This view has originated out of the very remarkable superficial resemblance between the Ichthyophis-larva and the Amphiuma.
Sarasin (17), whose great work on the development of Ichthyophis is one of the most important recent contributions to our knowledge of the batrachians, Amphiuma is a sort of neotenic Caecilian, a larval form become sexually mature while retaining the branchial respiration.
Eggs protected by the parents who coil themselves round or "sit" on them.-Mantophryne, Desmognathus, Autodax, Plethodon, Cryptobranchus, Amphiuma, Ichthyophis, Hypogeophis, Siphonops.