May 19, 2025
Blyth's river frog (Limnonectes blythii) By: Robert F. Inger From: Living Amphibians of the World 1966
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Blyth's river frog (Limnonectes blythii) By: Robert F. Inger From: Living Amphibians of the World 1966
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Hello Mark! I found out about the limnonectes genus recently - why are some of them knobheads? What is the purpose of knob?
The structure is called a caruncle, which sounds like a made-up word, but then again, all words are made up. It is made of connective tissue underneath skin full of mucous glands (studied histologically by Lambertz et al. 2014), but its function is unknown. However, because it is only present in males, I have a well-founded suspicion that it is involved in sexual selection one way or another. I would guess that it is either (a) very intimidating for other males, (b) actually helpful in physical contests among males, (c) very attractive to females, or (d) some combination of the above.
The Luzon fanged frog [Limnonectes macrocephalus] is a medium-sized frog endemic to the Philippines. While the function of the “fangs” [not teeth but rather jaw protrusions] is not currently known, it’s possible that they use them to help catch prey in fast-moving water, as they have been observed feeding on fish and tadpoles. The Luzon fanged frog is not the only species of frog found to have this trait; during a 2011 expedition to Sulawesi scientists encountered 13 different “fanged frogs”, 9 of which are believed to be new to science.
Images by Rafe M. Brown; you can read more about the discovery here.
1.5-2 inches fanged frog gives birth to tadpoles without laying eggs
1.5-2 inches fanged frog gives birth to tadpoles without laying eggs
NEW YORK: In the depths of an Indonesian rainforest, scientists have identified a fanged amphibian that is the first known frog that gives birth to tadpoles, instead of laying spawn. The newly named frog was found in small puddles and side streams in a rainforest in Sulawesi Island in Indonesia. It’s a small animal, about 1.5 to 2 inches long. In a paper in PLOS One describing the tadpole-bearing…
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(fNationalGeographic) Fanged-Frog: 9 New Species Found
Sulawesi fanged frog species (pictured, a new species, tentatively namedLimnonectes species I) also vary widely in terms of size.
Some are the size of a human thumb, while others, like Limnonectes species I, are much larger.
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