Pseudocerastes urarachnoides was observed using this bulbous and scaly structure in its natural habitat. In the footage below, you can see it waving it with striking realism to imitate the movements of a spider, drawing the eye of an unlucky bird that was struck in mid-flight by the reptile.

No Surprise

In a study published in the journal The Anatomical Record, Sara Ruane of the Field Museum in Chicago and her colleagues used X-ray imaging to examine for the first time the internal structure of this part of the Iranian viper’s anatomy. Despite its distinctive external appearance, characterized by highly specialized scales, it turned out to be remarkably similar to that of its close relatives, with nearly the same arrangement of vertebrae and soft tissues.

“We did not necessarily expect to find new bones, but we did not imagine it would be so conventional,” the team notes. “The viper’s tail is a prime example of evolutionary innovation, with an ancestral structure largely repurposed to perform a completely different function.”

More broadly, these findings have implications for how we view long-extinct creatures and for our understanding of their lifestyle, with unique morphological traits that may not be reflected in the internal skeleton alone.

Earlier, researchers had already unraveled the mystery of the false viper.