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In page Amphiuma:

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Amphiuma possess relatively ancestral forms of lungs compared to some of the other groups of salamanders that live terrestrially today.[1][2] Their lungs are long organs, extending over half of the body length, with dense capillary networks and large surface area that suggest the utilization of the entire lung for respiration while the animal is in water or on land.[2] Although it is common for amphibia to respire out of their skin, also known as cutaneous respiration, it was found that amphiuma primarily respirate through their lungs, despite their aquatic lifestyle.[3] This is suggested by the high lung to respiratory capillary density compared to the relatively low skin to respiratory capillary density.[2][3]