- Acrodont; tongue broad and thick, not protractile; no osteoderms. Old World.
- Pleurodont; tongue broad and thick, not protractile; no osteoderms. America, Madagascar and Fiji Islands.
- Pleurodont; tongue short, villose, scarcely protractile, feebly nicked at the tip. With osteoderms at least upon the skull, where they roof in the temporal region.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.