n. plDerotremata(Zoöl) The tribe of aquatic Amphibia which includes Amphiuma, Menopoma, etc. They have permanent gill openings, but no external gills; -- called also Cryptobranchiata.
Century Dictionary and Cyclopedia
derotremataA group of urodele batrachians. They have no external gill-tufts, but usually gill-slits or branchial apertures. The maxillary and vomerine teeth are in single series. The group is distinguished on the one hand from Siren, Proteus, and Necturus, and on the other from the salamandrines proper. It consists of the genera Amphiuma, Cryptobranchus, and Megalobatrachus, and corresponds to the families Cryptobranchidæ and Amphiumidæ. Also Derotrema.