A rare insect resembling a bumblebee, known as Pocota personata, has made an unexpected return to France after a hiatus of 150 years. This remarkable sighting, reported in the Paris region in 2025, has sparked a flurry of questions among scientists about the insect’s historical presence and its sudden reappearance in the country.
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Researchers are left pondering whether the Pocota personata had genuinely vanished from the French ecosystem over the past century and a half or if it had been present but unobserved. The mystery surrounding this insect highlights the significant gaps in scientific knowledge concerning biodiversity, even as experts are actively engaged in addressing the pressing decline in species numbers.
Rodolphe Rougerie, a lead investigator with the French biodiversity initiative, Dynabiod, emphasised the difficulties faced by scientists in quantifying biodiversity loss. “We know biodiversity is declining, but we are sometimes quite helpless when it comes to quantifying it due to a critical lack of data on the current and past monitoring of species,” he explained in a statement reported by AFP.
Launched in June by France’s National Museum of Natural History and the National Centre for Scientific Research, the Dynabiod project aims to create a comprehensive database of the country’s plants and invertebrates. As part of this effort, entomologists are meticulously collecting and examining insects across various sites in France to ensure that no species go unnoticed.
At the Jardin des Plantes botanical garden in Paris, researcher Fanny Kratz regularly inspects large white insect traps at the facility and 16 other selected locations. Kratz described the work as “very, very long” and “very, very complicated,” noting that a single trap could yield hundreds of distinct DNA traces. Alarmingly, many of these samples do not match existing entries in scientific databases, leaving researchers at a loss when trying to identify what they have collected.
“Ideally, we need reference databases that are rich enough to enable effective fieldwork and genetic identification,” Kratz remarked, highlighting the challenges associated with current biological research efforts. Additionally, while researchers rely heavily on contributions from amateur naturalists and the general public to report species sightings, these observations are often limited to areas that are easily accessible. Consequently, it is difficult to ascertain if a particular species has genuinely disappeared or merely gone unrecorded.
This challenge is not unique to France; scientists worldwide are grappling with the intricate task of cataloguing and evaluating numerous species, which complicates efforts to gauge the alarming rate of biodiversity change globally. The unexplained 150-year hiatus of Pocota personata in the scientific record serves as a poignant reminder that the absence of sightings does not imply extinction.
The urgency of these investigations continues to grow, as scientists emphasize that without comprehensive records, identifying species in need of protection becomes exceedingly difficult. “If we don’t have the reference database, we’re stuck,” Kratz cautioned, underscoring the necessity for robust scientific frameworks to assist in conservation efforts.
Overall, the reappearance of Pocota personata not only invites speculation about this particular insect’s past but also underscores the broader complexities of biodiversity research. As knowledge gaps remain prevalent, the findings from ongoing projects like Dynabiod will be crucial for enhancing understanding of our natural world and for the conservation of its many hidden wonders.