Home›Glossary›FGlossaryfrenumA connecting or restraining membrane, such as that connecting the tongue to the base of the mouth.Used in 17 species profilesRhinogobius candidianusRhinogobius chiengmaiensisRhinogobius filamentosusRhinogobius flumineusRhinogobius formosanusRhinogobius gigasAll 17 →