A newfound spider species wears a striking red-and-white pattern on its back that resembles the grin worn by Batman's long-standing nemesis, the Joker. The resemblance is so uncanny that the researchers who described the arachnid named the species after actor Joaquin Phoenix, who portrayed the tormented, smiling villain in the 2019 film, "Joker."

Ironically, the colorful spider belongs to a genus that was named for the late punk rock icon Lou Reed, who famously wore black and rarely smiled.

Scientists discovered Loureedia phoenixi in Iran; it's the first Loureedia spider to be identified outside the Mediterranean region, they reported in a new study. The genus, first described in 2018, now includes four species.

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On the backs of the male L. phoenixi spiders, a splash of vivid red stands out against a background of white, much like the Joker's unnerving smile contrasts with his white facial makeup, the scientists wrote in the study. Though, you'd need magnification to see it clearly, as the spider's body measures only about 0.3 inches (8 millimeters) long and is covered in tiny hairs.

In fact, spiders in this family — Eresidae — are known as velvet spiders because they sport dense, velvety coats, said lead study author Alireza Zamani, an arachnologist and doctoral candidate in the Biodiversity Unit at the University of Turku in Finland. Velvet spiders are especially interesting to arachnologists because some have unusual habits, such as cooperating to build communal nests and collectively caring for their young, Zamani told Live Science in an email.

Discovering Loureedia spiders is challenging, because the arachnids are active aboveground only for a three-week period each year.

"These spiders spend most of their lives in their subterranean nests," Zamani said. Males leave their burrows to hunt for females, "usually from late October to mid-November," and spiderlings come to the surface when they leave their mother's nest, he explained.

This is the fourth species to be described in the genus Loureedia, which was named for the musician Lou Reed. (Image credit: Niloofar Sheikh)So far, scientists have collected and described only male Joker spiders. But the search will continue for the elusive females, targeting locations where males have been found.

"Ideally, if you have enough time and patience, it would be interesting to track

a wandering male. He should know how to find the female better than anyone else," Zamani said. "This way, you would also have the chance of observing and photographing the actual mating behavior, which has not been documented for any Loureedia species yet," he added.

The findings were published in the June issue of the journal Arthropoda Selecta.

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