"When I started this project twelve years ago, we already knew there were several species waiting to be described, and almost every expedition to Madagascar revealed another one," Scherz said. "Untangling that puzzle took years."

The breakthrough came from museomics — DNA sequencing applied to historical museum specimens. The team compared genetic material from old collections, including the original type specimens that define species names, with DNA from newly collected frogs. They also examined external features, skeletal anatomy, and frog calls.

Together, these lines of evidence let the researchers attach historical names to the correct evolutionary lineages and clear up taxonomic confusion that had persisted for decades.

"Museum collections are far more than archives of the past — they are essential scientific resources for understanding biodiversity today," said Dr. Alice Petzold of the University of Potsdam, who led the museomics work. "By sequencing historical specimens, including the original type specimens, we were able to answer questions that have persisted for generations."

What does this mean for conservation?

Knowing which species exist, and where they live, is the foundation of biodiversity measurement and protection. That matters in Madagascar, where deforestation is rapidly fragmenting the forests these frogs call home.

Scientists still know remarkably little about many of these animals. "For many species, we still know almost nothing about their breeding biology, population sizes or ecological requirements," said co-author Dr. Andolalao Rakotoarison of the Institut d'Enseignement Supérieur de Soavinandriana Itasy in Madagascar. "Without that knowledge, it becomes much more difficult to assess their conservation status and protect them effectively."

The findings are already feeding into policy. At a protected-area planning workshop in March 2026, held under Madagascar's Biodiversity 30x30 Program, several of the newly described frogs — including Rhombophryne quentini — directly informed proposals to strengthen and expand protected areas.

The study itself grew from close cooperation among scientists and institutions in Madagascar and Europe.

Are more frogs still waiting to be found?

Almost certainly, the researchers say. Even with seven additions, they believe unnamed species remain undiscovered and undescribed across the island.

Scherz frames the new work as a beginning rather than an ending. "Every newly described species represents millions of years of unique evolutionary history," he said. "The more we learn about Madagascar's remarkable amphibians, the clearer it becomes that there is still an enormous amount left to discover."

The team's findings carry one clear caveat: seven new species described does not mean seven species fully understood. Basic biology — breeding, population sizes, ecological needs — remains unknown for many of them, and the researchers stress that effective protection depends on filling those gaps.