Family Amphioxidae refers to a group of marine animals commonly known as lancelets. These small, fish-like creatures are characterized by their long, slender bodies and lack of true jaws or paired fins. Other synonyms for the family include Branchiostomidae and Amphioxida. Lancelets are an important evolutionary link between invertebrates and vertebrates and play a significant role in the ecology of many marine ecosystems. Despite their simple appearance, they possess a number of unique adaptations that allow them to thrive in a variety of habitats. Overall, the Family Amphioxidae is an interesting and important group of animals that continue to fascinate scientists and nature enthusiasts alike.