List the general features of the structure of tailless amphibians.

As the name suggests, the body of such amphibians is devoid of a tail, it is short, wide, with smooth transitions between the head and body. There is a large mouth opening on the head, above it, on the elevations, there are nostrils and eyes, behind which is the eardrum. The skin is naked and contains a large number of glands, in some it is smooth, in others with tubercles formed by the accumulation of these glands. A number of species have venom glands. The size and colors are varied. The front pair of limbs is much longer than the back one, movement by jumping, or by jolts of the hind limbs in the water.