The strange grin of the Happy-Face spider has been spotted far from the Hawaiian Islands, its only previously known home, much to scientists’ surprise.
In a recent paper published in Evolutionary Systematics, researchers from the Forest Research Institute and the Regional Museum of Natural History have found a spider bearing the unmistakable grin in Uttarakhand, India’s Montane mountains.
The researchers call it the Himalayan Happy-Face spider, Theridion himalayan, named for the unexpected combination of its highly recognizable markings and strange new location.
Finding the Happy-Face Spider
As with many scientific discoveries, the Himalayan Happy-Face Spider was discovered entirely by accident; the researchers, Ashirwad Tripathy and Devi Priyadarshini, were initially focused on the region’s ants.
“So, one fine day, when he shared this image from the underside of a Daphniphyllum leaf, I froze in shock because I had seen the Hawaiian spider during my master’s program itself, and I knew instantly we had a jackpot because of its striking resemblance,” said Priyadarshini, a researcher with the Regional Museum of Natural History in Bhubaneswar, and the co-author of a new study deatiling the discovery.
“I asked him to send all morphs that he found, and that led to the discovery in the next few months, from October 2023 onwards.”
According to Priyadarshini, she has always been interested in high-altitude spiders because the significant differences in landscape and vegetation in these regions compared with low-altitude plains offer “a gateway to look at other polymorphic species from this region.”
Himalayan Spider Species
According to Tripathy, this discovery may only be the beginning for the documentation of Himalayan Happy-Face spiders, as more variations may be identified in future surveys.
“The name Himalayana was decided as the species name because we both wanted to pay our respects to the mighty Himalaya mountain ranges, which have been standing tall not just guarding our country but also holding a plethora of biodiversity within them, said co-author Ashirwad Tripathy, of the Forest Research Institute in Dehradun. “Since this spider was the first polymorphic from this region, we decided to make it an ode to the amazing mountain ranges.”
So far, the species has been found in three locations around Uttarakhand, including Makku, Tala, and Mandal, yielding 32 distinct color variations. In their investigation, the researchers conducted a DNA analysis of the new species, discovering that it differed by approximately 8.5% from the previously known Hawaiian Happy-Face spider. This indicates that the Himalayan version evolved independently.
Mysterious Markings
While the markings are fascinating, perhaps partially due to a certain amount of pareidolia in humans, the researchers are uncertain exactly why the spiders evolved to feature them. Notably, other creatures in the region bear similar colorful body markings.
“The reason behind the expression of polymorphism is also very complex and unique,” Priyadarshini explained. “These patterns definitely help them survive better in the wild, which is understood prima facie, but why do they resort to such patterns on their back, and what functional role in their life cycle does it exactly serve is yet to be deciphered. This is definitely indicative of a deeper genetic mystery.”
One strange connection between the Hawaiian and Himalayan varieties was their shared propensity to cling to ginger plants. This is especially notable because ginger is not native to Hawaii, suggesting an evolutionary connection between the species.
“How did the spiders choose an invasive species and ginger exactly?” Priyadarshini asks, noting this adds an unusual layer to the mystery, especially “if T. himalayana is an elder cousin of T. grallator, although discovered 125 years later!”
“Although this sounds like a tall claim now, it will be our further scope of work to establish any missing links,” Priyadarshini adds.
The paper, “On the Discovery of a New Polymorphic Happy-Face Spider (Araneae, Theridiidae) from the Western Himalayas, India, with Notes on its Natural History,” appeared in Evolutionary Systematics on April 24, 2026.
Ryan Whalen covers science and technology for The Debrief. He holds an MA in History and a Master of Library and Information Science with a certificate in Data Science. He can be contacted at ryan@thedebrief.org, and follow him on Twitter @mdntwvlf.