How do leeches and lampreys breathe while feeding?

So they breathe with the entire surface of their body. For example, leeches are classified as a subclass of annelids. Today, about five hundred species of these creatures are known on our planet. Only sixty-two species can be found on the territory of our country. It is also worth knowing that the body length of leeches can be up to forty-five centimeters. But lampreys are ranked among the jawless group. Lampreys can be up to one hundred centimeters long.