Genus Gymnelis is a group of species of small, freshwater fish that are commonly known as Sand Darters. These fish are slender and elongated, with flattened heads and bodies that are covered in small scales. Gymnelis are generally found in rivers and streams across North America, where they feed on small aquatic invertebrates and insects. Some possible synonyms for the genus Gymnelis include the sand darter genus, the mottled sand darter genus, and the slender sand darter genus. These names all refer to the distinctive appearance and habitat preferences of these fish, which have made them popular among researchers and aquatic enthusiasts alike.