Siphlonuridae, also known as the primitive minnow mayfly is a family of insects belonging to the order Ephemeroptera. Taxonomy The family is divided into the following genera: Genus: Edmundsius Genus: Parameletus Genus: Siphlonisca Genus: Siphlonurus Family Overview The labrum (upper lip) is not notched in the middle; the antennae are shorter than twice the width of the head; the maxillae on the underside of the head lack prominent rows of golden spines; the abdominal gills are rounded and similar to each other in structure; 3 long slender filaments at the end of the body are about equally long. References Mayflies Insect families