ARACHNOLOGY

New “happy-face” spider species discovered in the Indian Himalayas

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Theridion himalayana sp. nov.

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Credit: Devi Priyadarshini and Ashirwad Tripathy

Vibrant, tiny, and sporting a bright red grin on its back, the Happy-Face spider is one of the most famous and recognisable arachnids in the world. For over a century, this cheerful-looking creature was thought to be a unique resident of the Hawaiian Islands, a biological curiosity found nowhere else on Earth. 

When researchers from the Forest Research Institute and the Regional Museum of Natural History discovered a new species of spider with the same unmistakable smile in the montane mountains of Uttarakhand, India, they knew exactly what to call it: Theridion himalayana, the Himalayan Happy-Face Spider. 

“The discovery was accidental because our survey was [originally] on ants”, said Devi Priyadarshini, a scientist at the Regional Museum of Natural History who co-authored the study. “But my co-author [Ashirwad Tripathy] kept sending me spiders from high altitude regions for identification. 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 programme itself, and I knew instantly we had a jackpot because of its striking resemblance. 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.”

Priyadarshini added that she was always interested in exploring high-altitude spiders because the landscape and vegetation are so different there than in the plains. “This almost came across as a gateway to look at other polymorphic species from this region.” Ashirwad also said that we could find more variations in the species if the surveys could be done extensively.

The species name, himalayana, serves as a tribute to the mountain range where the spider was found at elevations of over 2,000 meters above sea level. “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”, Ashirwad said. “Since this spider was the first polymorphic from this region, we decided to make it an ode to the amazing mountain ranges.”

The research, published in the open-access journal Evolutionary Systematics, identified 32 different colour variations, or “morphs”, of the species collected from three locations in Uttarakhand: Makku, Tala, and Mandal. DNA analysis revealed a genetic variation of approximately 8.5% from the Hawaiian happy-face spider, confirming it as a separate lineage that evolved independently in Asia. 

While the smiling patterns are striking, their exact purpose remains a mystery. “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.” Ashirwad also mentioned that the spider species was surrounded by critters which had similar colour patterns on their body.

The study also noted that these spiders are frequently found on ginger plants (Hedychium species), mirroring the behaviour of their Hawaiian cousins. Since ginger is not native to Hawaii, the researchers are intrigued by the evolutionary connection. “How did the spiders choose an invasive species and ginger exactly?” Priyadarshini noted. “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, if at all, through Hedychium sps.”

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Journal

Evolutionary Systematics

DOI

10.3897/evolsyst.10.174338 

Subject of Research

Animals

Article Title

On the discovery of a new polymorphic Happy-Face Spider (Araneae, Theridiidae) from the Western Himalayas, India, with notes on its natural history

Mature male (left) and female (right) of Theridion himalayana sp. nov. (IMAGE)

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Mature male (left) and female (right) of Theridion himalayana sp. nov.

Different "morphs" of Theridion himalayana sp. nov.

 

Collage showing morphs of some of the males and females of Theridion himalayana in the population with different polymorphic patterns on abdomen.

 

Cephalothorax of female holotype of T. himalayana sp. nov.

Map showing the Theridion spp. from India with the locality record of the newly described Theridion himalayana sp. nov.

 

Theridion himalayana sp. nov. 

Credit

Devi Priyadarshini and Ashirwad Tripathy

 

Molecular net boosts the power of natural biopesticides

Vlaams Instituut voor Biotechnologie

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Brussels, 19 May 2026 – Scientists at VIB and Vrije Universiteit Brussel have uncovered a previously unknown mechanism that helps a widely used biological pesticide become more effective. The study, published in Nature Communications, reveals how bacteria produce ultra-strong protein fibers that form a molecular net, trapping infectious spores and toxins into a sticky film that enhances their ability to kill insect pests.

A new piece of the biopesticide puzzle

Bacillus thuringiensis (Bt) is a bacterium widely used in eco-friendly pest control. It works by attacking insect larvae in two stages. First, it releases toxins that damage the insect's digestive system, creating an opening for spores to enter. The spores then germinate and multiply, consuming the insect from the inside. When the food source is depleted, the bacterium produces new spores and toxins that are released into the environment, ready to infect another insect. Because Bt targets only certain insects, it's considered safe for humans, other wildlife, and helpful insects like bees.

