- An order of tailless amphibians having a slender, wormlike human anatomy with regular annulations, and in most cases with minute machines imbedded inside epidermis. The limbs are standard or lacking. It includes the cæcilians. Called in addition Gymnophiona and Ophidobatrachia.
- An order of limbless serpentiform amphibians, represented by the family Cæciliidæ; the cæcilians: contrasted with Ichthyomorpha. Also called Apoda, Batrachophidia, Gymnophiona, Ophiosoma, Ophidobatrachia, Pseudophidia, and Peromela.