Ringed servage — legless amphibians, leading underground way of life — were the owners of a poisonous teeth. Having studied the anatomy of this species, the researchers found in both jaws of the poisonous glands on the teeth. Similar structures were identified in other species cermag. As noted by the authors in an article for the journal iScience, this feature may be an adaptation of legless amphibians to hunt invertebrates and small vertebrates. Perhaps she appeared in the first stages of the evolution of the group, more than two hundred million years ago.
In the evolution of many amphibians acquired skin glands that produce venom. A number of species of frogs and newts it’s so strong that can easily kill a man. However, this powerful weapon is not for hunting, like the snakes, and for protection from predators. For with the exception of two species of tree frogs, amphibians even have special structures for injection of venom into the body of the attacker.
Some legless amphibians (Gymnophiona) that resemble earthworms, and are underground or aquatic life in tropical regions of the world, can also develop protective poisons. Unfortunately, this aspect of their biology, as many others, little is known. All in exceptional stealth of these creatures: to find at least one individual is required to spend from four to twenty hours.
A team of herpetologists led by Carlos Zaredom (Carlos Jared) from the Brazilian Instituto Butantan decided to carefully study the anatomy of one species of legless amphibians — ringed servage (Siphonops annulatus), which lives in South America. Primarily they were interested in the structure of the oral cavity.