In this way, spores and toxin crystals form an intricate pair in the life cycle of the bacterium. However, one long-standing question has puzzled researchers: how do these spores and toxins stay together in the environment long enough to infect insects effectively?

Researchers at the VIB-VUB Center for Structural Biology have now identified the answer: a previously unknown fibrous network they call ‘sporesilk’, a natural nanofiber net with remarkable properties.

Using advanced imaging techniques, the team discovered that Bt spores and toxin crystals are embedded in a dense mesh of protein fibers just eight nanometers wide. These fibers form a highly organized, double-helical structure and are chemically crosslinked into an exceptionally stable material. The fibers assemble themselves and remain intact under extreme conditions, including heat, drought, harsh chemicals, and mechanical stress.

“This is one of the most robust protein materials we’ve seen in nature,” says Prof. Han Remaut, senior author of the study.

Keeping toxins and spores together

“The sporesilk acts as a molecular net that clusters the spores and toxin crystals into compact ‘infection units’,” says Dr. Mike Sleutel (VIB-VUB). “So, when insect larvae ingest the bacteria, they receive both the infectious spores and the toxic payload at the same time.”

When the researchers removed the gene responsible for these fibers, the clusters fell apart. As a result, the bacteria became less effective at killing insect larvae, with delayed mortality observed in experimental models.

Conversely, adding the fibers, either through genetic engineering or by simply mixing in purified fibers, restored spore – toxin clustering and significantly increased insect-killing efficiency.

“This could offer a practical way to develop more potent and reliable biopesticides while maintaining regulatory and environmental safety standards,” says Remaut.

The study also hints at broader applications. Because of their extreme durability and self-assembling nature, these protein fibers may inspire new biomaterials for use in biotechnology and engineering.

As agriculture seeks more sustainable solutions, understanding and harnessing natural systems like these could play a key role in reducing reliance on chemical pesticides.

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Journal

Nature Communications

DOI

10.1038/s41467-026-70495-z 

Method of Research

Experimental study

Subject of Research

Cells

Article Title

Auto-crosslinking sporesilk fibers promote endospore and Cry toxin clustering

Article Publication Date

11-Mar-2026

 

Researchers unravel a copper-based ’sensor’ that underpins signal detection in plants

Breakthrough reveals a new way plants perceive hydrogen peroxide, offering new insights for crop protection and plant immunity

Nagoya University

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Researchers have uncovered a previously unknown mechanism by which plants detect hydrogen peroxide (H₂O₂), a key signaling molecule involved in stress responses and immunity.

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Credit: Issey Takahashi

Researchers at the Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, together with collaborators from RIKEN Center for Sustainable Resource Science (RIKEN CSRS) and The University of Osaka, have uncovered a previously unknown mechanism by which plants detect hydrogen peroxide (H₂O₂), a key signaling molecule involved in stress responses and immunity. Published in Nature Communications, the study reveals that plants rely on a copper-dependent sensing system, rather than the previously assumed cysteine-based mechanism, to perceive reactive oxygen species (ROS).

This work reshapes our understanding of how plants respond to environmental stress and pathogens, and may pave the way for improving crop resilience. Quinones and hydrogen peroxide play a central role in plant responses to pathogens and environmental stress, and understanding how plants perceive these molecules could inform strategies to enhance crop protection and stress tolerance.  

How plants detect redox-related molecules in their environment

As sessile organisms, plants constantly monitor their environment using specialized receptors on the surface of their cells. Among these, a class known as leucine-rich repeat receptor-like kinases can sense a wide range of stimuli. One such receptor, CARD1 (also called HPCA1), was previously shown to detect both quinones and ROS such as H₂O₂. However, how a single receptor distinguishes between these chemically distinct signals remained unclear.

The research team discovered that CARD1 contains a copper ion bound to a cluster of histidine residues on its surface. This copper site plays a critical role in detecting H₂O₂.

Surprisingly, cysteine residues — previously thought to be essential for H2O2 sensing — are not required for signal perception. Instead, the CARD1 receptor uses copper to detect H₂O₂ through redox chemistry.

“The results showed that when the copper-binding site is disrupted, plants lose their ability to respond to H₂O₂ signals,” said Anuphon Laohavisit, lead author and designated associate professor at the WPI-ITbM. “In contrast, mutations in cysteine residues had little effect on signaling, indicating that their primary role is structural rather than signaling.”

