A team of researchers led by the New Jersey Institute of Technology (NJIT) has made a groundbreaking discovery in the field of entomology. A 16-million-year-old amber fossil, found in the Dominican Republic, has revealed the smallest predator ant ever discovered. The fossil, named Basiceros enana, belongs to the Basiceros genus of dirt ants, which are known for their remarkable ability to camouflage themselves in soil and leaf litter using specialized hairs on their bodies.

Until now, these ants had only been found in the neotropical rainforests stretching from Costa Rica to Southern Brazil. However, this ancient fossil suggests that they once inhabited the Caribbean islands as well. The discovery raises new questions about how these ants reached their present-day habitats and why they ultimately went extinct in the region.

The researchers applied advanced imaging techniques at NJIT and Japan’s Okinawa Institute of Science and Technology Graduate University to capture the fossil in exquisite detail. By comparing the specimen’s physical characteristics with those of all known modern dirt ant species, they conducted molecular dating analyses to trace its evolutionary lineage.

Measuring just 5.13 millimeters long, Basiceros enana is significantly smaller than its modern relatives, which can reach nearly 9 millimeters in length. This finding flips previous hypotheses that these ants were ancestrally large and shrank over time. Instead, it suggests that they almost doubled in size over the course of 20 million years.

The fossil also preserves other distinctive morphological characteristics, such as an upturned propodeal spine, a trapezoid-like head structure, and predatory features like mandibles with 12 triangular teeth. These adaptations, including two layers of specialized hairs for adhering soil particles against their bodies, suggest that the ancient Caribbean dirt ants employed the same strategies to avoid predators and prey that modern Basiceros ants use today.

Despite these remarkable findings, the researchers note that the extinction of these ancient ants in the region remains a mystery. They propose that it may have been due to a loss of available niches or interspecific competition, highlighting the importance of understanding what drives local extinctions to mitigate modern human-driven extinction and protect biodiversity.

The discovery by scientists at the University of Leicester has revealed that jewel wasps can undergo a natural “time-out” as larvae before emerging into adulthood with this surprising advantage. The study, published in PNAS, shows that this pause in development within the wasp dramatically extends lifespan and decelerates the ticking of the so-called “epigenetic clock” that marks molecular aging.

Aging isn’t just about counting birthdays; it’s also a biological process that leaves molecular fingerprints on our DNA. One of the most accurate markers of this process is the epigenetic clock, which tracks chemical changes in DNA, known as methylation, that accumulate with age. The study found that by altering the course of development itself, the jewel wasps could slow down their aging process at a molecular level.

To investigate this phenomenon, a team of researchers exposed jewel wasp mothers to cold and darkness, triggering a hibernation-like state in their babies called diapause. This natural “pause button” extended the offsprings’ adult lifespan by over a third. Even more remarkably, the wasps that had gone through diapause aged 29% more slowly at the molecular level than their counterparts.

“It’s like the wasps who took a break early in life came back with extra time in the bank,” said Evolutionary Biology Professor Eamonn Mallon, senior author on the study. “It shows that aging isn’t set in stone; it can be slowed by the environment, even before adulthood begins.”

The researchers found that this molecular slowdown was linked to changes in key biological pathways that are conserved across species, including those involved in insulin and nutrient sensing. These same pathways are being targeted by anti-aging interventions in humans.

What makes this study novel and surprising is that it demonstrates a long-lasting, environmentally triggered slowdown of aging in a system that’s both simple and relevant to human biology. It offers compelling evidence that early life events can leave lasting marks not just on health but on the pace of biological aging itself.

Understanding how and why aging happens is a major scientific challenge. This study opens up new avenues for research, not just into the biology of wasps, but into the broader question of whether we might one day design interventions to slow aging at its molecular roots. With its genetic tools, measurable aging markers, and clear link between development and lifespan, Nasonia vitripennis is now a rising star in aging research.

“In short, this tiny wasp may hold big answers to how we can press pause on aging,” concluded Professor Mallon. Funding for the study was provided by The Leverhulme Trust and The Biotechnology and Biological Sciences Research Council (BBSRC).

The study of giant carnivorous dinosaurs has long been a source of fascination for scientists. A recent analysis of 18 species of predatory dinosaurs reveals that while some giants like the Tyrannosaurus rex were optimized for crushing prey, others, such as spinosaurs and allosaurs, had weaker bites and specialized in slashing and ripping flesh.

The findings, published in the journal Current Biology, demonstrate that meat-eating dinosaurs followed different evolutionary paths in terms of skull design and feeding style despite their similarly gigantic sizes. According to Dr. Andrew Rowe, a researcher at the University of Bristol, “Carnivorous dinosaurs took very different paths as they evolved into giants in terms of feeding biomechanics and possible behaviors.”

The research involved analyzing 3D scans of dinosaur skulls using CT technology and surface scanning. The scientists quantified the feeding performance and measured the bite strength across various species. They were surprised to find clear biomechanical divergence, with some dinosaurs having skulls that were optimized for high bite forces at the cost of higher skull stress.

In contrast, other giants like Giganotosaurus had relatively lighter bites. The findings show that being a predatory biped didn’t always equate to being a bone-crushing giant. Unlike T. rex, some dinosaurs, including spinosaurs and allosaurs, became giants while maintaining weaker bites more suited for slashing at prey and stripping flesh.

Dr. Rowe compares the feeding style of Allosaurus to that of a modern Komodo dragon, highlighting the diversity of dinosaur ecosystems and the specialization of different predators. The research was supported by funding from the Biotechnology and Biological Sciences Research Council.

The study provides new insights into the evolution of giant carnivorous dinosaurs and their feeding behaviors, offering a more nuanced understanding of these fascinating creatures.