👉 Eusphinctinids are a group of small, specialized muscles that are found in the digestive tract and other organs within animals, primarily insects and some mammals. They play crucial roles in digestion by assisting with muscle contractions to chew through food particles. The term "eusphinctinae" is derived from Greek words meaning "small," as these muscles are typically found at smaller scales than larger ones and thus are less visible to the naked eye.