Dictionary of Ichthyology  

transverse lingual lamina = a cusp found on the tongue of lampreys (Petromyzontidae). These laminae consist of an anterior or transverse lamina.

Petromyzon marinus disc, St-Vallier, Fleuve St-Laurent, Québec, CMNFI 1995-0022, 4.7 cm wide without fimbriae. Photograph by Brian W. Coad, image manipulation by Noel Alfonso.

©Canadian Museum of Nature