Shark and ray teeth consist of two basic parts, crown and root. No single tooth possesses all the features defined by the following terms.
- Barb: Hook-like, enameloid-covered crown prominence situated on the posterior border of rostral teeth of some fossil and recent sawfishes and sawsharks.
- Basal ledge: Ledge formed by expansion of the crown foot above the root.
- Blade: Modification of the crown always mesial or distal to a cusp or cusplet(s) bearing a cutting ridge along its apical surface.