This is a fish mouthplate from a drum type fish - exact species unknown. These have a characteristic "bunch of grapes" look to them. Some can be quite large and others are very small. This is a small example. It was recovered from the Peace River, Bone Valley formation, Hawthorn Group, Florida.
Refer to the photos. The black centimeter cube is shown for scale and is not included. You are purchasing the specimen shown. Your purchase will include a labeled gemjar for safe storage.