New skeleton frog from Madagascar is already critically endangered

New skeleton frog from Madagascar is already critically endangered

Sometimes all it takes is fewer clicks. Scientists have discovered a new species of frog from Madagascar that stuck out in part because it “clicked” less during calls than similar species. Unfortunately the scientists believe the new species—dubbed the Ankarafa skeleton frog (Boophis ankarafensis)—is regulated to a single patch of forest, which, despite protected status, remains hugely threatened.

The Ankarafa skeleton frog. The frogs are called ‘skeleton’ because of their semi-transparent skins. Photo by: Gonçalo M. Rosa.

“All individuals were detected from the banks of two streams in Ankarafa Forest,” the researchers write in the paper, adding that “despite its conspicuous call, it has not been detected from other surveys of northwest Madagascar and it is likely to be a local endemic to the peninsula.”

Ankarafa skeleton frog’s (Boophis ankarafensis) mating. Photo by: Gonçalo M. Rosa.

Endemic means it is found in a single location. In this case, all Boophis frogs, commonly called skeleton frogs due to their somewhat see-through skin, are only found in Madagascar and the nearby Comoros Islands. But Ankarafa skeleton frog appears to be only found in the forest it is named after.

Although similar looking to another species Boophis bottae, the scientists found that the Ankarafa skeleton frog sang with a faster pulse and usually clicked twice rather than three times. Frog songs are highly linked to species differentiation as they are used to help individuals tell different species apart. Ankarafa skeleton frog’s distinctness was further proved by genetic testing, which found significant difference between it and other Boophis species.

Yet, the Ankarafa skeleton frog’s future is by no means secure.

“The frog was only found within intact forest and appears sensitive to anthropogenic disturbance,” the researcher’s write adding that “despite its protected status, Ankarafa is experiencing widespread deforestation, furthermore much of this destruction is concentrated on the streamside forests which this species relies upon.”

The Ankarafa skeleton frog is believed to be Critically Endangered. Photo by: Gonçalo M. Rosa.

The forest is threatened by slash-and-burn agriculture, logging, and burning of adjacent grasslands—in fact the researchers warn that a single, big fire could potentially wipe-out the species entirely.

Given this, the researchers suggest that the species be listed as Critically Endangered by the IUCN Red List.

“A halt to all forest destruction and agricultural practices within the park must occur immediately to stop any further decline of Sahamalaza’s endemic amphibian fauna, or risk their possible extinction within the near future,” the researchers recommend.

There are 70 known species of frogs in the Boophis genus currently, but new ones are increasingly popping up as herpetologists—those who study amphibians and reptiles—undertake increased surveys across Madagascar.

Amphibians are among the most imperiled groups on the planet currently. They have been hugely hit by habitat loss, deforestation, water pollution, and on top of all that a killer infectious disease, chytridiomycosis, which is caused by a fungus. Currently, the IUCN Red List estimates that just over 40 percent of the world’s amphibians are threatened with extinction.


  • Penny SG, Andreone F, Crottini A, Holderied MW, Rakotozafy LS, Schwitzer C, Rosa GM (2014) A new species of the Boophis rappiodes group (Anura, Mantellidae) from the Sahamalaza Peninsula, northwest Madagascar, with acoustic monitoring of its nocturnal calling activity. ZooKeys 435: 111–132. doi: 10.3897/zookeys.435.7383

This article was written by Jeremy Hance for

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