Description
Orthacanthus Shark
- Orthacanthus
- Dermal Denticle
- Permian Age
- Ryan Formation
- Waurika, Oklahoma
- This Dermal Denticle measures 2.3mm long and will come in a 1.25″ Gem Jar
- MORE Fossil Sharkteeth for Sale
Orthacanthus belongs to an extinct group of ancient sharks called xenacanthids. Xenacanthid teeth are usually tricuspid, hence they have three cusps on their crown. In this case, the two outer cusps are the largest. At the same time they may be spike-like or gently curving.
Dermal denticles (placoid scales) are tough “scales” that cover the skin of sharks and rays. In spite of looking similar to scales, they are actually just modified teeth and are covered with hard enamel.
By Nobu Tamura
