Lungless salamanders develop lungs as embryos despite lung loss in adults for millions of years

Lungs are essential to many vertebrates including humans. However, four living amphibian clades have independently eliminated pulmonary respiration and lack lungs, breathing primarily through their wet skin. Little is known of the developmental basis of lung loss in these clades.

from Phys.org - latest science and technology news stories https://ift.tt/dAie5XV