The correct answer is option 3, Ichthyophis. Ichthyophis is a type of limbless amphibian known as a caecilian. Unlike most amphibians, caecilians lack a tongue. Instead, they have a specialized organ called a tentacle, which helps them catch prey and sense their surroundings. The tentacle is located on the upper jaw and is used to detect vibrations and chemical signals in the environment. Caecilians are primarily burrowers and feed on small invertebrates, using their tentacle to locate and capture prey. It`s important to note that while some amphibians like frogs and salamanders have tongues, there are exceptions like the caecilian, which does not have a tongue.