The new species is called Limnonectes beloncioi, with the common name Mindoro Fanged Frog in honor of Mindoro Island where it lives.
It was a 100-year-long case of mistaken identity. The frogs looked just like a species of fanged frog (Acanth's Fanged Frog) found on another island, but the researchers discovered the Mindoro critters had a different mating call.
Genetic analysis confirmed the two species are related, but distinct. The scientists estimate they've been separated from each other for 2 million to 6 million years.
The Mindoro frogs live in streams and sport hidden fangs inside their mouths. Herr said the fangs are likely used for combat over mating sites and to fight off predators.
The study shows you can't judge a frog by its (or its fangs).