A frog does not officially exist to science until someone proves it, call by call and gene by gene. Near Peru's Cordillera Azul National Park, it took FIU biologist Alessandro Catenazzi and his collaborators years of fieldwork to confirm that four small, ground-dwelling frogs collected in the region belonged to no species yet named.

  • 4 new Oreobates frog species formally described
  • 31 species now known in the genus Oreobates, up from 27
  • 55+ frog species Catenazzi has helped describe over his career
  • Specimens collected near Cordillera Azul National Park, Peru

Racing bulldozers to document life

The frogs were gathered during surveys in forest near the park, land under pressure from clearing and development. Catenazzi, a researcher in FIU's Institute of Environment, has spent his career racing to document amphibian diversity before habitat disappears.

"Each species is its own world," Catenazzi said. "We derive a lot from nature — even drugs, even food. I can't tell you specifically what the value of these four species is yet, but there could be a cure for cancer there."

"The first step of anything you want to do in biology is to name the organism," Catenazzi said.

That naming is far from a formality. The research, published in the journal Diversity, combined morphology, acoustic recordings and genetic sequencing to separate the new frogs from close relatives that had already been described, some of them more than a century ago.

How you prove a frog is new

Confirming a new species starts with knowing what has already been named — a surprisingly difficult task. Type specimens from 19th- and 20th-century descriptions are scattered across museums in London, New York and the Smithsonian, and researchers sometimes have to travel to examine them directly.

From there, the team compared physical traits between the Peruvian specimens and known Oreobates frogs: skin texture, coloring, the presence or absence of small tubercles. Frogs that look nearly identical can still be different species, so Catenazzi's team also recorded and analyzed mating calls.

"Females are not going to be attracted to a call that does not come from their own species," Catenazzi said, explaining why call differences are such a reliable signal.

Genetic sequencing supplied the final piece of evidence. By comparing specific, already-sequenced DNA regions against other frog species, the researchers reconstructed an evolutionary family tree and confirmed the four Peruvian frogs sat on their own distinct branches. Read more about the FIU Institute of Environment's role in the discovery.

Why naming a species matters

Beyond the taxonomy, Catenazzi's lab has already found practical value in frog biology: two other species it studies produce peptides with antimicrobial, wound-healing and antifungal properties. Those discoveries are part of why he argues that frogs can help justify protecting the habitat they depend on.

Oreobates frogs are small and easy to overlook, living on the forest floor rather than in the trees where more conspicuous species are found. But each confirmed species adds to the case for safeguarding the forest around Cordillera Azul, one of Peru's most biologically rich and least-disturbed protected areas.

For Catenazzi, the four new frogs are also a reminder of how much remains undiscovered in places still being surveyed for the first time. Every new name on the list is one more reason to keep looking before the forest changes.