Through computational approaches, the team suggests that ROS sensing by CARD1 could occur through oxidation of copper (Cu⁺ to Cu²⁺) at the receptor surface. Such a redox change may either directly trigger signaling or generate secondary molecules that activate downstream responses. It is likely that a separate pathway exists for quinone perception and remains to be identified.

Conclusion and future perspective

The researchers provide the first structural evidence of a metal ion–based sensing mechanism in plant plasma membrane receptors, reshaping our understanding of ROS perception in plants and paving the way for exploring metal-based ROS signaling mechanisms across biology.

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Journal

Nature Communications

DOI

10.1038/s41467-026-72573-8 

Method of Research

Experimental study

Subject of Research

Not applicable

Article Title

A copper-dependent, redox-based hydrogen peroxide perception in plants

Article Publication Date

18-May-2026

 

How school songs shape children's environmental awareness: Lessons from Japan

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Distribution map of elementary and junior high schools in Hachioji City, and those that responded to the questionnaire.

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Credit: Miyauchi and Osawa, 2026

The natural environment provides human society with essential non-material values, such as cultural symbolism and local attachment, known as "cultural ecosystem services." But can these abstract cultural values actually influence how communities behave? According to a new study focusing on public schools in Hachioji City, Tokyo, the answer is yes.

In a study published in the journal Nature Conservation, researchers Kazuki Miyauchi and Associate Professor Takeshi Osawa from the Graduate School of Urban Environmental Sciences at Tokyo Metropolitan University investigated the relationship between nature-related vocabulary in school anthems and actual environmental education practices.

Why school songs?

Lyrics serve as a vital medium for expressing nature within a cultural context. However, because popular or general songs are sung in many different places, their references to nature tend to be abstract and often lack a strong connection to a specific region. In contrast, school anthems are deeply rooted in specific schools and communities and are characterized by being sung regularly and repeatedly. Consequently, how local nature is depicted in school anthems can provide insightful clues into the relationship between the school, the community, and the environment

What the data showed

Researchers analyzed the official anthems of all 104 public schools in Hachioji City, Tokyo - where the surrounding mountains and iconic Mt. Takao serve as powerful natural symbols - surveying them simultaneously about nature-based programs and use of local green spaces. Of the 63 schools that provided valid responses, a clear pattern emerged.

Surprisingly, anthems referencing “高尾” (Mt. Takao) by name showed no significant correlation with nature-related programs, nor did lyrics correlate with broader outdoor school programs involving overnight trips to distant locations. But schools whose anthems included general mountain terms - such as “山” (mountain) or “峰” (peak) - showed a statistically significant tendency to utilize nearby green spaces for educational activities.

"This finding suggests a potential link between symbolic cultural representations embedded in school traditions and the actual practice of nature-related education."

- the researchers note in the study.

Research Significance and Potential Impact

This research is highly significant because it demonstrates that natural expressions embedded in school culture - specifically through school anthems - may be linked to concrete actions in actual educational activities.

“It is well-established that childhood experiences in nature exert a strong influence on a person's future environmental awareness. The fact that local nature "lives" within school culture via anthems and correlates with outdoor curriculum suggests that embedding local ecology into cultural traditions can be a catalyst for children to learn to value their immediate surroundings.”

- the researchers explain.

While the study establishes a strong correlation, its scope was limited to mountain-related terms. The researchers point out that future studies should explore other natural elements, such as rivers, forests, and wildlife. The researchers also note that further investigation is needed to determine causality - whether the expressions in the anthems directly influence educational activities, or whether a region's overall pro-nature orientation is simply reflected in both the community's lyrics and its curriculum.

By expanding on these findings, we expect to provide new insights into how environmental education and regional development can leverage the powerful connection between culture and nature.

Original source:

Miyauchi K, Osawa T (2026) Are cultural ecosystem services expressed in school songs associated with nature-related educational activities? Nature Conservation 63: 237-245. https://doi.org/10.3897/natureconservation.63.180492

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Journal

Nature Conservation

DOI

10.3897/natureconservation.63.180492 

Article Title

Are cultural ecosystem services expressed in school songs associated with nature-related educational activities?

SCIENCE TUESDAY